Potassium Permanganate Solution Research Articles

Seeding Layer Effect on the Microstructure of Hydrothermally Grown α‐Manganese Dioxide Nanowires on Three‐Dimensional Graphene Foam

AbstractHydrothermal synthesis is a straightforward approach for producing high‐yield manganese dioxide (MnO2) nanostructures with efficient morphological control at low temperatures. This study investigates the microstructural dependency of hydrothermally grown α‐MnO2 nanowires (NWs) on pre‐treatment conditions on the substrate surface. Within this scope, α‐MnO2 NWs were synthesized on chemical vapor deposition (CVD)‐based graphene foam (GF) substrates pre‐treated via potassium permanganate (KMnO4) solution as a seeding layer with different concentrations (0.025, 0.050, 0.075, 0.1 M). A direct α‐MnO2 NWs growth (without pre‐treatment) was also performed on GF by hydrothermal method. The seeding layer effect on the NWs growth was elaborated to comprehend the process‐structure correlations by characterizing the resultant graphene foam/α‐MnO2 nanowires (GF/α‐MnO2 NWs) nanocomposites through Scanning Electron Microscopy (SEM), Raman Spectroscopy, X‐Ray Diffraction (XRD), and X‐Ray Photoelectron Spectroscopy (XPS). SEM, XRD, and Raman Spectroscopy revealed the successful acquisition of highly crystalline α‐MnO2 in one‐dimensional nanowire morphology on the high‐quality GF. Moreover, XPS results confirmed that all nanocomposites comprise α‐MnO2 and graphene without chemical degradation. Consequently, slight changes in solution concentration of seeding layers caused a noticeable alteration in the nanowire's structure, which could ensure effective control of nanocomposite properties without sacrificing the high purity of each component.

Optimal Design of a Binder-Free Manganese/Cobalt Bilayer Bifunctional Catalyst for Rechargeable Zinc–Air Batteries

We have developed a bilayer film comprising cobalt oxyhydroxide (CoOOH) underlayer and manganese dioxide (MnO2) upper layer, which are active toward oxygen evolution reaction (OER) and oxygen reduction reaction (ORR), respectively. The bilayer bifunctional catalyst is synthesized by electrodepositing cobalt hydroxide (Co(OH)2) on a porous carbon paper (CP) and subsequently immersing the obtained Co(OH)2/CP in a potassium permanganate (KMnO4) solution without binders or conductive additives. Specifically, electron transfer between the already-deposited Co(OH)2 and MnO4 – proceeded in the solution, yielding MnO2, until all the Co ions become trivalent, after which self-terminates. The proposed method only allows for the construction of the minimum required bifunctional catalyst only at the reaction site of the gas-diffusion electrode, i.e., at the so-called three-phase interface, thus remarkably increasing catalyst utilization while improving reactant and product diffusions. The developed catalyst shows stable MnO2/CoOOH cycles at |20| mA cm–2 with a minimal difference (0.764 V) between the OER and ORR potentials, reflecting the structural advantage of the proposed catalyst. This work proposes efficient bifunctional catalysts having spatially separated OER/ORR reactive sites that can be synthesized via the simple and scalable electrochemical method, which does not require the skill and optimization of binder and electron-conducting additives.

Tongyangxiao Lotion promotes postoperative wound healing in a rat model of anal fistula by downregulating inflammatory factors and suppressing inflammation

To explore the mechanism of Tongyangxiao Lotion (TYX) for promoting wound healing following surgery for anal fistula. The active ingredients and drug targets of TYX were explored using TCMSP and BATMAN databases, and the targets associated with wound healing were screened using GeneCards and OMIM databases; the intersecting drug and wound-related targets were analyzed with protein-protein interaction (PPI) analysis and GO and KEGG enrichment analyses. In 25 SD rat models with simulated anal fistula surgery, the effect of wound dressing with TYX at low, medium and high doses (once daily for 14 days) on wound healing were assessed in comparison with potassium permanganate (PP) solution. The granulation tissues collected from the wounds were examined for pathological changes with HE staining and for TNF-α expression using immunohistochemistry. The expressions of 1β, TNF-α, IL-6 mRNA and proteins in the granulation tissue were detected using RT-qPCR, Western blotting or ELISA. Network pharmacology analysis yielded 156 common targets between TYX and wound healing, and among them IL-1β, TNF- α, and IL-6 were identified as potential targets of TYX for promoting wound healing. Six core components of TYX were capable of binding to IL-1β, TNF-α, and IL-6 with binding energies all below -6.0 Kcal/mol. In the rat models, the wounds with TYX and PP solution dressing showed significantly reduced inflammatory cell infiltration and increased fibroblasts and collagen deposition. TYX at the 3 doses and PP solution all significantly reduced the expressions of IL-6, IL-1β, TNF-α mRNA and IL-6 protein in the granulation tissues, but TYX at the medium and high doses produced significantly stronger effects than PP solution for lowering TNF-α protein expression and mRNA expressions of TNF- α and IL-6. TYX accelerates wound healing by down-regulating the inflammatory factors and reducing inflammation in the wounds.

Bottle-in-bottle reaction device: Portable gas pressure meter for rapid and on-site analysis of oxalate in spinach and tea beverages

A gas pressure meter-based portable/miniaturized analytical kit was established for rapid and on-site detection of oxalate. Potassium permanganate (KMnO4) and oxalate solution were mixed together in bottle-in-bottle reaction device, a simple oxidation reaction process occurred within 6 min and carbon dioxide (CO2) was generated, inducing the pressure of the sealed bottle changed, which was measured by a portable gas pressure meter. A detectable range of 0.1–6 μmol mL−1 and a detection limit of 0.064 μmol mL−1 were achieved. The proposed analytical method was further used for the analysis of several real samples (spinach, beverages and water samples), with the recoveries of 89–111%. Considering the interferences from the complicated matrix, calcium chloride (CaCl2) was served as a precipitant, oxalate (C2O42−) was precipitated with Ca2+ to form precipitation (CaC2O4), CaC2O4 was then separated from the matrix by centrifuge/filter, eliminating the interferences. It is a rapid, easy-used and interference-free analytical system/device for oxalate on-site and real time analysis.

Low-temperature slow-release permanganate gel for groundwater remediation: Dynamics in saturated porous media

Due to its adverse health and environmental impacts, groundwater contamination by toxic organic compounds such as chlorinated solvents is a global concern. The slow-release permanganate gel (SRP-G) is a mixture of potassium permanganate (KMnO4) and colloidal silica solution. The SRP-G is designed to radially spread after injection via wells, gelate in situ to form gel barriers containing permanganate (MnO4−), and slowly release MnO4− to treat plumes of chlorinated solvents in groundwater. This study aimed to characterize the effects of temperature on the dynamics of SRP-G in saturated porous media.In gelation batch tests, the viscosity of ambient-temperature (24 °C) SRP-G with 30 g/L-KMnO4 was 21 cP at 70 min, 134 cP at 176 min, and peaked at 946 cP to solidification at 229 min. The viscosity of low-temperature (4 °C) SRP-G with 30 g/L-KMnO4 was 71 cP at 273 min, 402 cP at 392 min, and peaked at 818 cP to solidification at 485 min. A similar pattern, e.g., increased gelation lag time with low-temperature SRP-G, was observed for SRP-Gs with 40 g/L, 50 g/L, and 60 g/L KMnO4. In flow-through tests using a glass column filled with saturated sands, injection rates, spreading rates, and release durations were 0.6 mL/min, 46 mm/min, and 33 h for KMnO4(aq), 0.2 mL/min, 2 mm/min, and 38 h for ambient-temperature SRP-G, and 0.4 mL/min, 16 mm/min, and 115 h for low-temperature SRP-G, respectively. These results indicated that the injectability, injection rate, and gelation lag time of SRP-G and the size, release rate, and release duration of MnO4− gel barriers can be increased at low temperatures. The low-temperature SRP-G scheme can be useful for treating large or dilute dissolved plumes of chlorinated solvents or other pollutants in groundwater.

Physical and thermomechanical characterization of unidirectional Helicteres isora fiber-reinforced polylactic acid bio-composites

Identifying novel cellulose fiber bio-composites has become a vital initiative in the exploration of sustainable materials due to increased global concern for the environment. This growing focus on eco-friendly materials has gathered significant attention in recent years. The current investigation deals with one such material, Helicteres isora reinforced Polylactic acid composites. Surface chemical treatment of fiber is one of the most effective methods to modify the hydrophilic fiber to increase its compatibility with the polymer matrix. Sodium hydroxide was used as a pre-treatment chemical to remove any impurities from the fiber surface. Pre-treated fibers were treated with Methacryl silane and Potassium permanganate solution to chemically modify the fiber surface. Density, void content and water absorption behavior of the composites were analyzed as per the standard procedure. Tensile and flexural tests were conducted to evaluate the mechanical strength, modulus, and flexibility of the unidirectional composites. Thermogravimetric and differential thermal analyses were performed to investigate the thermal stability, melting behavior and degradation profiles of prepared composites. A study of failure mechanisms and morphology of the fractured surface through photographs and SEM images revealed fiber splitting and delamination as the dominant reasons behind the failure of composites under tensile loading. Silane-treated Helicteres isora fiber-reinforced Polylactic acid composite exhibited lower water absorption and higher tensile strength than its counterparts. Untreated fiber composite showed maximum flexural strength among the tested composites. By collectively evaluating the results of the tests and properties of the composites, silane-treated fiber-reinforced Polylactic acid composites stands out as the most favorable choice.

Modification of morphological, structural and optical properties of graphene oxide by alteration molarity of aqueous KMnO4 solution

This work reports a nontraditional modified Hummer’s method to synthesize graphene oxide (GO) nanosheets by adjusting the oxidation process via a different-molarity potassium permanganate (KMnO4) solution instead of utilizing its powder. The effect of KMnO4 concentrations on the structural and morphological properties of GO nanosheets was studied. Oxidant solutions of 0.5 M, 1 M and 1.5 M were experimented to control the properties of the GO layers. Then, the samples were characterized by X-ray diffraction (XRD), field-emission scanning electron microscope (FE-SEM), Raman and ultraviolet-visible (UV–Vis) spectroscopes. Finally, oxidant concentration was optimized at 1 M by which thinner, high-quality crystalline GO layers and wider bandgap energy ( E g ) were obtained. It is thus confirmed that such a modification in the oxidation is a pioneering process to improve the GO properties.

Dissipation kinetics, dietary risk assessment and decontamination studies of tolfenpyrad in okra

QuEChERS method with liquid chromatography-mass spectrometry (LC-MS/MS) technique was employed for the estimation of tolfenpyrad residues in okra crop. The method was validated in terms of linearity, matrix effect, limit of quantification (LOQ), limit of detection, recovery, repeatability and reproducibility as per SANTE (2021) guidelines. After two applications of tolfenpyrad @150 (X), 187.5 (1.25X), 300 g a.i. ha−1 (2X), the mean initial residues were found to be 0.57, 0.78, and 1.21 mg kg −1. The residues reached below limit of quantification of 0.01 mg kg−1 after 10th, 15th, and 20th day at all the three doses, respectively. Dissipation kinetics of tolfenpyrad in okra was calculated to follow first order kinetics with half-life (T1/2) values of 2.10, 2.16, and 2.24 days at X, 1.25X and 2X dosages, respectively. Risk assessment in terms of hazard quotient (HQ) revealed that the application of tolfenpyrad was safe for safe consumption. Decontamination processes involved tap water wash, soaking in 2% salt solution, soaking in 2% salt solution along with boiling, soaking in 0.1% sodium bicarbonate solution, soaking in 0.01% potassium permanganate solution, boiling and frying. Frying followed by soaking in 2 per cent salt solution along with boiling proved to be highly effective in reducing tolfenpyrad residues by 80–85 and 76–79 per cent, respectively at all the three treatments.

Advances in making Mn oxide‐coated sands

AbstractManganese (Mn) oxide‐coated sand has been suggested as an amendment for scrubbing metals in water filtration beds and also as a less concentrated medium for uniformly amending soils with Mn oxides in mesocosm scale studies. Earlier work at the lab bench scale, using potassium permanganate (KMnO4) solutions that were reduced with sodium (Na) lactate, resulted in sands coated with about 0.13% Mn. The goal of this project was to increase the amount of Mn oxide that could be coated on sand to make it a more useful amendment and also to attempt to scale up the procedure to produce larger (kg) quantities of coated sand. Titration experiments examined the effects of (1) varying the molar ratio of Na lactate to KMnO4, (2) varying the rate at which the titration was accomplished, and (3) varying the concentration (molarity) of the original KMnO4 solution. The results of this work led to an optimal approach utilizing 0.32 M KMnO4 solution that was titrated to a final lactate:permanganate ratio of ∼1.1 with 10% of the lactate being added every 10 min while the suspension was being stirred. The proportion of sand to an initial solution was also increased 5–20 fold to between 50 and 200 g per 100 mL of solution. Applying this method and using a large 20‐ to 30‐L reaction vessel yields sands coated with up to 0.7% Mn in batches 5–10 kg is size, which could be useful as an amendment in mesocosm scale studies, or as a component of treatment filter beds. The examination of various size fractions of the coated sands demonstrated that more Mn was coated on finer sand fractions, which appears to be a function of the particle surface area available for the coating of Mn oxides, and at a rate of 0.3–0.5 µg Mn mm−2 of the particle surface.

Окисление керогена горючих сланцев перманганатом калия в щелочной среде

We carried out the analytical oxidation of kerogen samples from oil shales of Ordovician kukersite from the Baltic region, Domanik shales from Timan-Pechora and Upper Jurassic oil shales of the Kashpir deposit by potassium permanganate in an alkaline medium. We performed a single-stage oxidation with 3.5 % solution of potassium permanganate, followed by analysis of trimethylsilyl derivatives of carboxylic acids using chromatography-mass spectrometry, and multi-stage oxidation by 0.5 % solution of potassium permanganate and analysis of oxidation products using IR spectroscopy. Some n-alkyl structures are peripherally associated with the kerogen matrix in the kerogen of Domanik and Jurassic shales, while in the structure of kukersite kerogen, n-alkyl structures are mainly connecting links for larger fragments. Milder, in case of a multi-stage process, oxidation results in formation of large fragments of kerogen, generally repeating its carbon structure, but more oxidized.

Reduction in microbial load from the preputial cavity of black Bengal bucks after washing with Potassium permanganate solution

Reduction in microbial load from the preputial cavity of black Bengal bucks after washing with Potassium permanganate solution

Propagation of Campanula bayerniana (Campanulaceae) by seeds as a reproduction model for the conservation of threatened small-seed plant species

The in vitro seed propagation of small seeded Campanula species often incurs complications in the manual handling of the tiny seed material from seed sterilisation to seedling transplantation in soil. The lack of a simple and effective protocol which minimises manual operations makes the propagation of such species both challenging and inefficient. This study aimed to develop a protocol for the seed reproduction of threatened Campanula and other threatened small-seed plant species. The method was successfully tested on Campanula bayerniana subsp. bayerniana. The saplings were cultivated over a 5-month period through seed germination under in vitro conditions followed by their transfer to containers with a soil mix. The protocol employs small filter paper discs on which the seeds germinate and continue their development in soil substrate until the full biodegradation of the discs. The method involves surface treatment of the seeds with potassium permanganate solution, thus avoiding additional washing phases and direct contact with the seeds and seedlings, thereby preventing mechanical damage. This also facilitates the handling of each seed separately, minimising seed loss particularly when working with a small number of seeds. This study is also the first known example of the ex situ propagation of Campanula bayerniana.

Экспериментальное исследование процесса смешения жидкостей в проточном микроканале в условиях развития неустойчивости Рэлея–Тейлора

This study experimentally investigates the influence of Rayleigh-Taylor instability on the liquid mixing process in a flow-type microchannel. We investigated a two-layer liquid-liquid system consisting of a denser aqueous solution of potassium permanganate (upper layer) and less dense pure water (lower layer) with a fixed density gradient. A colorimetric method based on the dependence of light absorption by solutions on the concentration of the dissolved substance was used to reconstruct the two-dimensional concentration field. Based on the obtained data, we analyzed the spatial structure of convective flows and the degree of liquid mixing along the channel. The studies were carried out at low Reynolds numbers, which precludes the development of turbulent flow, and across a wide range of Richardson numbers that indicate the ratio of buoyancy to inertial forces in the formation of convective structures. We found that at high Richardson numbers, the development of Rayleigh-Taylor instability ensures almost complete mixing of liquids within five calibers from the channel inlet. Reducing the Richardson number by increasing the flow rate through the channel leads to a slowdown in the instability development and, consequently, in a significant decrease in mixing efficiency along the channel. We demonstrated that with optimal values of governing parameters, the characteristic liquid mixing length can be reduced by an order of magnitude compared to pure diffusive mixing scenarios. The obtained results demonstrate the effectiveness of convective instability mechanisms in controlling mass transfer processes in flow-type microchannel systems.

Evaluation of anthocyanines antioxidant properties using chromatography

A method for assessing the antioxidant properties of anthocyanins was proposed, using a reaction with an aqueous solution of potassium permanganate followed by chromatographic determination of the concentration of various anthocyanins in complex mixtures in comparison with the original solution. The main feature of the method is the exclusion of the occurrence of a chain of successive oxidation reactions of each initial anthocyanin, which is actually observed when using traditional methods for determining antioxidant properties. For this purpose, a lack of oxidant was used, which should be consumed mainly in the first stages for each antioxidant, under the assumption that the activity of the initial (least oxidized) anthocyanin is higher than that of the products formed from it. Only such a scheme allows comparing antioxidant activity (as a time-dependent parameter instead of the usually determined antioxidant capacity) depending on the structure of the molecule. Based on a study of the oxidation of 3-glucosides with potassium permanganate of five different main natural anthocyanidins (in extracts of grape fruits and leaves of Cercis canadensis), a dependence of antioxidant activity was established, which increased in the series: Pn3Glu<Cy3Glu<Mv3Glu<Pt3Glu<Dp3Glu. Consequently, the antioxidant activity of anthocyanins of the same type increased with the addition of an OH group to the B ring of the aglycone more strongly than the addition of a methoxy group. The analysis of anthocyanins from the fruits of grape variety Mercedes extract showed that the acylation of peonidin and malvidin 3-glucosides by p-coumaric acid did not lead to higher resistance. Therefore, the conclusion about higher stability of acylated anthocyanins are not always true. An analysis of the oxidability of various 3-glycosides by potassium permanganate was performed on the extract of black currant and red viburnum fruits and showed that in the first case, the oxidability does not reliably change when moving from 3-glucosides to 3-rutinoside. Moreover, in the second case, the addition of a second monoside to the existing 3-glucoside for both arabinoside and rhamnoside led to a decrease in activity. This indicates that accompanying extractives can alter the course of some reactions.

Physical, strength and acoustic properties of lightweight cement composite with preplaced chemically-treated crumb rubber

The valorisation of waste tyre crumb rubber (CR) as a sustainable construction material can alleviate environmental pollution and save natural aggregate consumption. However, its use in cement composite can result in a significant loss of strength due to weak adhesion and the non-uniform dispersion of CR. To compensate this strength loss, this research aims to investigate the innovative incorporation of chemically treated CR via the preplaced aggregate mixing (PM) method in producing a lightweight cement composite. The CR was treated with different chemicals, namely soaking in potassium permanganate and sulphuric acid solutions. The findings reveal a significant improvement in compressive strength (up to 160%) and water absorption reduction (from 20% to 175%) using the chemically treated CR and PM mixing methods, producing a lightweight cement composite with a density of about 1535 kg/m3. The SEM observation demonstrates the improvement in the CR–paste interface due to the treatment of the CR and the PM mixing methods, and due to the chemical treatment, which improved the wettability of the CR. On the other hand, the sound absorption and noise reduction coefficient of the chemically treated CR lightweight cement composite was almost similar for both the normal mixing (NM) and the PM methods. Overall, the results demonstrate that the CR treatment with sulphuric acid is promising for the PM method to produce a lightweight cement composite.

Effect of Acid-Assisted Hydrothermal Carbonization Temperatures on the Hydrochar Properties for Supercapacitor Application

The investigation of biomass-based, cost-effective, efficient, and environmentally materials with high power density and fast ion/electron transfer is intensively carried out for the development of renewable energy storage devices. Pyrolysis and hydrothermal carbonization (HTC) are two common methods of thermochemical conversion to synthesize biomass-derived based carbon. Compared to the pyrolysis method, HTC is a more promising strategy because it can be carried out without a pre-drying process, has a high yield, low ash content, and requires a relatively low temperature (180-250 °C). The carbon produced from the HTC process is known as hydrochar. This study reports the acid-assisted hydrothermal carbonization temperature on the hydrochar properties and its application for supercapacitor electrodes. Hydrochar was synthesized from extracted avocado seed waste with potassium permanganate and sulfuric acid catalyst solution at 200 °C for 12 h. The effect of one- and two-stage HTC temperature on the hydrochar properties were compared. The hydrochar characterization includes yield, SEM, XRD, FTIR, and cyclic voltammetry analysis. According to the characterization and analysis results, hydrochar produced has the 3D porous network morphology and the highest specific capacitance of 73.54 F/g. In conclusion, hydrochar derived from avocado seed through the acid-assisted HTC can be a potential way for supercapacitor electrodes.

Increased durability of glass composites

Composite materials based on cement binders are currently among the widely used for the construction of transport structures. In accordance with regulatory requirements, concrete for transport construction must have improved physical, mechanical and operational properties. One of the areas that makes it possible to obtain materials with improved properties is the use of various fillers, including waste from industrial enterprises. Among the variety of man-made waste, a significant part is broken glass, which is an effective secondary resource and can be used in the construction industry to produce binders, fillers, composites and structures based on them. The article presents the results of research aimed at increasing the durability of composite materials based on cement binders filled with cullet. Effective additives have been proposed to reduce the reactivity of broken glass with binders. Processing of experimental data was carried out using experimental planning methods. The study of the experimental design showed that it is possible to reduce the number of factors previously involved in the formation of the experimental planning matrix. It was established that the reduction in the number of factors is carried out with a confidence probability of at least 0,95. Experimental studies were carried out on the biological resistance of composites filled with broken glass and their components under the influence of filamentous fungi. It has been established that pre-treatment of the filler surface with a 1, 3, 5 % solution of potassium permanganate helps impart fungicidal properties to the composites, and treatment with a 7,5 % solution makes it possible to obtain filled materials with fungicidal properties.

THE INFLUENCE OF THE SYNHTETIC WAY OF LAYERED-TYPE MANGANSESE DIOXIDE ON THE PROPERTIES OF CATHODE MATERIALS FOR AQUEOUS ZINC-ION BATTERIES

This research presents an analysis of physico-chemical, structural and electrochemical properties of cathode materials for aqueous zinc-ion batteries based on manganese dioxide with birnessite-type structure in dependence on the conditions of hydrothermal synthesis. The manganese oxides obtained are capable to the reversible zin ions intercalation into the crystal lattice because of large interlayer distances. They were considered two approaches of synthesis: a reaction between manganese sulfate and potassium permanganate at 160 °С (MnO2-I) and a hydrothermal treatment of potassium permanganate solution at 220 °С (MnO2-II). From the structural analysis it was shown that both methods allow obtaining the birnessite-type manganese dioxide. At the same time, electrochemical properties of cathodes obtained differ in the models of aqueous zinc-ion batteries. MnO2-II material demonstrate higher initial specific capacity (180 mAh∙g-1 at current density 0.3 A∙g-1) while its cyclic stability is on 40% lower than for MnO2-I material. This can be explained with higher surface area of the active material and lower crystallinity.

Shelf life enhancement technique of Musa acuminata in a controlled environment and optimization of process parameters affecting shelf life using genetic algorithm.

An economical and effective storage solution has been designed in this work for the storage of postharvest fruits and vegetables. Musa acuminata or banana has a shelf life of 5-6 days in open uncontrolled environment. This article reports a storage solution of M. acuminata in a controlled enclosure containing titanium oxide (TiO2 )-coated inner walls and irradiated with ultraviolet ray of band "C," an air filtration unit, 5% by volume potassium permanganate (KMnO4 ) solution in a clay pot, grow lights, and activated charcoal granules. The same fruit was kept in an uncontrolled environment too. The percentages of dark spots on banana (M. acuminata) upon storage in controlled and uncontrolled environments have been estimated using an image-processing algorithm. The prediction of dark spots was conducted using multi-linear and multivariate polynomial regression. Experimentation with optimum process parameters obtained with genetic algorithm resulted in a shelf life extension of 6 days as compared to its storage in an uncontrolled environment. The setup can be used in vegetable and fruit markets for the extension of shelf life of postharvest perishable items in a compact and cost-effective manner. The setup does not use any refrigeration process thereby decreasing energy requirement.

“HOOF WOODPECKER” AT CORONARY BAND AND HOOF WALL LEVEL IN FORESTRY ENVIRONEMENT WORKING HORSES

"Hoof woodpeckers or penetrating foreign bodies in the hoof are frequently found in working horses. A special pathology is encountered in horses that work in forestry environment. Unlike the metalic foreing body (so called clou de rue) that just penetrate the sole, the wood goes in by hammering (by sudden pressure). Movement between the hoof and the 3rd phalanx causes the foreign body to advance in depth. The study was carried out on a number of 54 working horses in the forestry environment, males, aged between 4 and 14 years. The diagnosis was established on the basis of the clinical examination and the history, the radiological examination being inconclusive. As a particularity, the fragmentation of wooden foreign bodies does not occur at the time of extraction but at the time of hammering through the hard tissues due to the forces that determine the change of the penetration trajectory. Restraint was achieved by physical and chemical means (sedation and anesthesia). The wound was cleaned and then the hole in the hoof wall was widened with the help of the hoof knife. The foreign body was extracted using a thick forceps or a dental extraction forceps. The dressing was changed every 48h until healing. The wound had been washed with potassium permanganate solution (KMnO4) or betadine 10%."