MnSO4 Concentration Research Articles

Effect of MnSO4 concentration on the electrochemical performance of β-MnO2/3D graphene-carbon nanotube hybrids cathode for aqueous zinc-ion batteries

Effect of MnSO4 concentration on the electrochemical performance of β-MnO2/3D graphene-carbon nanotube hybrids cathode for aqueous zinc-ion batteries

Optimization of hydrolases production by Penicillium crustosum in submerged fermentation using agro-waste residues as cosubstrate

This study aimed to enhance the production of exo-polygalacturonases (exo-PG), xylanases, and endoglucanases using Penicillium crustosum through submerged fermentation. Lemon peel (LP) and wheat bran (WB) were examined as potential cosubstrate for hydrolase production. The highest exo-PG and endoglucanase activities were observed with LP, whereas xylanase activity showed improvement with the addition of WB. To optimize exo-PG and endoglucanase production, a 23 Face-Centered Central Composite Design (FCCCD) was employed, varying crucial physicochemical factors. Similarly, a 24 FCCCD was utilized to optimize xylanase production by varying temperature, pH, MnSO4 concentration as a cofactor, and the PDB culture medium. Under optimized conditions, exo-PG production reached 1427.99 ± 27.41 U/mL, marking a 45% increase compared to initial fermentation conditions. Endoglucanase production peaked at 62.68 ± 9.65 U/mL under conditions of 45 °C, pH 5.5, and 2.5 g/L MnSO4. Xylanase production reached 271.77 ± 8.50 U/mL under optimal conditions (37.5 °C, pH 5.5, 2.5 g/L MnSO4, and 62.5% PDB). The optimized simultaneous production of the hydrolytic cocktail occurred at 45 °C, pH 5.5, and 2.5 g/L MnSO4 with LP, yielding maximum activities of 959.74 U/mL for exo-PG, 61.98 U/mL for endoglucanases, and 65.60 U/mL for xylanases as determined by FCCCD. In conclusion, Penicillium crustosum shows promise as a hydrolase producer, and the utilization of agro-wastes as cosubstrate enhances the yield of enzymes with industrial relevance.

Wrapping massive MnO2 around in-situ defective carbon felt with strong interaction for superb supercapacitive performance

This study focuses on the dual-functional one-step preparation method and characterization of the high-mass loading electrode with outstanding capacitive performance. Three electrodes, MnO2/GF-100, MnO2/GF-300, and MnO2/GF-600, are prepared using anodic polarization from a solution containing various concentrations of MnSO4, 100 mM, 300 mM, and 600 mM, respectively. The anodic electrodeposition of massive MnO2 in conjunction with in-situ functionalization of GF is done via sweeping anodic potential from 2.5 to 0.5 V alongside a sweep rate of 5 mV s−1. At a high potential region, the GF surface is modified via oxygenated functional groups that assist in the regular deposition of MnO2. In the low potential region, the degree of MnO2 deposition is heightened. Additionally, by raising the salt concentration in the deposition bath, the extent of GF's functionalization is greatly enhanced, leading to heavy deposition of MnO2 with a cinnamon stick-like structure and rolling GF. Wrapping MnO2 over defective GF is addressed using characterization tools, SEM, Mapping EDX, XPS, XRD, contact angle measurements, and Raman analysis. Advantageously, the amorphous and massive MnO2/GF-600 electrode (3.82 mg cm−2), with a cinnamon stick-like structure, displays the best performance by exhibiting a maximum specific capacitance of 627.9 mF cm−2 (166.9 F g−1) over a wide potential window up to 2.4 V. Interestingly, MnO2/GF-600 shows superb capacitance retention of 129% for 5000 cycles. The remarked capacitive execution is assigned to enhanced conductivity, an amorphous structure, and strong contact between the electrode and MnO2 active material.

Effect of Mn Deficiency on Carbon and Nitrogen Metabolism of Different Genotypes Seedlings in Maize (Zea mays L.)

Manganese deficiency critically impairs the function and stability of photosystem II (PSII) and negatively impacts crop growth and yield. However, the response mechanisms of carbon and nitrogen metabolism to Mn deficiency in different genotypes of maize and the differences in Mn deficiency tolerance are unclear. Herein, three different genotypes of maize seedlings (sensitive genotype: Mo17, tolerant genotype: B73, and B73 × Mo17) were exposed to Mn deficiency treatment for 16 days using liquid culture with different concentrations of MnSO4 [0.00, 2.23, 11.65, and 22.30 mg/L (control)]. We found that complete Mn deficiency significantly reduced maize seedling biomass; negatively affected the photosynthetic and chlorophyll fluorescence parameters; and depressed nitrate reductase, glutamine synthetase, and glutamate synthase activity. This resulted in reduced leaf and root nitrogen uptake, with Mo17 being most severely inhibited. B73 and B73 × Mo17 maintained higher sucrose phosphate synthase and sucrose synthase activities and lower neutral convertase activity compared to Mo17, which resulted in higher accumulation of soluble sugars and sucrose and maintenance of the osmoregulation capacity of leaves, which helped mitigate damage caused by Mn deficiency. The findings revealed the physiological regulation mechanism of carbon and nitrogen metabolism in different genotypes of maize seedlings that resist Mn deficiency stress, providing a theoretical basis for developing high yield and quality.

Genotypic Variation in Thai Fragrant Rice in Response to Manganese Application and Its Effects on 2-Acetyl-1-Pyrroline Content, Productivity and Gene Expression

The fragrance in rice plays a significant role in consumer decisions and is influenced by many environmental factors, e.g., water and fertilizer application during cultivation and post-harvest management. Manganese (Mn) is an essential micronutrient for plant growth and development, and its effects on the fragrance and yield of fragrant rice varieties have not been well-studied. The aim of this research was to determine the effects of Mn application rates on the 2-acetyl-1-pyrroline (2AP) content, yield and gene expression of Thai fragrant varieties. Three rice varieties, i.e., BNM4, KDML105 and KH-CMU, were grown in pots with varying concentrations of MnSO4—150, 200 and 250 mg kg−1 soil—and compared with a control with no Mn application (Mn0). At maturity, the grain yield was evaluated, and the 2AP was analyzed with GC-MS as the grain aroma content. Taken together, the results suggest that Mn application during cultivation tends to increase the 2AP content of fragrant rice and its productivity and tends to affect gene expression. However, it is important to conduct further studies to evaluate the responses for more fragrant rice varieties and additional gene expression, including the determination of key intermediate compounds along the 2AP biosynthesis pathway to confirm the effect of Mn application on fragrant rice. This information could be useful in assisting plant breeders and physiologists in their efforts to improve the crop productivity and grain quality of fragrant rice varieties.

(Digital Presentation) Electrodeposition of Thin Films of Femn Alloys for Biodegradable Scaffolds Fabrication

Biodegradable metallic scaffolds are interesting biomaterials for applications in temporary implants for bone regeneration because of their good mechanical properties. In addition, the need for a second surgery to remove the implant is reduced if biodegradable metals are used. Fe has adequate mechanical properties for scaffolds manufacture and suitable biocompatibility. However, Fe shows slow biodegradation rates for the application and, therefore, different approaches have been developed such as the development of alloys or by reducing the thickness of the Fe strut in the scaffold. FeMn alloys are considered ideal materials, as they are not ferromagnetic. In addition, additive manufacturing technologies (3D printing) are considered appropriate to manufacture these scaffolds due to the ability to obtain complicated geometries and customized parts for a specific bone injury site. Electrodeposition is also an interesting technique because it allows the deposition of thinner strut walls of Fe (or alloys) with high purity, in addition to providing a good surface finishing. The aim of the first part of this work is to electrodeposit thin films of FeMn alloys and to evaluate its microstructure and mechanical properties. The thin films were electrodeposited potentiostatically from sulfate electrolytes with different concentrations of FeSO4 and MnSO4. The effect of deaeration, substrate material and electrodeposition potential were evaluated. The microstructure of the electrodeposited films was characterized by SEM/EDX and XRD. The surface finishing was evaluated by AFM and the mechanical properties by microhardness measurements.

ON UNCERTAINTIES IN THE MANGANESE SULPHATE BATH TECHNIQUES.

The manganese sulphate bath is a globally recognized method for determining emission of neutrons from radionuclide since 1959. In combination with the measurement of neutron emission anisotropy, this method is standardly used for the primary standardization of dosimetry quantities of neutron radiation. To achieve results at the metrology level, it is essential to have all quantities which contribute to the overall uncertainty properly determined and contributing uncertainty minimized. This paper is focused on the quantification of the main uncertainty sources for in-house developed manganese bath. In previous analyses, the final uncertainty of neutron emission rate was <1%, which was considered as a target value. Nevertheless, the relative change from reference values was relatively high and out of this uncertainty. This relative change raised questions about the accuracy of contributed parameters, like vessel volume, concentration of MnSO4 or computational model. Therefore, this paper focuses on determination and re-evaluation of these parameters with corresponding uncertainties.

An in-depth mechanistic insight into the redox reaction and degradation of aqueous Zn-MnO2 batteries

Rechargeable aqueous Zn/MnO2 batteries raise massive research activities in recent years. However, both the working principle and the degradation mechanism of this battery chemistry are still under debate. Herein, we provide an in-depth electrochemical and structural investigation on this controversial issue based on α-MnO2 crystalline nanowires. Mechanistic analysis substantiates a two-electron reaction pathway of Mn2+/Mn4+ redox couple from part of MnO2 accompanying with a reversible precipitation/dissolution of flaky zinc sulfate hydroxide (ZSH) during the discharge/charge processes. The formation of the ZSH layer is double-edged, which passivates the deep dissolution of MnO2 upon discharging, but promotes the electrochemical deposition kinetics of active MnO2 upon charging. The cell degradation originates primarily from the corrosion failure of metallic zinc anode and the accumulation of irreversible ZnMn2O4 phases on the cathode. The addition of MnSO4 to the electrolyte could afford supplementary capacity contribution via electro-oxidation of Mn2+. However, a high MnSO4 concentration will expedite the cell failure by corroding the metallic zinc anodes. The present study will shed a fundamental insight on developing new strategies toward practically viable Zn/MnO2 batteries.

Determination of cytogenetic and epigenetic effects of manganese and copper on Zea mays L.

Heavy metal accumulation and its possible effects are prominent problem for not only human health but also for the environment and plant systems due to that heavy metals are non-biodegradable. In this research, it was aimed to examine the impacts of heavy metals on toxicity and genotoxicity in maize. Seeds of corn were subjected to various concentrations of MnSO4 and CuSO4 for determining their effects on DNA methylation, DNA damage levels, protein and phytohormone alterations. The results revealed that an increase in copper and manganese concentrations causes decrease in soluble protein levels, genomic template stability (GTS) and mitotic index but causes an increase in RAPD profile alterations and DNA hypermethylation. Additionally, HPLC analyses show that CuSO4 and MnSO4 contamination reduces growth-promoting hormones, like gibberellic acid (GA), zeatin (ZA) and indole acetic acid (IAA), and increases the abscisic acid (ABA). This study obviously indicated that CuSO4 and MnSO4 have epigenetic and genotoxic effects. A decrease in the phytohormone level (ZA, GA, and IAA) and an increase in the ABA level under CuSO4 and MnSO4 are thought to be a part of the defense system of maize to struggle with stress.

The identification of ethanol and aromatic compounds from delignification of cacao pod husk using Phlebia sp.MG-60

The agricultural residue can be significantly transformed to both renewable energy and high value-added chemicals using biorefinery concept. Biological pre-treatment of lignocellulosic biomass and ethanol production from cacao pod husk can be done within a single unit-operation using a single microorganism white rot Phlebia sp. MG-60. The objective of this study was to identify the potential of white rot Phlebia sp. MG-60 to produce ethanol and aromatic compounds under consolidated biological processing (CBP). The effect of different concentration of MnSO4 on detecting of cellulose, hemicellulose, lignin and MnP activity were measured on 0, 14 and 28 days. The selected best concentration of MnSO4 was then used for detecting of potential aromatic compound released and the yield of ethanol. By adding the inducer (MnSO4), the results revealed that the addition of MnSO4 could escalate the activity of manganese peroxidase (MnP) from Phlebia sp. MG-60 in order to depolymerize lignocellulose. The yield of ethanol produced during the bioconversion process was 2g/L. Furthermore, several aromatic compounds such as 2, 3-Dimethylphenol, trans-cinamic acid, caffeic acid, and vanillin were potentially obtained from cacao pod husk incubated by the fungus for 28 days.

Nutripriming of Seeds with Manganese Sulphate for Better Germination and Seedling Vigour in the East Indian Sandalwood (Santalum album L.)

Poor and staggered seeds germination is the major hurdle in plantation establishment of sandalwood (Santalum album L) which is one among the esteemed timber species of the world. Nutrient priming is an innovative approach that combines the positive effects of seed priming and improved nutrient supply thereby helping in mass production of quality seedlings. In the present investigation, the effect of nutripriming using MnSO4 on germination and seedling growth of the sandal was studied. The experiment was conducted in two factorial CRD with concentration of MnSO4 (0.4M, 0.6M, 0.8 M and 1 M) and duration of treatment (3, 6, 9 and 12 days) as factors. Results indicated that seeds subjected to nutripriming at 0.8 M for 3 days recorded the highest germination (88.0%) followed by those soaked at 0.4 (86.7%), 0.6 (86.7%) and 1.0 M (86.0%) concentrations respectively. The nutri-primed seeds incubated for more than 3 days recorded a germination < 10%. Multivariate analysis indicated that the seedling growth and biomass production were also higher at 0.8 M concentration for 3 days followed by 0.4 M for 6 days. Hence, we recommend nutripriming at 0.8 M for 3 days and 0.4 M for 6 days for superior planting stock production of sandal.

Thermodynamic Properties of Cetyltrimethylammonium Bromide in Ethanol-Water Media With/without the Presence of the Divalent Salt.

The physicochemical properties of cetyltrimethylammonium bromide (CTAB) in pure water and ethanol-water mixtures in the presence and absence of MnSO4.6H2O were studied by measuring the conductivity at room temperature. The concentration range of CTAB was ~1.00 × 10-5 M to ~1.00 × 10-2M and the concentration of MnSO4.6H2O was 0.001 M, 0.005 M, 0.01 M. With increasing ethanol content in the solvent composition, the critical micelle concentration (CMC) and the degree of micellar dissociation (α) of CTAB increased. With the help of CMC and α, the standard free energy of micellization (ΔG m ο ) was evaluated. With an increase in ethanol content, the negative values of ΔG m ο decreased. CTAB micellization was tested in the context of specific solvent parameters. The solvent conductivity ratio at CMC to limiting conductivity was employed as a solvophobic influence. The addition of salt (MnSO4.6H2O) decreases the CMC of CTAB due to the screening of the electrostatic repulsion of the head groups. Here, we report that micellization is strongly influenced by salt concentration.

Electrochemically activated MnO cathodes for high performance aqueous zinc-ion battery

Aqueous Zn-ion batteries (ZIBs) attract ever-growing attention due to low cost, high safety, and environmental friendliness. Among the limited cathode candidates, manganese-based oxides stand out owing to large ion channels and multiple valence of Mn. Notably, MnO, thought to be inactive before, actually exhibits high energy densities in AZIBs, thus arousing wide interests. Herein, the electrochemical behavior of MnO electrode is extensively investigated in ZnSO4 electrolytes with different concentration of MnSO4. It is confirmed that the inactive MnO is electrochemically activated during the initial charge process. Greatly, the initial capacity and the following cycling stability of MnO electrode strongly depends on the concentration of MnSO4, indicating that the activation of MnO could be attributed to Mn dissolution, leading to the higher valence of Mn as evidenced by ex-situ XPS analysis. Greatly, a H+/Zn2+ co-insertion mechanism is suggested for the as-activated Mn1-xO electrode according to the ex-situ XRD results. In addition, by constructing a core-sheath MnO@N-doped graphene scrolls (MnO@NGS) configuration through a modified hydrothermal process, the reversible capacity of MnO has been successfully improved to 288 mAh g−1 (0.1 A g−1), leading to high energy density of 367 mWh g−1. More importantly, benefiting from the graphene wrapping and sufficient internal voids, 98% of the initial capacity can be retained after 300 cycles (0.5 A g−1), much better than the unmodified MnO and MnO2 electrodes. This work is expected to deepen the understanding of the charge-storage mechanism of MnO and help to design durable manganese-based cathodes for ZIBs.

The effect of MnSO4 and unrefined sea salt on bioethanol production by lignocellulose degradation of oil palm empty fruit bunches (OPEFB) using Phlebia sp. MG-60

This study aimed to determine the effects of MnSO4 and sea salt against the degradation lignocellulose and ethanol production generated from Oil Palm Empty Fruit Bunches (OPEFB) using Phlebia sp. MG-60. The factorial experiment in a randomized block design was used, consists of two factors: MnSO4 concentration (0, 300, and 600 mg/L), sea salt concentration (0%, 3%, and 5% (w/v). The results revealed that the addition of MnSO4 and sea salt to substrate, and its interaction were significantly different (ρ value < 0.05) on the change of total soluble phenols (mg/g), total reducing sugar (mg/g), pH, lignin concentration (%), weight loss (%) and ethanol concentration (%). The best treatment from this study was obtained from the addition of MnSO4 300mg/l, sea salt 3% incubated for 20 days. This treatment has the highest value of total reducing sugars (22.471 mg/g), total soluble phenols (0.334 mg/g), weight loss (16.23%), ethanol (0.71%), lignin (19.17%) and pH (6.1).

Combined use of Enterobacter cloacae MB20 and the microelements of copper and manganese to control damping-off of tomato

Biocontrol activity of Enterobacter cloacae alone and in combination with copper and mangan on the suppression of tomato damping off was assessed. Rhizoctonia solani damping-off is difficult to control, since its dorman organ sclerotia survive for long periods under various environmental condition. The availability of micronutrients copper and mangan may play important roles in controlling of plant diseases. Results showed that the application of E. cloacae alone decreased damping-off of tomato significantly (P<0.05) by 85%. Combination application of E. clocae with 10μg ml−1 of CuSO4 showed the highest suppression of the disease, followed by the treatment of E. cloacae with 5μg ml−1, as high as 95% and 90% respectively, although the differences was not significant compared to other treatments. Degree of the disease suppression did not differ between application of E. cloacae alone and in combination with both concentration of MnSO4 (μg ml−1 and10μg ml−1), the disease decreased about 85%. Inoculation of R. solani alone into soil resulted significantly highest (P<0.05) of fungal population, it was about 33.7 x 103 CFU g−1 soil, and inoculation of R. solani and E. cloacae reduced significantly fungal population to about 19.0 x103 CFU g−1 soil. E. cloacae produced chitinase and protease, its chitinolytic index was about 0.84, and proteolytic index was 0.61.

Optimized medium via statistical approach enhanced threonine production by Pediococcus pentosaceus TL-3 isolated from Malaysian food

BackgroundThreonine is an essential amino acid that is extensively used in livestock industry as feed supplement due to its pronounced effect in improving the growth performance of animals. Application of genetically engineered bacteria for amino acid production has its share of controversies after eosinophils myalgia syndrome outbreak in 1980s. This has urged for continuous search for a food grade producer as a safer alternative for industrial amino acid production. Lactic acid bacteria (LAB) appear as an exceptional candidate owing to their non-pathogenic nature and reputation of Generally Recognized as Safe (GRAS) status. Recently, we have identified a LAB, Pediococcus pentosaceus TL-3, isolated from Malaysian food as a potential threonine producer. Thus, the objective of this study was to enhance the threonine production by P. pentosaceus TL-3 via optimized medium developed by using Plackett–Burman design (PBD) and central composite design (CCD).ResultsMolasses, meat extract, (NH4)2SO4, and MnSO4 were identified as the main medium components for threonine production by P. pentosaceus TL-3. The optimum concentration of molasses, meat extract, (NH4)2SO4 and MnSO4 were found to be 30.79 g/L, 25.30 g/L, 8.59 g/L, and 0.098 g/L respectively based on model obtained in CCD with a predicted net threonine production of 123.07 mg/L. The net threonine production by P. pentosaceus TL-3 in the optimized medium was enhanced approximately 2 folds compared to the control.ConclusionsThis study has revealed the potential of P. pentosaceus TL-3 as a safer alternative to produce threonine. Additionally, the current study has identified the key medium components affecting the production of threonine by P. pentosaceus TL-3, followed by optimization of their concentrations by means of statistical approach. The findings of this study could act as a guideline for the future exploration of amino acid production by LAB.

Preparation and Characterization of Graphite Substrate Manganese Dioxide Electrode for Indirect Electrochemical Removal of Phenol

Manganese dioxide rotating cylinder electrode prepared by anodic deposition on a graphite substrate using MnSO4 solution in the presence of 0.918 M of H2SO4. The influence of different operational parameters (MnSO4 concentration, current density, time, and rotation speed) on the structure, and morphology of MnO2 deposit film was examined widely. The structure and crystal size determined by X-ray diffraction (XRD), the morphology examined by scanning electron microscopy (SEM) and atomic force microscopy (AFM) techniques. The γ-MnO2 obtained as the main product of the deposition process. It found that the four parameters have a significant influence on the structure, morphology, and roughness of the prepared MnO2 deposit. The crystal size increases with MnSO4 concentration, current density, and rotation speed, and decreasing with time, while the roughness decreases with increasing all of four parameters. It found that the optimum conditions used in preparing MnO2 rotating electrode that gave the smallest crystal size, low roughness and less cracking were 0.33 M of MnSO4, 6 mA/cm2, 2 h, and 200 rpm. Electrochemical oxidation of phenol in a batch reactor was carried out in the presence of NaCl to examine the performance of the prepared MnO2 electrode for degrading phenol and any organic byproducts at different current densities. The results indicate that as the current density increased from 25 to 100 mA/cm2, the chemical oxygen demand (COD) removal efficiency was increased from 59.26 to 99.90%. Kinetics and the effect of temperature on the COD disappearance have been studied. It was clear that COD decreases with time and as the temperature increases, and the value of reaction order equals to 1 as has been found.

Technological condition optimization and kinetic study on the electrochemical soluble manganese(III) production in H2SO4

Soluble trivalent manganese solution can be used as an electrolyte for manganese redox flow battery (MRFB), due to its low cost, environmental friendliness and multiple states of charge. However, poor stability of soluble trivalent manganese solution and low trivalent manganese concentration are the disadvantages of electrolyte. To optimize the stability and conductivity of soluble trivalent manganese solution, the sulfuric acid concentration, one of the major influence factors, should be firstly improved. Two-compartment cell electrolysis technology was successfully used in this work. Moreover, to improve the concentration of Mn3+, some key factors, such as the concentration of MnSO4, current density, electrolysis time and temperature, should be further adjusted. The results demonstrated that the concentration of this produced trivalent manganese (≧ 0.3 M in 6 M H2SO4;≧ 0.4 M in 5 M H2SO4;≧ 0.5 M in 4 M H2SO4) is much higher than that have been reported. Solid product of manganese(III) sulfate was also firstly prepared. For the formation of soluble trivalent manganese, the 5 mol/L H2SO4 is the optimal acidity and 10.9 mA/cm2 is the best current density at 273 K for 3 h. Some electrochemical kinetics parameters had also been calculated (electrolyte is 5 M H2SO4 and 0.4 M MnSO4), e.g., diffusion coefficient of Mn2+ is 5.3057 × 10−6 cm2/s, transfer coefficient of electrode reaction is 0.3782, and exchange current density is 1.5662 × 10−4 A/cm2. The CV results demonstrated that the redox process of Mn(III)/Mn(II) is the quasi-reversible process.

Controlled growth of γ-MnO2 nanoflakes on OMS-2 for efficient decomposition of organic dyes in aqueous solution via peroxymonosulfate activation

The development of green and efficient catalysts for peroxymonosulfate (PMS) activation and abatement of organic pollutants in wastewater is of significant practical interest. In this paper, the three-dimensional mixed manganese oxides of OMS-2 and γ-MnO2 were fabricated through a simple refluxing method from KMnO4 and MnSO4. It was found that growth of γ-MnO2 nanoflakes on OMS-2 can be controlled by the concentration of MnSO4. The catalysts not only have many excellent structural properties such as interconnected network and highly exposed active sites, but also show the high ratio of low valent manganese species. In particular, the catalysts exhibited much higher efficiency for Acid Orange 7 degradation in the presence of PMS than pure OMS-2 or γ-MnO2. The oxidation of Mn(III) species by PMS occurs in the system with the formation of sulfate and hydroxyl radicals contributed to the dye degradation. Moreover, the catalysts showed good stability and reusability during four consecutive cycles. Thus, the environmental friendly mixed manganese oxides of γ-MnO2 and OMS-2 with low cost, facile synthesis process and high efficiency are very promising catalysts for PMS activation and pollutants degradation.

Consistency and Compressibility Characteristics of contaminated Compacted Clay liners

Processed and natural clays are widely used to construct impermeable liners in solid waste disposal landfills. The engineering properties of clay liners can be significantly affected by the leachate from the waste mass. In this study, the effect of inorganic salt solutions on consistency and compressibility characteristics of compacted clay was investigated at different concentrations. Two type of inorganic salt MnSO4 and FeCl3 are used at different concentration 2%, 5%, and 10%. The Clay used was the CL- clay (kaolinite). The result shows that the consistency limits increased as the concentration of salts increased, while the compression index (Cc) decreases as the concentration increased from 2% to 5%, after that the Cc is nearly constant. The swelling index (Ce) tends to increase slightly as the concentration of MnSO4 increased, while it decreases as the concentration of FeCl3 increased.