Extraction Of Arsenic Research Articles

Catalytic effect of pyrite on the leaching of arsenopyrite in sulfuric acid and acid culture medium

In this study, the influence of pyrite on the leaching of arsenopyrite in sulfuric acid and iron-free 9K medium was investigated by leaching experiments and electrochemical analysis. During acid leaching, the addition of pyrite resulted in the further oxidation of arsenopyrite, for the reason that the galvanic interaction made the pH increase and redox potential decrease, and then the formation of arsenate precipitates with high crystallinity was depressed. While leaching in iron-free 9K medium, the buffer action keeping the pH stable promoted arsenopyrite dissolution as compared with acid leaching. And the addition of pyrite facilitated the arsenic extraction, but increasing the amount of pyrite added had no distinct impact on the further leaching of arsenopyrite. Electrochemical studies revealed that the presence of pyrite increased the conductivity of electrodes and electrolytes, verifying the catalytic effect of galvanic interaction on arsenopyrite leaching. Additionally, in the sulfuric acid electrolyte, the addition of pyrite also decreased the thickness of passivation layer on the arsenopyrite surface, confirming that the formation of ferric arsenate precipitates with high crystallinity was inhibited in the presence of pyrite. Therefore, the pyrite-promoted arsenopyrite oxidation in sulfuric acid was due to the galvanic effect and the control of pH and redox potential, whereas that in culture medium was only associated with the galvanic effect. Moreover, the electrochemical measurements also showed that the oxidation of elemental sulfur was the rate controlling step for arsenopyrite dissolution.

Identification of a Proper Phytoavailable Arsenic Extraction Method Associated with Arsenic Concentration in Edible Part of three Crops in Soils Near Abandoned Mining Areas

This study aimed to investigate correlations between concentrations of extractable Arsenic (As) with varying chemical solutions (0.1 M <TEX>$Ca(NO_3)_2$</TEX>, 0.1 M <TEX>$(NH_4)2HPO_4$</TEX>, 0.5 M EDTA, Mehlich 3, and 0.5 M <TEX>$NaHCO_3$</TEX>) and those of As in crops, and then to seek the most suitable soil extraction method for predicting the potential of As uptake in crops cultivated in soils contaminated with As. For a mesocosm experiment, pepper (Capsicum annuum L.), soybean (Glycine max L.), and rice (Oryza sativa L.) were cultivated for three months in pots containing soils taken from the arable areas near abandoned mines in Korea. Following the cultivation, soil pH and DOC significantly increased by treatments of lime and lime plus compost, respectively, while insignificant influences in changing total and all extractable As concentrations were found in all soils. Arsenic concentration in edible part of all crops considerably depended on the extractable As concentration in the soils, particularly with Mehlich 3. All extractable As concentrations in the soils of C. annuum and G. max were significantly correlated with As concentration in their edible parts. For O. sativa, the extractable concentrations of Mehlich 3 (<TEX>$R^2$</TEX>: 0.18 at p: 0.006) and EDTA (<TEX>$R^2$</TEX>: 0.11 at p: 0.036) showed only marked relationships with As concentration in the edible part. These results may indicate that the Mehlich 3 and EDTA are soil extractants to determine phytoavailable As in soil that provide better prediction for As transfer from soil to crop.

An Environmentally Benign Approach for As (V) Absorption from Wastewater Using Untreated Coffee Grounds—Preliminary Results

Arsenic contamination of water is a worldwide issue due to its severe effects on the human body. Coffee grounds are a porous material with network structures, making it absorb other substances such as some gases or elements. In this research, renewable coffee wastes were used as an adsorbent to extract arsenic (As) from wastewater. In order to evaluate the usefulness of untreated coffee grounds, a series of preliminary tests for attachment of arsenic to coffee grounds were provided. The Brunauer–Emmett–Teller (BET) surface area and adsorption–desorption isotherms of an untreated coffee ground obtained from N2 gas adsorption were provided, and pore sizes was obtained using Barrett–Joyner–Halenda (BJH) method. The adsorption capacities of the coffee waste were verified through a series of experimental processes changing the conditions such as concentration of arsenic, initial amount of coffee grounds, and pH. The maximum absorption concentration of 6.44 mg/L on 1 g of coffee grounds at 1.00 mM of arsenic solution was observed. It was demonstrated that the modification by the cation species or pretreatment processes, such as calcination, will be necessary to enhance the absorption capacity for the extraction of arsenic.

Selective, Photoenhanced Trapping/Detrapping of Arsenate Anions Using Mesoporous Blobfish Head TiO2 Monoliths

The efficient and low-cost adsorption of arsenic toxins from drinking water is a global concern because of its adverse health effects. The simple extraction and eco-friendly environmental waste management of arsenic(V) species using hierarchy rutile TiO2 were reported. Mesoporous microscale TiO2 sphere 3D monoliths were successfully fabricated with uniform mesopores morphology-like blobfish head containing open nanoscale eyes through hydrothermal one-pot synthesis. The blobfish head TiO2 (BHT) was mainly oriented along the predominant {110} facet and with dense top-surface atomic Ti4+ and O2– sites along the crystal edge surface and central crystals. These characteristics lead to efficient adsorption and selective binding to As(V) species in acidic medium. The photoinduced irradiation of the BHT adsorbent promoted significant trapping and high adsorptivity, with a maximum capacity reaching 125 mg/g from drinking water. The BHT adsorbent selectively binds As(V) species among competitive anions, such as chl...

Speciation analysis of six arsenic species in marketed shellfish: Extraction optimization and health risk assessment

A comparative study between microwave assisted and sonication methods was carried out to extract arsenic (As) species in shellfish samples using different extractants. Six As species including arsenite [As(III)], arsenate [As(V)], monomethylarsonic acid (MMA), dimethylarsinic acid (DMA), arsenobetaine (AsB) and arsenocholine (AsC) were simultaneously separated and determined by the HPLC–ICP-MS method. The microwave assisted method exhibited higher efficiency than sonication, especially using diluted HNO3 as extractant. By compromising extraction efficiency, pretreatment time and stability of As species, the microwave assisted method using 1% HNO3 at 100°C for 1.5h was selected to extract As from real samples. The proposed method has been applied to extract and determine As species in shellfish samples. The result of correlation analysis indicated that the proportion of AsB in the shellfish samples was decreased with total As concentration increasing due to the biotransformation threshold from inorganic As to AsB.

Separation of arsenic from hazardous As-bearing acidic leached zinc plant purification filter cake selectively by caustic baking and water leaching

In the present study, a process for complete and selective separation of arsenic from As-bearing acidic leached zinc plant hot purification filter cake (ALZPHPFC) over impurities mainly zinc and lead was examined so that by decreasing the weight percentage of arsenic in ALZPHPFC environmental problems would be eliminated and dumped safely. In this line, using either NaOH or NaOH-H2O2, ALZPHPFC was first treated through direct alkaline leaching (DAL) process. DAL process failed to leach satisfactory amount of arsenic from ALZPHPFC, and also selective arsenic extraction over zinc and lead through DAL process was not feasible. Therefore, caustic baking and subsequently water leaching process was applied to examine the possibility of satisfactory and selective arsenic extraction. Investigation of the effect of all parameters showed that only NaOH/ALZPHPFC wt. ratio and baking temperature and time made significant changes on metal extraction, and by increasing the mentioned parameters, arsenic extraction via caustic baking process improved. So hydroxide anions in media, and consequently zinc and lead extraction decreased in higher baking temperature and time. But at higher NaOH/ALZPHPFC wt. ratio zinc and lead extraction increased because of higher filtrate pH. The results have indicated that almost all of arsenic could be extracted selectively from ALZPHPFC when it was baked for 4h at 600°C with a NaOH/ALZPHPFC wt. ratio of 1.

Speciation of As(ΙΙΙ)/As(V) and Total Inorganic Arsenic in Biological Fluids Using New Mode of Liquid-Phase Microextraction and Electrothermal Atomic Absorption Spectrometry.

In this paper, a new extraction method based on countercurrent liquid-liquid microextraction (CLLME) has been developed for the extraction and preconcentration of inorganic arsenic (iAs) in plasma and urine samples prior to their analysis by electrothermal atomic absorption spectrometry (ETAAS). In this method, firstly, 5ml of water is added to the extraction vessel. Then 30.0μl of the extracting solvent is added to it in order for the extracting solvent to be placed in the narrow-necked vessel. In total, 10ml of a standard solution or a pretreated real sample is added to the sample container and it is connected to the extraction vessel via a connector. While opening the embedded valve at the bottom of the sample container and the one in the extraction vessel, the sample solution flows into the extracting solvent with the same flow rate, leading to the successful extraction of metal ligand into the extracting organic solvent. Under the optimum conditions, calibration curves are linear in the range of 0.1-50μgl-1, and limit of detections (LODs) are in the range of 0.03-0.05μgl-1. The enhancement factor and enrichment factor were in the range of 220-240 and 198-212, respectively. Repeatability (intra-day) and reproducibility (inter-day) of method based on seven replicate measurements of 5.0μgl-1 of arsenic were in the range of 2.3-3.5% and 4.0-5.7%, respectively. The applicability of the proposed CLLME and ETAAS methods was demonstrated by analyzing the iAs in spiked urine and plasma samples. The obtained recoveries of the arsenic in the range of 92-107% indicated the excellent capability of the developed method for speciation of arsenic from plasma and urine samples. Graphical Abstract ᅟ.

Biooxidation of a High-Grade Arsenopyritic Gold Ore Using a Mixed Culture of Moderate Thermophilic Microorganisms

This study investigated the biooxidation of a high-grade refractory gold ore from the Zarshouran mine (West Azarbaijan, Iran) in shake flasks and a stirred tank bioreactor (STBR) using a mixed culture of moderately thermophilic microorganisms. The influence of four critical parameters including, pH, biooxidation time, nutrient medium type and pulp density on the iron and arsenic extraction as well as gold cyanidation were evaluated in a full factorial design in shake flasks at 45 °C. Maximum iron extraction was obtained in M9K medium, pulp density of 5% (w/v), 15 days of biooxidation time and the pH of 1.6. Biooxidation in the STBR was carried out at the pulp densities of 10% and 20% (w/v), the pH of 1.7 in the M9K medium, in which dissolved oxygen, pH, redox potential, iron and arsenic concentrations were measured during the process. It was found that 61% decrement of sulphur content in the STBR led to recover 80% of gold, which was 43% higher than that in the conventional cyanidation process. It can be concluded that the oxidation of refractory arsenopyrite gold ore can achieved using a moderately thermophilic biooxidation culture.

Bioleaching of arsenopyrite by mixed cultures of iron-oxidizing and sulfur-oxidizing microorganisms

Arsenic is a critical environmental pollutant associated with acid mine drainage. Arsenopyrite is one of the major arsenic sulfide minerals whose weathering lead to the contamination of arsenic. In this study, the leaching behaviors of arsenopyrite by two mixed cultures of iron-oxidizing and sulfur-oxidizing microorganisms (Ferroplasma thermophilum and Acidithiobacillus caldus, Sulfobacillus thermosulfidooxidans and Acidithiobacillus caldus) were investigated, accompanying with community structure analysis of free microorganisms. The ratio of F. thermophilum to A. caldus of 1/1 showed a more favorable effect on the arsenic leaching than other ratios, and F. thermophilum played a dominant role in the solution all the leaching time. While adding A. caldus in the S. thermosulfidooxidans bioleaching system, the dissolution of arsenopyrite was suppressed. Notably, when the ratio of S. thermosulfidooxidans to A. caldus was 2/1, the arsenic extraction was accelerated at the early stage, but later it slowed down. The reason was because A. caldus was the predominant species at the later stage which made the redox potential decrease faster. XRD demonstrated that the proper addition of A. caldus could eliminate the sulfur passivation and promote the leaching in a degree. These studies are helpful to evaluate the environmental impact of arsenic.

Determination of inorganic arsenic in natural waters after selective extraction using Moringa oleífera seeds

Moringa oleifera seeds were used as a biosorbent for the selective extraction of inorganic arsenic in water and detection by furnace graphite atomic absorption spectrometry. The behavior of the As(III) and As(V) adsorption onto the biosorbent was evaluated at pH 1.0–9.0 in batch studies. The results indicated that As(III) was adsorbed at pH 7.0 while As(V) was poorly retained. So much, in a sample contained As(III) and As(V), the As(III) is going to be retained while most pentavalent species remained free in solution, allowing their determination by GF AAS. The operational variables of the separation method were optimized, the adsorbent mass of 1.0g was found to be sufficient to retain the As(III) present in the solutions with a stirring time of 1h. The limit of detection for As(V) determination is 6.3μgL−1 and the precision was below 1.23%. Results for recovery tests using different water samples were higher than 92% As(V). The accuracy of the method was proven through the analysis of a certified water sample (APS 1071).

The Effects of Solution Concentration, Drying, Aging Time, and Mixture of Goethite with As(V)-Fe(OH)3 on the Chemical Extraction of Arsenate Associated with Iron (Hydr)oxides

Extraction of arsenic (As) from adsorbed (ad) and coprecipitated (cpt) As-Fe(OH)3, As-Fe3O4 using phosphate buffer, sodium hydroxide (NaOH), hydrochloric acid (HCl), and oxalate buffer was studied. In addition, the effects of the solution concentrations, sample drying, aging time, and goethite and fresh As-Fe(OH)3 (cpt) mixture on the extraction efficiencies of As were investigated. For fresh As-Fe(OH)3 (ad) and As-Fe(OH)3 (cpt), 100% of the As was extracted by either 1 mol/L (M) phosphate (pH 5.0) or 0.5 M NaOH. Lower As recoveries from As-Fe(OH)3 associations were obtained by lower concentrations of phosphate (pH 5.0, 0.05 and 0.1 M) and NaOH (0.1 M). Drying and aging of the As-Fe (hydr)oxide associations significantly inhibited the extraction ratio and rate of adsorbed and coprecipitated As relative to fresh samples. The slow intraparticle diffusion of phosphate and arsenate in aggregated or crystalized As-bearing Fe (hydr)oxide particles is possibly the dominant cause. Due to readsorption of As onto goethite, the coexistence of goethite with fresh As-Fe(OH)3 (cpt) resulted in an incomplete release of As (∼70%) with either 1 M HCl or 0.2 M oxalate (pH 3.25). However, when a mixture of 0.1 M phosphate and 1 M HCl was used, 100% of the As was recovered, indicating that the addition of a small amount of phosphate into the HCl or oxalate solutions is helpful to completely extract all of the As coprecipitated with amorphous Fe (hydr)oxides.

Electrochemical detoxification and recovery of spent SCR catalyst by in-situ generated reactive oxygen species in alkaline media

An environmental friendly electrochemical detoxification and recovery process is developed for the spent SCR catalysts disposal under alkaline condition. It is revealed that the spent V2O5-WO3/TiO2 catalyst is severely aggregated and poisoned by arsenic compounds. In this study, the efficient removal of arsenic is achieved by the electrochemical advanced oxidation processes (EAOPs) at surface-modified carbon felt cathode, where the HO2− and highly oxidative OH are in-situ generated from two-electron ORR and electro-Fenton-like reaction, respectively. The mechanism of electrochemical arsenic extraction is systematically illustrated by employing the ESR measurements, and vanadium species induced electro-Fenton-like reaction is proposed. After electro-oxidative dissolution, the crystal structure and original composition of the catalyst support (TiO2 and WO3) are well maintained for recycle or subsequently re-fabrication process. After dipping active component on the detoxified catalyst, the regenerated catalyst shows a comparable SCR catalytic activity with the fresh sample. The present electrochemical strategy provides a promising approach for the spent catalysts utilization and further understanding for the in-situ generated reactive oxygen species in alkaline media.

Chemical Speciation and Health Risk Assessment of Fine Particulate Bound Trace Metals Emitted from Ota Industrial Estate, Nigeria

In this study carcinogenic and non-carcinogenic health risk due to exposure to PM2.5-bound trace metals from an industrial area in Southwestern Nigeria was estimated. A four-step chemical sequential extraction procedure was employed for the chemical extraction of arsenic (As), cadmium (Cd), chromium (Cr) copper (Cu), manganese (Mn), nickel (Ni), and zinc (Zn). Samples were analyzed using inductively coupled plasma mass spectrometry (ICP-MS). Results reveal Cr and Cu as the most dominant exchangeable fraction metals, indicating possibility of their being readily soluble once PM2.5 is inhaled. Cd and Cr record the highest bioavailability index of 0.7. The cumulative lifetime cancer risks due to inhalation exposure for adults (4.25×10-2), children 1-6 years old (4.87×10-3), and children 6-18 years old (1.46×10-2) were found above Environmental Protection Agency’s acceptable range of 1×10-6 to 1×10-4. The hazard index values for all studied trace metals suggest significant potential for non-carcinogenic health risks to adults and children. The choice of chemical speciation as an essential tool in facilitating a better predictive insight on metal bioavailability and toxicity for immediate remediation action has been highlighted.

A Magnetized Nanoparticle Based Solid-Phase Extraction Procedure Followed by Inductively Coupled Plasma Atomic Emission Spectrometry to Determine Arsenic, Lead and Cadmium in Water, Milk, Indian Rice and Red Tea.

A sensitive and simple method using magnetic multi-walled carbon nanotube (MWCNTs-Fe3O4 MNP), as the adsorbent, has been successfully developed for extraction and pre-concentration of arsenic, lead and cadmium with detection by inductively coupled plasma-atomic emission spectroscopy (ICP-AES). The nanosorbent was characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction pattern (XRD), vibrating sample magnetometer (VSM) and transmission electron microscopy (TEM). The key factors affecting the signal intensity such as pH, adsorbent amount, etc. were investigated. Under optimal conditions, the limits of detection (three-time of signal to noise ratio, S/N 3) were 0.3, 0.6, 0.3ng/mL for arsenic, lead and cadmium, respectively. Application of the adsorbent was investigated by the analysis of water, milk, Indian rice and red tea. The experimental data was analyzed and obeyed Langmuir and Freundlich adsorption models. The kinetic data was fitted to the pseudo-second-order model. Thermodynamic studies revealed the feasibility and exothermic nature of the system.

Natural product based composite for extraction of arsenic (III) from waste water

Natural based composites of hydroxyapatite/Gum Arabic designed for removal of toxic metal arsenic (III) from waste water were synthesized and evaluated. Several composites with various compositions were prepared by the wet chemical method and analyzed using various spectroscopic and analytical methods such as: Fourier transform infrared spectroscopy, total organic carbon production, XRD analysis and scanning electron microscope. The rates of weight loss and water absorption of the HAp/GA composites as a function of time were evaluated in phosphate-buffered saline solution at 37 °C and a pH of 7.4. The effects of several variables on adsorption of arsenic (III) by HAp/GA composites were evaluated. The variables include arsenic (III) concentration, contact time (t) and complex surface nature of HAp/GA composite. Three surface complexation models were used to study the mechanisms controlled the adsorption. The models were Langmuir, Freundlich and Dubinin Radushkevich. The adsorption kinetic of arsenic (III) on the composite surface was described by three modes: pseudo first order, pseudo second order and the intra particle diffusion. The results revealed that, the rate of adsorption of arsenic (III) by HAp/GA composites was controlled by two main factors: the initial concentration of arsenic (III) and the contact time. The kinetic studies also showed that, the rate of adsorption is a second order. The results indicate that, composite offered in this study could be a valuable tool for removing toxic metals for contaminated water by adsorption.Graphical abstract.

Study of arsenic sedimentation from copper electrolyte with pseudobrookite

The article presents the results of experimental cleaning of copper manufacture solutions from arsenic with pseudobrookite (Fe2TiO5). The stochastic-determined design of experiment at four levels was used to study the properties of pseudobrookite as an arsenic precipitator in copper sulphuric acid solutions. The following variable factors were selected: frequency rate of precipitator dispensing: 1–4; precipitator-to-arsenic ratio (Fe2TiO5 : As): (1÷2,5):1; process temperature (t, °C): 25–60; sulfuric acid concentration (H2SO4 g/l); 120–200; experiment duration (time, minutes): 15-60. The process of arsenic sedimentation from copper electrolyte was studied using the process solution of Kazakhmys Corporation LLC (Balkhash) with the following component contents, g/l: 50,7 Cu; 7,75 Ni; 9,83 As; 200,0 H2SO4, etc. X-ray and IR spectroscopy identified and confirmed the presence of arsenate ion in the solid sediment composition as a complex compound of iron hydroxysulphate arsenate and iron pyroarsenate. The plots of arsenic sedimentation rate versus studied factors were made to determine significant parameters (precipitator-to-arsenic ratio, working solution temperature and experiment duration) that determine the efficiency of arsenic extraction to a solid phase with pseudobrookite. The generalized formula for the mathematical dependence of the degree of arsenic sedimentation with pseudobrookite on the process conditions (Protodyakonov equation) was calculated. Optimal conditions for the process of copper electrolyte purification were determined where over 60 % of arsenic is extracted to the sediment. A new method for copper electrolyte cleaning from arsenic with pseudobookite was developed.

Synergistic effects of the combination of oxalate and ascorbate on arsenic extraction from contaminated soils

Arsenic is often associated with iron oxides in soils due to its high affinity with iron oxides and the abundance of iron oxides in the environment. Dissolution of iron oxides can subsequently release arsenic associated with them into the environment, which results in the increase of arsenic mobility in the soil environment. In this study, arsenic extraction from soils via the dissolution of iron oxides was investigated using oxalate, ascorbate, and their combination in order to effectively remediate arsenic-contaminated soils. Oxalate mainly extracted iron from soils via a ligand-promoted reaction, while ascorbate extracted iron mainly via a reductive reaction. Arsenic extractions from soils by oxalate and ascorbate were shown to behave similarly to iron extractions, indicating the concurrent release of arsenic adsorbed on iron oxides upon the dissolution of iron oxides. The combination of oxalate and ascorbate greatly increased arsenic extraction, indicating the synergistic effects of the combination of oxalate and ascorbate on iron and arsenic extraction from soils. Oxalate and ascorbate are naturally-occurring organic reagents that have chelating and reducing capacity. Therefore, the use of oxalate and ascorbate is environmentally friendly and effective for the remediation of arsenic-contaminated soils.

Total Arsenic and Arsenic Species in Seaweed and Seafood Samples Determined by Ion Chromatography Coupled with Inductively Coupled End‐on‐Plasma Atomic Emission Spectrometry

An analytical method was developed for the extraction and determination of total arsenic and arsenic species in seafood by ion chromatography coupled with end‐on‐plasma atomic emission spectrometry. Sample preparation included a selective extraction method, and the optimization for separation and detection of arsenic species was performed by important instrumental and methodological parameters. The lack of loss or transformation of arsenic species in samples was also confirmed with the analytical method. Good recovery efficiency (98.2 ~ 99.1%) was obtained for the arsenic species with the selected extraction method. In this study, several kinds of seafood (snow crab, red snow crab, octopus, octopus minor, and squid) and seaweed (red laver, green laver, sea tangle, sea mustard, and hizikia) were investigated with the analytical method. All samples were first dried and ground to fine powder before use. The main arsenic species found in these seafoods was non‐toxic arsenobetain (AsB). Its highest concentration was found in red snow crab samples (152 ± 4 mg/kg, dry weight). Other arsenic species (As3+, As5+, monomethylarsonic acid [MMA] and dimethylarsinic acid [DMA]) were not detected in these seafood samples. The major arsenic species found in hizikia samples was As5+. Its concentration was 34.0 ± 0.4 mg/kg (dry weight). Arsenic species (As3+, As5+, MMA, DMA, and AsB) were not found in green laver, sea tangle, red laver, or sea mustard samples.

Extraction and determination of arsenic species in leafy vegetables: Method development and application

Extraction of arsenic (As) species in leafy vegetables was investigated by different combinations of methods and extractants. The extracted As species were separated and determined by HPLC-ICP-MS method. The microwave assisted method using 1% HNO3 as the extractant exhibited satisfactory efficiency (>90%) at 90°C for 1.5h. The proposed method was applied for extracting As species from real leafy vegetables. Thirteen cultivars of leafy vegetables were collected and analyzed. The predominant species in all the investigated vegetable samples were As(III) and As(V). Moreover, both As(III) and As(V) concentrations were positive significant (p<0.01) correlated with total As (tAs) concentration. However, the percentage of As(V) reduced with tAs concentration increasing probably due to the conversion and transformation of As(V) to As(III) after uptake. The hazard quotient results indicated no particular risk to 94.6% of local consumers. Considerably carcinogenic risk by consumption of the leafy vegetables was observed.

Potential of Chitosan (Chemically Modified Chitin) for Extraction of Lead-Arsenate Contaminated Soils

ABSTRACTArsenic, lead, and phosphorous contamination in soils represents a health risk. Chitosan (poly-N-acetyl glucosamine) inexpensive by-product derived from chitin has been used as a metals adsorbent. Objectives of this research were to evaluate the effectiveness of chitosan solution for arsenic, lead, and phosphorous extraction from lead-arsenate contaminated soils, and evaluate the effectiveness of protonated chitosan flakes (PCF) and ferric hydroxide chitosan beads (Fe(III)-CB) for water-soluble As removal from these soils. Percentage of arsenic, lead, and phosphorous removed from the soils by chitosan solution ranged from 0.96% to 17%, 1.80% to 31%, and 0.66% to 11%, respectively. Percentage of water-soluble arsenic removed by PCF and by Fe (III)-CB ranged from 12% to 47% and 36% to 77%, respectively. Averaged over soils, Fe (III)-CB removed slightly more arsenic (As) (42 mg kg−1) compared to Mehlich III (40 mg kg−1) extractant. Results indicate potential for the use of chitosan as an extraction for lead-arsenate contaminated soils.