Quantity and Speciation of Arsenic in Soils by Chemical Extraction

Loeppert, Richard H.; Jain, Archana; El-Haleem, M. A. A.; Biswas, Biplab; Cai, Yong; Braids, O. C.

doi:10.1021/bk-2003-0835.ch004

Cited by 15 publications

(17 citation statements)

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“…It is the arsenic in these fractions which is more bioavailable and therefore of greater importance for risk assessment and management. Phosphate solutions have been widely used as an extraction medium for soil arsenic (Loeppert et al, 2002;Manning and Martens, 1997). Extraction of arsenic with phosphate is through ligand exchange that involves the desorption of arsenic by phosphate.…”

Section: Introductionmentioning

confidence: 99%

“…Phosphate provides a number of benefits as a choice for chemical speciation of arsenic. It shares many similar chemical properties to arsenate such as ion size and acid dissociation constants (Cai and Braids, 2003;Loeppert et al, 2002) and provides a mild extraction medium which is similar to environmental conditions. Phosphate was therefore selected as the primary extractant for arsenic speciation for soil and sediment in this study.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, we selected a mild extraction media, i.e. phosphate solution (Loeppert et al, 2002). Other additives including ethylenediaminetetraacetic acid (EDTA), NH 2 OH·HCl, and sodium diethyldithiocarbamate trihydrate (NaDDC) were evaluated in combination with the phosphate solution to determine whether or not they improved arsenic species recoveries.…”

Section: Introductionmentioning

confidence: 99%

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Extraction of arsenate and arsenite species from soils and sediments

Georgiadis

Cai

Solo‐Gabriele

2006

Environmental Pollution

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The primary objective of this study was to develop a simple method that can be used to extract the more readily mobilizable and bioavailable arsenic species from soil and sediment while at the same time minimizing the transformation between (As III ) and (As V ), the two most commonly found arsenic species in the environment. Several extraction strategies were evaluated using phosphate as extractant in combination with either ethylenediaminetetraacetic acid (EDTA), hydroxylamine hydrochloride (NH 2 OH·HCl), or sodium diethyldithiocarbamate trihydrate (NaDDC).The addition of EDTA in the phosphate solution did not prevent As III from oxidation. While promising results were shown when 1% NH 2 OH·HCl was added, conversion of As III began to occur with extended extraction time (>12 h). Good results were achieved using 10 mM phosphate and 0.5% NaDDC where As III oxidation was clearly minimized. The combined phosphate and NaDDC solution was applied to several soil and sediment samples. As III spiked was quantitatively recovered in all soil types tested.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Extraction of arsenate and arsenite species from soils and sediments

Georgiadis

Cai

Solo‐Gabriele

2006

Environmental Pollution

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“…A mild extraction media of phosphate solution [18] and sodium diethyldithiocarbamate trihydrate (NaDDC) were used as extractants. The supernatant solution was filtered through a 0.45 µm PVDF Acrodisc ® syringe (Pall Corp., Port Washington, NY, USA) filter into a 2 mL HPLC vial and was immediately analyzed using the HG-AFS technique with the Millennium Excalibur system.…”

Section: Arsenic Speciationmentioning

confidence: 99%

Hydrogeochemistry of Groundwater and Arsenic Adsorption Characteristics of Subsurface Sediments in an Alluvial Plain, SW Taiwan

et al. 2016

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Many studies were conducted to investigate arsenic mobilization in different alluvial plains worldwide. However, due to the unique endemic disease associated with arsenic (As) contamination in Taiwan, a recent research was re-initiated to understand the transport behavior of arsenic in a localized alluvial plain. A comprehensive approach towards arsenic mobility, binding, and chemical speciation was applied to correlate groundwater hydrogeochemistry with parameters of the sediments that affected the As fate and transport. The groundwater belongs to a Na-Ca-HCO 3 type with moderate reducing to oxidizing conditions (redox potential = −192 to 8 mV). Groundwater As concentration in the region ranged from 8.89 to 1131 µg/L with a mean of 343 ± 297 µg/L, while the As content in the core sediments varied from 0.80 to 22.8 mg/kg with a mean of 9.9 ± 6.2 mg/kg. A significant correlation was found between As and Fe, Mn, or organic matter, as well as other elements such as Ni, Cu, Zn, and Co in the core sediments. Sequential extraction analysis indicated that the organic matter and Fe/Mn oxyhydroxides were the major binding pools of As. Batch adsorption experiments showed that the sediments had slightly higher affinity for As(III) than for As(V) under near neutral pH conditions and the As adsorption capacity increased as the contents of Fe oxyhydroxides as well as the organic matter increased.

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“…It is therefore important that methods of extraction be developed that are capable of extracting a sufficient quantity of the available arsenic, while maintaining the chemical integrity of the original species. There are many extraction procedures to evaluate metal availability in soils, [10][11][12][13][14] which can be divided into two groups: sequential extraction and simple extraction. Both procedures are time-consuming because they need long mechanical shaking times.…”

Section: Introductionmentioning

confidence: 99%

Extraction of arsenic species from spiked soils and standard reference materials

Kahakachchi

Uden

Tyson

2004

Analyst

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The abilities of various extractants to recover four arsenic species [As(III), As(V), dimethylarsinic acid (DMA), and monomethylarsonic acid (MMA)] from soils spiked with 20 mg g 21 As were investigated. The extractants were water, buffer solutions (citrate and ammonium dihydrogen phosphate), acidic solutions (phosphoric acid and acetic acid), a basic solution (sodium hydroxide) and household chemicals (vinegar and Coca Cola). Gentle shaking at room temperature with each extractant for 24 h gave different recoveries for the different arsenic species. With 0.1 M NaOH solution 46% As(III), 53% DMA, 100% MMA and 84% As(V) were recovered. A rapid extraction procedure using a sonicator probe has been developed to obtain higher extraction efficiencies. Extracts of arsenic-spiked soil, SRM 2711 Montana soil and SRM 2709 San Joaquin soil were analyzed by HPLC-ICP-MS. In the SRM water extracts, DMA and MMA were identified in addition to inorganic arsenic. The solution detection limits (3s) were 0.1, 0.12, 0.13 and 0.15 ng mL 21 for As(III), DMA, MMA and As(V), respectively for HPLC-ICP-MS.

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Quantity and Speciation of Arsenic in Soils by Chemical Extraction

Cited by 15 publications

References 0 publications

Extraction of arsenate and arsenite species from soils and sediments

Extraction of arsenate and arsenite species from soils and sediments

Hydrogeochemistry of Groundwater and Arsenic Adsorption Characteristics of Subsurface Sediments in an Alluvial Plain, SW Taiwan

Extraction of arsenic species from spiked soils and standard reference materials

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