Enhanced transformation of diphenylarsinic acid in soil under sulfate-reducing conditions

Guan, Ling; Hisatomi, Shihoko; Fujii, Kunihiko; Nonaka, Manabu; Harada, Naoki

doi:10.1016/j.jhazmat.2012.09.054

Cited by 15 publications

(12 citation statements)

References 37 publications

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“…1A and B, Table S2) and this may be attributed to SRB activity as first reported by Guan et al (2012). DPTAA was a major metabolite of DPAA in sulfide soil and this is consistent with previous results reported by Hisatomi et al (2013).…”

Section: Impact Of Sulfate and Fe(iii) Reduction On Dpaa Thionationsupporting

confidence: 91%

“…Sodium lactate and sodium sulfate were added as exogenous carbon and sulfur sources at concentrations of 142 μg C g −1 and 426 μg S g −1 (dry soil basis), respectively, for sulfide incubation. The methods and conditions of preparing the sulfide slurry were modified according to Guan et al (2012). After two weeks of pre-incubation at 25°C in the dark the bottles were spiked with DPAA at 30 mg kg −1 (dry soil basis) with a sterile syringe.…”

Section: Soil Incubation Experimentsmentioning

confidence: 99%

“…Sulfide derived from microbial sulfate reduction can react directly with As to form soluble thioarsenate species or insoluble precipitates when substantial amounts of dissolved As and sulfide are present (Root et al, 2013;Stucker et al, 2014;Xu et al, 2011). Limited studies also show that DPAA can be rapidly dephenylated or methylated under flooded soil conditions (Maejima et al, 2011;Arao et al, 2009) and thionation is an important anaerobic pathway for DPAA under sulfate-reducing conditions (Guan et al, 2012;Hisatomi et al, 2013). However, the partitioning of DPAA in flooded soil was underestimated.…”

Section: Introductionmentioning

confidence: 99%

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Solid-solution partitioning and thionation of diphenylarsinic acid in a flooded soil under the impact of sulfate and iron reduction

Zhu

et al. 2016

Science of The Total Environment

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• We first investigated the solid-solution partitioning of DPAA in a flooded soil.• We first examined the impacts of sulfate and iron reduction on DPAA partitioning.• Elevated DPAA mobilization and thionation was observed in sulfide soil.• DPAA mobilization associated with Fe(III) reductive dissolution was demonstrated.• Enhanced mobilization of DPAA and sulfate reduction promoted DPAA thionation. Editor: Jay Gan Diphenylarsinic acid (DPAA) is a major organic arsenic (As) compound derived from abandoned chemical weapons. The solid-solution partitioning and transformation of DPAA in flooded soils are poorly understood but are of great concern. The identification of the mechanisms responsible for the mobilization and transformation of DPAA may help to develop effective remediation strategies. Here, soil and Fe mineral incubation experiments were carried out to elucidate the partitioning and transformation of DPAA in anoxic (without addition of sulfate or sodium lactate) and sulfide (with the addition of sulfate and sodium lactate) soil and to examine the impact of sulfate and Fe(III) reduction on these processes. Results show that DPAA was more effectively mobilized and thionated in sulfide soil than in anoxic soil. At the initial incubation stages (0-4 weeks), 6.7-74.5% of the total DPAA in sulfide soil was mobilized likely by sorption competition with sodium lactate. At later incubation stage (4-8 weeks), DPAA was almost completely released into the solution likely due to the near-complete Fe(III) reduction. Scanning transmission X-ray microscopy (STXM) results provide further direct evidence of elevated DPAA release coupled with Fe(III) reduction in sulfide environments. The total DPAA fraction decreased significantly to 24.5% after two weeks and reached 3.4% after eight weeks in sulfide soil, whereas no obvious elimination of DPAA occurred in anoxic soil at the initial two weeks and the total DPAA fraction decreased to 10.9% after eight weeks. This can be explained in part by the enhanced mobilization of DPAA and sulfate reduction in G R A P H I C A L A B S T R A C T a b s t r a c t a r t i c l e i n f o Contents lists available at ScienceDirectScience of the Total Environment j o u r n a l h o m e p a g e : w w w . e l s e v i e r . c o m / l o c a t e / s c i t o t e n v sulfide soil compared with anoxic soil. These results suggest that under flooded soil conditions, Fe(III) and sulfate reduction significantly promote DPAA mobilization and thionation, respectively, and we suggest that it is essential to consider both sulfate and Fe(III) reduction to further our understanding of the environmental fate of DPAA.

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Section: Impact Of Sulfate and Fe(iii) Reduction On Dpaa Thionationsupporting

confidence: 91%

Section: Soil Incubation Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Solid-solution partitioning and thionation of diphenylarsinic acid in a flooded soil under the impact of sulfate and iron reduction

Zhu

et al. 2016

Science of The Total Environment

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“…They isolated three bacterial strains that could directly degrade DPAA at low concentrations (5-10 mg/L). Guan et al (2012a) also found the transformation of DPAA in soils can be enhanced under sulfate-reducing conditions. However, the process was time-consuming and most of DPAA was transformed only into other organic forms, with no detailed report on the detail yield of inorganic arsenics.…”

Section: Introductionmentioning

confidence: 84%

Diphenylarsinic acid contaminated soil remediation by titanium dioxide (P25) photocatalysis: Degradation pathway, optimization of operating parameters and effects of soil properties

Wang

Teng

et al. 2016

Science of The Total Environment

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Diphenylarsinic acid (DPAA) is formed during the leakage of arsenic chemical weapons in sites and poses a high risk to biota. However, remediation methods for DPAA contaminated soils are rare. Here, the photocatalytic oxidation (PCO) process by nano-sized titanium dioxide (TiO 2 ) was applied to degrade DPAA in soil. The degradation pathway was firstly studied, and arsenate was identified as the final product. Then, an orthogonal array experimental design of L 9 (3) 4 , only 9 experiments were needed, instead of 81 experiments in a conventional one-factor-at-a-time, was used to optimize the operational parameters soil:water ratio, TiO 2 dosage, irradiation time and light intensity to increase DPAA removal efficiency. Soil:water ratio was found to have a more significant effect on DPAA removal efficiency than other properties. The optimum conditions to treat 4 g soil with a DPAA concentration of 20 mg kg −1 were found to be a 1:10 soil: water ratio, 40 mW cm −2 light intensity, 5% TiO 2 in soil, and a 3-hour irradiation time, with a removal efficiency of up to 82.7%. Furthermore, this method (except for a change in irradiation time from 3 to 1.5 h) was validated in nine different soils and the removal efficiencies ranged from 57.0 to 78.6%. Removal efficiencies were found to be negatively correlated with soil Contents lists available at ScienceDirectScience of the Total Environment j o u r n a l h o m e p a g e : w w w . e l s e v i e r . c o m / l o c a t e / s c i t o t e n v electrical conductivity, organic matter content, pH and total phosphorus content. Finally, coupled with electron spin resonance (ESR) measurement, these soil properties affected the generation of OH• by TiO 2 in soil slurry. This study suggests that TiO 2 photocatalytic oxidation is a promising treatment for removing DPAA from soil.

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“…Several bacterial strains able to degrade DPAA directly have been isolated [6,11,12]. In addition, the transformation of PAA and DPAA can be enhanced by indigenous microorganisms under sulfate-reducing conditions [4,13]. However, these bioremediation methods cannot degrade DPAA but only transform it into other organic forms and they are time-consuming.…”

Section: Introductionmentioning

confidence: 99%

Photodegradation of diphenylarsinic acid by UV-C light: Implication for its remediation

Wang

Teng

et al. 2016

Journal of Hazardous Materials

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Enhanced transformation of diphenylarsinic acid in soil under sulfate-reducing conditions

Cited by 15 publications

References 37 publications

Solid-solution partitioning and thionation of diphenylarsinic acid in a flooded soil under the impact of sulfate and iron reduction

Solid-solution partitioning and thionation of diphenylarsinic acid in a flooded soil under the impact of sulfate and iron reduction

Diphenylarsinic acid contaminated soil remediation by titanium dioxide (P25) photocatalysis: Degradation pathway, optimization of operating parameters and effects of soil properties

Photodegradation of diphenylarsinic acid by UV-C light: Implication for its remediation

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