Mercury distribution and speciation in floodplain soils and uptake into native earthworms (Diplocardia spp.)

Han, Fengxiang X.; Su, Yachun; Shi, Zhiqi; Xia, Yunjun; Tian, Wushuang; Philips, Valerie; Monts, David L.; Gu, Mengmeng; Liang, Yongchao

doi:10.1016/j.geoderma.2011.11.010

Cited by 28 publications

(19 citation statements)

References 25 publications

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“…THg, especially MeHg, in earthworms has the potential for bio-magnification in natural food chains of earthworm predators, such as birds, reptiles, and oth-er invertebrates (Han et al, 2012). The results in this study indicated that the THg concentrations in B. parvus tissues in leachate-contaminated forest soils (1.242-6.775 mg kg -1 dw) were significantly higher than those in reference forest soils (0.350-0.490 mg kg -1 dw), and mean concentrations of MeHg in B. parvus tissues were similar to those in both the leachate-contaminated and uncontaminated sites (0.114 mg kg -1 dw and 0.104 mg kg -1 dw, respectively).…”

Section: Mercury Concentrations In Forest Soils and Native Earthwormsmentioning

confidence: 99%

Comparison of mercury and methylmercury bioaccumulation in earthworms (<i>Bimastus parvus</i>) native to landfill-leachate-contaminated forest soil

Arizono

Ji³

et al. 2018

J. Toxicol. Sci.

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Total mercury (THg) and methylmercury (MeHg) bioaccumulation was explored in the Bimastus parvus species of earthworm (B. parvus) native to the leachate-contaminated forest soils around a Hg-polluted traditional landfill in Japan. General soil properties and concentrations of THg and MeHg in forest soils and in B. parvus were determined. The results indicated that the average THg concentrations in B. parvus and in forest soils in the leachate-contaminated sites were 10.21 and 14.90 times higher than those in the reference sites, respectively, whereas similar average MeHg concentrations were observed in forest soils (< 0.01 mg kg) and in B. parvus (0.100-0.114 mg kg) across all sampled sites. The average bioaccumulation factors of THg in B. parvus (BAF) in forest soil were similar between the leachate-contaminated sites and the reference sites. Cluster and regression analyses demonstrated that the B. parvus Hg (THg and MeHg) and soil THg were positively correlated with each other and with soil organic matter (SOM) and clays, but were negatively correlated with sand and hardly correlated with silts and pH in leachate-contaminated forest soils. From these results, it was proposed that Hg exposure to food chains is possible through B. parvus, because B. parvus showed a high ability to accumulate THg and MeHg in both leachate-contaminated and reference forest soils. Together, these findings indicated that the role of B. parvus in MeHg production is not clear, and it is possible that the MeHg in B. parvus was firstly formed within forest soils and then accumulated in their tissues.

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Section: Mercury Concentrations In Forest Soils and Native Earthwormsmentioning

confidence: 99%

Comparison of mercury and methylmercury bioaccumulation in earthworms (<i>Bimastus parvus</i>) native to landfill-leachate-contaminated forest soil

Arizono

Ji³

et al. 2018

J. Toxicol. Sci.

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“…The water soluble and exchangeable fractions of metal(loid) s, which are in equilibrium with the solid-phase speciation, are the most bioavailable form for metal(loid)s to plants (Han, 2007). The metals and metalloids are present in many solid-phase fractions including exchangeable, carbonate bound, organic bound, iron/manganese oxide bound etc (Tessier et al, 1979; Han, 2007; Han and Banin, 1997, 1999; Han et al, 2012). Secretion of H + ions by plant roots improves the mobility and bioavailability of heavy metal(loid)s in soil by competing the binding site of soil particles with metal(loid) cations.…”

Section: Introductionmentioning

confidence: 99%

Electro-kinetic remediation coupled with phytoremediation to remove lead, arsenic and cesium from contaminated paddy soil

Mao

Han

Shao

et al. 2016

Ecotoxicology and Environmental Safety

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103

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The objectives of this study were to investigate distribution and solubility of Pb, Cs and As in soils under electrokinetic field and examine the processes of coupled electrokinetic phytoremediation of polluted soils. The elevated bioavailability and bioaccumulation of Pb, As and Cs in paddy soil under an electrokinetic field (EKF) were studied. The results show that the EKF treatment is effective on lowering soil pH to around 1.5 near the anode which is beneficial for the dissolution of metal(loid)s, thus increasing their overall solubility. The acidification in the anode soil efficiently increased the water soluble (SOL) and exchangeable (EXC) Pb, As and Cs, implying enhanced solubility and elevated overall potential bioavailability in the anode region while lower solubility in the cathode areas. Bioaccumulations of Pb, As and Cs were largely determined by the nature of elements, loading levels and EKF treatment. The native Pb in soil usually is not bioavailable. However, EKF treatment tends to transfer Pb to the SOL and EXC fractions improving the phytoextraction efficiency. Similarly, EKF transferred more EXC As and Cs to the SOL fraction significantly increasing their bioaccumulation in plant roots and shoots. Pb and As were accumulated more in plant roots than in shoots while Cs was accumulated more in shoots due to its similarity of chemical properties to potassium. Indian mustard, spinach and cabbage are good accumulators for Cs. Translocation of Pb, As and Cs from plant roots to shoots were enhanced by EKF. However, this study indicated the overall low phytoextraction efficiency of these plants.

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“…The metals and metalloids are present in many solid-phase fractions including exchangeable, carbonate bound, organic bound, iron/manganese oxide bound etc. (Tessier et al 1979;Han et al 2007;Banin 1997, 1999;Han et al 2006, Han et al 2012. In order to improve the mobility and bioavailability of heavy metal(loid) in soil, electrokinetic field (EKF) was introduced to enhance phytoremediation efficiency of metal(loid) contaminated soils (Cameselle et al 2013).…”

Section: Introductionmentioning

confidence: 99%

The distribution and elevated solubility of lead, arsenic and cesium in contaminated paddy soil enhanced with the electrokinetic field

Mao

Han

Shao

et al. 2016

Int. J. Environ. Sci. Technol.

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The objectives of this study were to investigate fractionation, solubility and potential bioavailability of Pb, As and Cs in Mississippi River Delta paddy soil under an electrokinetic field (EKF). Effects of EKF on soil pH changes and solid-phase distributions of metal(loid)s were examined. Results showed that fractionation of Pb, As and Cs was largely determined by the nature of elements, loading levels and EKF treatment. Native Pb in the soil was mostly in the amorphous iron oxide, organic matter and residual fractions, native As in the amorphous iron oxide, easily reducible oxide and residue fractions while native Cs in the residue fraction. Added Pb, As and Cs showed distinguished solid-phase distributions: Pb dominantly in the organic matter fraction; As in the amorphous iron oxide fraction, and Cs in the residue with a significant watersoluble plus exchangeable fraction. EKF treatment is effective on lowering soil pH to 1.5 near the anode due to water electrolysis releasing proton which is beneficial for dissolution of metal(loid)s, increasing their overall solubility. The acidification in the anode soil efficiently increased the water-soluble Pb and the exchangeable Cs, implying enhanced solubility and elevated their overall potential bioavailability in the anode region while lower solubility in the cathode area. The building up of watersoluble As in the anode region may be from electromigration of As anion from the cathode. This study shows significant enhancement of redistribution, elevated solubility and overall bioavailability of Pb, As and Cs in Mississippi Delta paddy soil under the EKF.

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Mercury distribution and speciation in floodplain soils and uptake into native earthworms (Diplocardia spp.)

Cited by 28 publications

References 25 publications

Comparison of mercury and methylmercury bioaccumulation in earthworms (<i>Bimastus parvus</i>) native to landfill-leachate-contaminated forest soil

Comparison of mercury and methylmercury bioaccumulation in earthworms (<i>Bimastus parvus</i>) native to landfill-leachate-contaminated forest soil

Electro-kinetic remediation coupled with phytoremediation to remove lead, arsenic and cesium from contaminated paddy soil

The distribution and elevated solubility of lead, arsenic and cesium in contaminated paddy soil enhanced with the electrokinetic field

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