Effects of humus on the environmental activity of mineral-bound Hg: influence on Hg plant uptake

Yao, Aijun; Qiu, Rongliang; Chang-le, Qing; Mu, Shusen; Reardon, Eric J.

doi:10.1007/s11368-011-0370-3

Cited by 10 publications

(5 citation statements)

References 40 publications

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“…Moreover, litterfall is recognized as a main transfer path of atmospheric Hg to the soil (Juillerat et al, 2012) whereas the thiol groups of soil organic matter are highly efficient in bonding to Hg (Skyllberg et al, 2006). Low Hg T in the E horizons of the mid-slope and upslope soils (b 33 ng g −1 ) is in agreement with its potential loss by leaching due to podzolization (Johansson et al, 1991;Schuster, 1991), being favoured by the presence of dissolved organic matter (Schlüter, 1997;Yao et al, 2011) and the low pH of the soil solution (Yin et al, 1996). Both conditions are present in the E horizons of the CCT soils and could contribute to the Hg impoverishment in these horizons.…”

Section: Discussionmentioning

confidence: 79%

Mercury distribution in a toposequence of sub-Antarctic forest soils of Tierra del Fuego (Argentina) as consequence of the prevailing soil processes

et al. 2014

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Section: Discussionmentioning

confidence: 79%

Mercury distribution in a toposequence of sub-Antarctic forest soils of Tierra del Fuego (Argentina) as consequence of the prevailing soil processes

et al. 2014

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“…The importance of soil organic matter for Hg mobility and bioavailability in soil samples is known and well described [5, 10]. As observed by Yao et al [11], the addition of humus can either suppress or promote Hg bioavailability depending on the soil composition. In this context, the effect of a particular humus fraction on Hg bioavailability is related to its ability to convert Hg bound by solid phases into soluble complexes, as well as the stability of the released complexes.…”

Section: Introductionmentioning

confidence: 99%

Applications of Organic and Inorganic Amendments Induce Changes in the Mobility of Mercury and Macro- and Micronutrients of Soils

García‐Sánchez

Šípková

Száková

et al. 2014

The Scientific World Journal

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Both soil organic matter and sulfur (S) can reduce or even suppress mercury (Hg) mobility and bioavailability in soil. A batch incubation experiment was conducted with a Chernozem and a Luvisol artificially contaminated by 440 mg·kg−1 Hg showing wide differences in their physicochemical properties and available nutrients. The individual treatments were (i) digestate from the anaerobic fermentation of biowaste; (ii) fly ash from wood chip combustion; and (iii) ammonium sulfate, and every treatment was added with the same amount of S. The mobile Hg portion in Chernozem was highly reduced by adding digestate, even after 1 day of incubation, compared to control. Meanwhile, the outcome of these treatments was a decrease of mobile Hg forms as a function of incubation time whereas the contents of magnesium (Mg), potassium (K), iron (Fe), manganese (Mn), copper (Cu), zinc (Zn), and phosphorus (P) were stimulated by the addition of digestate in both soils. The available calcium (Ca) contents were not affected by the digestate addition. The experiment proved digestate application as the efficient measure for fast reduction of mobile Hg at extremely contaminated soils. Moreover, the decrease of the mobile mercury portion was followed by improvement of the nutrient status of the soils.

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“…FA is soluble in both alkaline and acidic solutions, as well as in water, whereas HA is soluble in alkaline solutions but insoluble in water and acidic solutions. Different humic substances have varying effects on Hg; for instance, FA promotes the release and bioaccumulation of Hg in the soil [21,22], while HA has the opposite effect [23][24][25]. Some studies suggest that although HA inhibits soil Hg activity, it enhances Hg methylation through microorganism utilization, resulting in limited Hg reduction in rice.…”

Section: Introductionmentioning

confidence: 99%

The Effects of Different Soil Component Couplings on the Methylation and Bioavailability of Mercury in Soil

Qin,

Ran,

et al. 2023

Toxics

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Soil composition can influence the chemical forms and bioavailability of soil mercury (Hg). However, previous studies have predominantly focused on the influence of individual components on the biogeochemical behavior of soil Hg, while the influence of various component interactions among several individual factors remain unclear. In this study, artificial soil was prepared by precisely regulating its components, and a controlled potted experiment was conducted to investigate the influence of various organic and inorganic constituents, as well as different soil textures resulting from their coupling, on soil Hg methylation and its bioavailability. Our findings show that inorganic components in the soils primarily exhibit adsorption and fixation effects on Hg, thereby reducing the accumulation of total mercury (THg) and methylmercury (MeHg) in plants. It is noteworthy that iron sulfide simultaneously resulted in an increase in soil MeHg concentration (277%). Concentrations of THg and MeHg in soil with peat were lower in rice but greater in spinach. A correlation analysis indicated that the size of soil particles was a crucial factor affecting the accumulation of Hg in plants. Consequently, even though fulvic acid activated soil Hg, it significantly increased the proportion of soil particles smaller than 100.8 μm, thus inhibiting the accumulation of Hg in plants, particularly reducing the concentration of THg (93%) and MeHg (85%) in water spinach. These results demonstrate that the interaction of organic and inorganic components can influence the biogeochemical behavior of soil Hg not only through their chemical properties, but also by altering the soil texture.

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Effects of humus on the environmental activity of mineral-bound Hg: influence on Hg plant uptake

Cited by 10 publications

References 40 publications

Mercury distribution in a toposequence of sub-Antarctic forest soils of Tierra del Fuego (Argentina) as consequence of the prevailing soil processes

Mercury distribution in a toposequence of sub-Antarctic forest soils of Tierra del Fuego (Argentina) as consequence of the prevailing soil processes

Applications of Organic and Inorganic Amendments Induce Changes in the Mobility of Mercury and Macro- and Micronutrients of Soils

The Effects of Different Soil Component Couplings on the Methylation and Bioavailability of Mercury in Soil

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