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| Effect of organic sulfur on the production of methylmercury in paddy soil |
| Received:November 11, 2020 |
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| KeyWord:organic sulfur;methylmercury;bioavailability;paddy soil;iron |
| Author Name | Affiliation | | CAI Zhangdi | Jinjiang Planting Technology Service Center of Fujian Province, Jinjiang 362200, China |
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| Abstract: |
| In order to examine the role of organic sulfur compounds in the process of inorganic mercury（Hg） methylation, Hgcontaminated paddy soils were collected from the vicinity of a gold mine in Quanzhou, Fujian Province. The effects of three gradients of organic sulfur（0, 500 mg·kg-1, and 1 000 mg·kg-1 reduced glutathione） on the methylation of inorganic Hg in the soil and the bioavailability of methylmercury（MeHg）were investigated based on microcosm experiments. The results showed that compared with the control group, the addition of glutathione significantly increased the dissolution of iron and manganese in soil, and also increased the contents of dissolved carbon. In addition, glutathione application markedly enhanced the production and the dissolution of MeHg in soil. The rates of MeHg increase in the soil solid phase and soil solution were 87.36%~212.48% and 4 380.00%~5 890.30%, respectively. Correlation and stepwise regression model analyses revealed that the content of soluble iron in soil was a key factor affecting the methylation of inorganic Hg and the bioavailability of MeHg. The findings of this study indicate that the roles of iron and manganese oxides in the soil should be taken into consideration when assessing the effects of organic sulfur compounds on the methylation of Hg in soil. |
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