万山矿区土壤汞对蚯蚓的生物有效性研究

doi:10.11934/j.issn.1673-4831.2016.01.020

Abstract

Abstract:

Earthworms(Pheretima guillemi) were used as subject in an exposure experiment in mercury contaminated paddy soil, with inorganic mercury(IHg) ranging from 0.14-76 mg·kg^-1 and methylmercury(MeHg), from 0.65-3.8μg·kg^-1, in a mining area of Wanshan, Guizhou Province. Substantial IHg and MeHg bioaccumulation, i.e., 0.20-10.20 mg·kg^-1 and 7.2-47.8μg·kg^-1,were observed in earthworms after twenty-one days of exposure. Obviously, the bioaccumulation factor(BAFs) for MeHg(5.37-17.55) was 9.9-75 fold higher than that for IHg(0.14-1.14), which indicates that MeHg is much higher in bioavailability than IHg and possess potential biomagnification effect. Analysis of forms of Hg in earthworms reveals that MeHg contributed 0.26%-4.23% of the total mercury in the earthworm, while it did only < 0.1% in the soil. With rising Hg concentration in the soil, MeHg and IHg both increased in the earthworms. MeHg and IHg BAFs were little influenced by soil mercury concentrations, although the proportion of MeHg in earthworm tended to decrease with increasing MeHg concentration in the soil. Furthermore, IHg content in the earthworms displayed an apparent linear relationship with soil mercury concentration, explaining 94% of the variation of IHg in the earthworms. Yet no significant relationship was observed for MeHg. After a comprehensive review of relevant literature and data, it was found that soil inorganic mercury concentration may serve as an indicator for bio-accumulation of IHg in earthworms. Nevertheless, although mercury in the mining-area is thought to be "inert Hg", this study demonstrated that it's still quite highly bioavailable to earthworms, and may pose a potential ecological risk to predators of earthworms in the terrestrial environment.

Key words: Hg-mining area, total mercury, methylmercury, earthworm, bioavailability

CLC Number:

ZHAO Jie, LI Cheng-cheng, YANG Zhou-sheng, DANG Fei, ZHOU Dong-mei. Bioavailability of Mercury to Earthworm(Pheretima guillemi) in Soil of the Wanshan Mining District[J]. Journal of Ecology and Rural Environment, 2016, 32(1): 120-125.

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Bioavailability of Mercury to Earthworm(Pheretima guillemi) in Soil of the Wanshan Mining District

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