万山矿区土壤汞对蚯蚓的生物有效性研究

发布时间：2018-06-17 04:09

本文选题：汞矿区 + 总汞　；参考：《生态与农村环境学报》2016年01期

【摘要】：以威廉环毛蚓(Pheretima guillemi)为试验生物,研究贵州万山矿区水稻土中汞〔w(总汞)为0.14~76 mg·kg-1,w(甲基汞)为0.65~3.8μg·kg-1〕的生物有效性。暴露试验结果表明,矿区土壤中甲基汞的生物富集因子(BAF)为5.37~17.55,高于无机汞的生物富集因子(0.14~1.14),说明甲基汞生物有效性比无机汞更高,具有潜在的生物放大效应。对蚯蚓体内汞形态的分析表明,蚯蚓体内甲基汞占总汞比例为0.26%~4.23%,高于土壤中甲基汞占总汞比例(0.1%)。随着土壤中汞浓度的增加,蚯蚓体内w(无机汞)(0.20~10.20 mg·kg-1)和w(甲基汞)(7.2~47.8μg·kg-1)增加。土壤无机汞浓度与蚯蚓体内无机汞浓度之间呈极显著线性相关(P0.01),但土壤甲基汞浓度与蚯蚓体内甲基汞浓度之间则不存在显著相关关系(P0.05)。综合文献调研结果,发现土壤无机汞浓度能较好地预测蚯蚓体内无机汞的富集。尽管万山矿区汞被认为是"惰性汞",但研究表明这些汞对蚯蚓仍具有较高的有效性,并可能在陆生生态系统中对蚯蚓捕食者产生潜在的生态风险。
[Abstract]:Using Pheretima guillemii as experimental organism, the bioavailability of mercury in paddy soil of Wanshan mining area, Guizhou Province, was studied. The total mercury was 0.1476 mg / kg ~ (-1) (methyl mercury) = 0.65 渭 g / kg ~ (-1). The results of exposure test showed that the bioconcentration factor (BAFs) of methylmercury in mining soil was 5.37 ~ 17.55, which was higher than that of inorganic mercury, which indicated that the bioavailability of methylmercury was higher than that of inorganic mercury, and it had potential biomagnification effect. The analysis of mercury forms in earthworms showed that the proportion of methylmercury to total mercury in earthworms was 0.26% and 4.23%, which was higher than 0.1% of total mercury in soil. With the increase of mercury concentration in soil, the concentrations of w (0.20 ~ (10. 20) mg 路kg ~ (-1) and (7. 2 渭 g 路kg ~ (-1) in earthworms increased. There was a very significant linear correlation between inorganic mercury concentration in soil and inorganic mercury concentration in earthworm, but there was no significant correlation between soil methylmercury concentration and methylmercury concentration in earthworm. It was found that the concentration of inorganic mercury in soil could well predict the accumulation of inorganic mercury in earthworm. Although mercury in Wanshan mining area is considered as "inert mercury", studies show that it is still highly effective to earthworms and may pose a potential ecological risk to earthworm predators in terrestrial ecosystems.
【作者单位】：安徽师范大学环境科学与工程学院;中国科学院土壤环境与污染修复重点实验室;
【基金】：国家自然科学基金(43101559) 江苏省自然科学基金(BK20141041) 污染控制与资源化研究国家重点实验室开放课题(PCRRF13002)
【分类号】：X53;X174

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