蚯蚓对土壤修复前后重金属的形态分级及生物有效性的影响。
The effect of earthworms on the fractionation and bioavailability of heavy metals before and after soil remediation.
作者信息
Udovic Metka, Lestan Domen
机构信息
Agronomy Department, Centre for Soil and Environmental Science, Biotechnical Faculty, University of Ljubljana, Jamnikarjeva 101, 1000 Ljubljana, Slovenia.
出版信息
Environ Pollut. 2007 Jul;148(2):663-8. doi: 10.1016/j.envpol.2006.11.010. Epub 2007 Jan 17.
The effect of two earthworm species, Lumbricus rubellus and Eisenia fetida, on the fractionation/bioavailability of Pb and Zn before and after soil leaching with EDTA was studied. Four leaching steps with total 12.5 mmol kg(-1) EDTA removed 39.8% and 6.1% of Pb and Zn, respectively. EDTA removed Pb from all soil fractions fairly uniformly (assessed using sequential extractions). Zn was mostly present in the chemically inert residual soil fraction, which explains its poor removal. Analysis of earthworm casts and the remainder of the soil indicated that L. rubellus and E. fetida actively regulated soil pH, but did not significantly change Pb and Zn fractionation in non-remediated and remediated soil. However, the bioavailability of Pb (assessed using Ruby's physiologically based extraction test) in E. fetida casts was significantly higher than in the bulk of the soil. In remediated soil the Pb bioavailability in the simulated stomach phase increased by 5.1 times.
研究了赤子爱胜蚓（Eisenia fetida）和红色正蚓（Lumbricus rubellus）这两种蚯蚓对土壤经乙二胺四乙酸（EDTA）淋洗前后铅（Pb）和锌（Zn）的形态分级/生物有效性的影响。用总量为12.5 mmol kg⁻¹的EDTA进行四个淋洗步骤，分别去除了39.8%的Pb和6.1%的Zn。EDTA相当均匀地从所有土壤组分中去除Pb（采用连续提取法评估）。Zn大多存在于化学惰性的残留土壤组分中，这解释了其去除率较低的原因。对蚯蚓粪和剩余土壤的分析表明，赤子爱胜蚓和红色正蚓能积极调节土壤pH值，但在未修复和修复后的土壤中，它们并未显著改变Pb和Zn的形态分级。然而，赤子爱胜蚓粪便中Pb的生物有效性（采用鲁比基于生理学的提取试验评估）显著高于土壤本体。在修复后的土壤中，模拟胃相阶段的Pb生物有效性提高了5.1倍。
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