Lead bioaccumulation in earthworms, Lumbricus terrestris, from exposure to lead compounds of differing solubility
Lead bioaccumulation in earthworms, Lumbricus terrestris, from exposure to lead compounds of differing solubility
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DOI：
10.1016/j.scitotenv.2004.11.011
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发表时间：
2005-06-15
影响因子：
9.8
通讯作者：
Thomas, VG
中科院分区：
文献类型：
--
作者：
Darling, CTR;Thomas, VG
本研究探讨了可溶性和难溶性铅化合物对蚯蚓富集铅的相对影响。蚯蚓被暴露于被一系列浓度的可溶性三水醋酸铅（PbAc）（14.5、72.2、137、257和603 μ g/g）或可溶性更低的碳酸铅（Pb（CO 3）（2））（5.09、171、575和710 μ g/g）污染的堆肥牛粪中。比较了PbAc和Pb（CO 3）（2）碳酸铅试验中蚯蚓对Pb的相对生物累积速率随时间的变化（0、20、40和60天）。这两种分子形态的铅都被有机质强烈吸附。粪肥孔隙水中可溶性铅的相对浓度很低，PbAc和Pb（CO 3）（2）分别为总铅的0.049%和0.022%。蚯蚓对易溶态和难溶态的铅均有显著的吸收。回归表面有机质总铅浓度暴露时间和铅的身体负担进行了比较。对于PbAc试验，拟合以下方程：身体负荷=2.3429+0.0014x-0.0632y+0.0008xy（R-2=0.8494，p < 0.0001）。对于Pb（CO_3）_2试验，其方程为：体负荷=-2.0760-0.0067x-0.2297y-0.0038y（2）+0.0003xy（R-2=0.5686，p < 0.0001）（x=有机质Pb浓度，单位为μ g/g，y=时间，单位为天）。PbAc暴露导致的Pb生物累积显著高于Pb（CO 3）（2）。蚯蚓体内铅负荷与暴露时间和总铅浓度呈线性相关。暴露于Pb（CO 3）（2）的蠕虫具有随时间的非线性铅积累，这表明随着暴露时间的增加，铅的生物有效性降低。结果表明，L.在射击场和铅冶炼场，以上层土壤中的碎屑为食的陆生动物可以从金属铅的主要转化产物中动员和积累铅。(c)2004 Elsevier B. V.保留所有权利。
This study examined the relative effects of soluble and less soluble Pb compounds on Pb accumulation by Lumbricus terrestris. The earthworms were exposed to composted cattle manure contaminated with a range of concentrations of either soluble lead acetate trihydrate (PbAc) (14.5, 72.2, 137, 257, and 603 mu g/g) or less soluble lead carbonate (Pb(CO3)(2)) (5.09, 171, 575, and 710 mu g/g). Relative Pb bioaccumulation rates in earthworms from the PbAc and Pb(CO3)(2) lead carbonate trials were compared over time (0, 20, 40, and 60 days). The two molecular forms of Pb were heavily adsorbed onto the organic matter. Relative soluble Pb concentrations in the manure pore water were very low, at 0.049% and 0.022% of total Pb for PbAc and Pb(CO3)(2), respectively. There was a significant uptake of lead by earthworms from both the readily soluble and less soluble forms of Pb. Regression surfaces relating organic matter total Pb concentration to exposure time and Pb body burden were compared. For the PbAc trial, the following equation was fitted: Body burden=2.3429+0.0014x-0.0632y+0.0008xy (R-2=0.8494, p < 0.0001). For the Pb(CO3)2 trial, the equation was: Body burden=-2.0760-0.0067x-0.2297y-0.0038y(2)+0.0003xy (R-2=0.5686, p < 0.0001) (for x=organic matter Pb concentration in mu g/g and y=time in days). The Pb bioaccumulation resulting from the PbAc exposure was significantly higher than that from Pb(CO3)(2). Body burdens of earthworms exposed to PbAc were linearly related to exposure time and total Pb concentration. Worms exposed to Pb(CO3)(2) had non-linear Pb accumulation over time that suggested a decrease in Pb bioavailability with increasing exposure time. The results indicate that L. terrestris feeding on detritus in the upper soil levels can mobilize and accumulate Pb from the principal transformation products of metallic Pb, as at shooting ranges and lead smelter sites. (c) 2004 Elsevier B.V. All rights reserved.