Mobility and distribution of arsenic in contaminated mine soils and its effects on the microbial pool.
Mobility and distribution of arsenic in contaminated mine soils and its effects on the microbial pool.
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DOI：
10.1016/j.ecoenv.2013.06.016
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发表时间：
2013-10
影响因子：
6.8
通讯作者：
R. Marabottini;S. Stazi;R. Papp;S. Grego;M. Moscatelli
中科院分区：
文献类型：
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作者：
R. Marabottini;S. Stazi;R. Papp;S. Grego;M. Moscatelli
用三种不同的分析方法，分析了三种不同污染程度的前矿区土壤中砷(As)的含量及其在不同土壤组分中的分布。还分析了砷对土壤微生物量(大小、呼吸和微生物商)的影响。不同土壤组分之间的总砷浓度差异显著，变化范围为189~4357m g/kg−1，表明污染水平较高。土壤顺序分级显示，超过60%的总砷与Fe-Al氧化物结合，这表明无论样品中砷的总浓度如何，有效性和环境风险都很小。相反，三种样品的水溶性砷组分之间存在显著差异。总砷含量居中的样品中，水溶性砷浓度最大。就微生物生物量而言，研究发现，生物有效性对微生物的基础和累积呼吸作用以及微生物商数产生了负面影响，这表明微生物池中存在着强烈的选择。
Three soils, coming from a former mining site and characterized by a different degree of pollution, were analysed in terms of Arsenic (As) content, using three different analytical approaches, and its distribution in various soil fractions. The effect of As on soil microbial biomass (size, respiration and microbial quotients) was also analysed. Total arsenic concentration between soil fractions was significantly different and ranged from 189 to 4357 mg kg−1, indicating a high level of pollution. Soil sequential fractioning showed that more than 60 percent of total As was bound to Fe–Al oxides,suggesting a minor availability and environmental risk regardless the total concentration of As in the sample. On the contrary, water soluble As fraction showed a significant difference among the three samples. The largest water soluble As concentration was found in the sample with intermediate total As amount. As far as microbial biomass is concerned, it was found that bioavailable As negatively impacted microbial metabolism in terms of basal and cumulative respiration, and microbial quotients, suggesting a strong selection within microbial pool.