National Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China.
Environ Sci Pollut Res Int. 2014 Jan;21(2):1054-63. doi: 10.1007/s11356-013-1969-2. Epub 2013 Jul 20.
Overlying water, pore water, and sediment samples were collected from the Dahuofang reservoir in November 2011 and April 2012, respectively. Total arsenic and arsenic species including arsenite, arsenate, monomethylarsonic, and dimethylarsinic were analyzed by ICP-MS and HPLC-ICP-MS. The results indicated that the environments of the Dahuofang reservoir were in reduced conditions, arsenite was the predominant species in pore water and sediments in the reservoir. Arsenic concentrations in overlying water were very low in all the samples but showed different trend during the different time. In November, arsenic concentrations in the reservoir inlet were higher than that in the other sites, whereas arsenic showed accumulation from the upstream to downstream of the reservoir in samples collected in April. In pore water, arsenic concentrations were about 23 and 37 times higher than those in overlying water in November and April, respectively, and relatively high levels of arsenite were also detected in the pore water. In surface sediments, total arsenic and arsenic species content in the reservoir inlet showed the following decreasing order: R1 > R10 > R4. The results also showed that moderate ecological risks exist in pore water and sediments in the Dahuofang reservoir.
于 2011 年 11 月和 2012 年 4 月分别采集了大水河水库的表层水、孔隙水和沉积物样品。采用 ICP-MS 和 HPLC-ICP-MS 分析了总砷和砷形态，包括亚砷酸盐、砷酸盐、一甲基砷酸和二甲基砷酸。结果表明，大水河水库环境处于还原状态，亚砷酸盐是水库孔隙水和沉积物中的主要形态。所有样品中的表层水中砷浓度都非常低，但在不同时间呈现不同的趋势。11 月，水库进水口的砷浓度高于其他地点，而 4 月采集的样品则显示砷从水库上游到下游的积累。在孔隙水中，砷浓度分别比 11 月和 4 月的表层水高约 23 倍和 37 倍，并且在孔隙水中还检测到相对较高水平的亚砷酸盐。在表层沉积物中，水库进水口处的总砷和砷形态含量按以下顺序递减：R1＞R10＞R4。结果还表明，大水河水库的孔隙水和沉积物中存在中等生态风险。
