Distribution of cadmium among multimedia in Lake Qinghai, China
Distribution of cadmium among multimedia in Lake Qinghai, China
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中国青海湖多媒体中镉的分布
DOI：
10.1007/s12665-018-7332-7
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发表时间：
2018-02-01
影响因子：
2.8
通讯作者：
Liu, Xitao
中科院分区：
文献类型：
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作者：
Lin, Chunye;Xue, Yumeng;Liu, Xitao
位于青藏高原的青海湖是中国最大的湖泊。本研究首次报道了该湖泊中Cd的地球化学特征。采集了青海湖（n= 69）和布哈河（n= 12）的水样，并分别采集了青海湖及其周边地区的沉积物（n= 22）和表土（n= 45）样品。此外，孔隙水样品（n= 20）从沉积物样品中分离。分析了水样的pH值，K，Na，Ca，Mg，Cl，S和Cd，同时分析了沉积物和表土样品的K，Na，Ca，Mg，Al，Fe，Mn，S，Sc和Cd。青海湖水体中Cd的平均浓度为0.014 μg L− 1，布哈河水中Cd的平均浓度为0.007 μg L− 1。而沉积物孔隙水中Cd的平均浓度为0.320 μg L− 1，远高于湖水和河水。湖水中镉的浓度可能主要受盐度控制，而孔隙水中镉的浓度可能主要受碳酸盐矿物控制。河水中镉的浓度可能受碱度和pH值的控制。沉积物中镉的平均浓度为0.284 mg kg−1。Cd在湖泊沉积物中的富集程度明显高于湖周表层土壤。人为大气沉降并未导致湖水中溶解态Cd含量的增加，但导致其在湖泊沉积物中富集。
Lake Qinghai in the Qinghai-Tibet plateau is the largest lake in China. This study firstly reported the geochemistry of Cd in the lake. Water samples were collected from Lake Qinghai (n= 69) and Buha River (n= 12), while sediment (n= 22) and topsoil (n= 45) samples were collected from the lake and around the lake area, respectively. In addition, pore water samples (n= 20) were separated from sediment samples. Water samples were analyzed for pH, K, Na, Ca, Mg, Cl, S, and Cd, while sediment and topsoil samples were analyzed for K, Na, Ca, Mg, Al, Fe, Mn, S, Sc, and Cd. The average concentration of Cd was 0.014 μg L−1in the water of Lake Qinghai and 0.007 μg L−1in the water of Buha River. However, the average concentration of Cd was 0.320 μg L−1in the sediment pore water, much higher than that in the lake water and river water. Cadmium concentration in the lake water might be mainly controlled by salinity, while it in the pore water might be mainly controlled by carbonate minerals. Cadmium concentration in the river water might be controlled by alkalinity and pH. The average concentration of Cd in the sediment was 0.284 mg kg−1. The enrichment of Cd in the lake sediment was significantly higher than that in the topsoil around the lake. Anthropogenic atmospheric deposition of Cd did not led to the increase in dissolved Cd level in the lake water, but led to its enrichment in the lake sediment.