Shaanxi Provincial Land Engineering Construction Group Co., Ltd., Shaanxi Key Laboratory of Land Consolidation, Xi'an City, 710075, Shaanxi Province, China.
PowerChina Northwest Engineering Corporation Limited, Xi'an City, 710075, Shaanxi Province, China.
Environ Monit Assess. 2018 Jun 5;190(7):380. doi: 10.1007/s10661-018-6740-1.
The parameters of water contents, oxidation-reduction potential, organic matter, total phosphorus, total nitrogen and heavy metals concentrations of mercury (Hg), cadmium (Cd), lead (Pb), arsenic (As), chromium (Cr), copper (Cu) and zinc (Zn) in surface sediment and their vertical distribution incore sediments of the Heer river were investigated. Evaluation of nutrients and heavy metals in the Heer River sediments was done by pollution index and potential ecological risk index (PERI) method, respectively. Environmental dredging depth was calculated. The parameters pH, water content, total nitrogen (TN), and organic matter (OM) as well as heavy metals decline with the increased depth. Nutrients of TN, total phosphorus (TP), OM, and heavy metals Cd, Cu, and Pb were classified into the same group and there were significant positive correlations according to the principal component analysis and Pearson correlation, implying that they have a common origin. The results of high pollution index value of OM, TP, and TN of surface sediment obtained from this research showed that the Heer River was in serious nutrient pollution. The contributions of individual metals to the potential ecological risk were in the following order: Cd > Cu > Ni > Cr > Zn > As > Pb. Cd presented serious ecological risk and contributed most to the sediments of the Heer River. The ecological risk (RI) was at a considerable high risk level, and therefore, the environmental dredging depth of the Heer River is 94 cm for the purpose of reducing heavy metal contamination of the Heer River.
对黑尔河表层沉积物中的含水量、氧化还原电位、有机物、总磷、总氮和汞（Hg）、镉（Cd）、铅（Pb）、砷（As）、铬（Cr）、铜（Cu）和锌（Zn）等重金属浓度及其在河芯沉积物中的垂直分布进行了研究。分别采用污染指数法和潜在生态风险指数法（PERI）对黑尔河沉积物中的营养物质和重金属进行了评价。计算了环境疏浚深度。随着深度的增加，参数 pH 值、含水量、总氮（TN）和有机物（OM）以及重金属均呈下降趋势。根据主成分分析和 Pearson 相关性，TN、总磷（TP）、OM、重金属 Cd、Cu 和 Pb 等营养物质被归为同一组，存在显著的正相关关系，表明它们具有共同的来源。本研究得出的表层沉积物中 OM、TP 和 TN 的高污染指数值表明，黑尔河存在严重的营养物污染。个别金属对潜在生态风险的贡献顺序为：Cd＞Cu＞Ni＞Cr＞Zn＞As＞Pb。Cd 呈现出严重的生态风险，对黑尔河沉积物的贡献最大。生态风险（RI）处于相当高的风险水平，因此，为了降低黑尔河的重金属污染，黑尔河的环境疏浚深度为 94cm。
