Li Xuan-Tian, Zhang Feng-Bao, Yang Ming-Yi
State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A&F University, Yangling 712100, Shaanxi, China.
Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yang-ling 712100, Shaanxi, China.
Ying Yong Sheng Tai Xue Bao. 2020 Dec;31(12):4225-4234. doi: 10.13287/j.1001-9332.202012.035.
In order to understand the spatial variation of heavy metals in Shaanxi section of Weihe River, the contents and sources of Cd, Co, Cu, Pb, Sb, As, Ni, Cr, Zn, Mn in sediments at 17 sampling sites in Shaanxi section of Weihe River and its tributaries were analyzed. The results showed that the average contents of Cd, Co, Cu, Pb, Sb, As, Ni, Cr, Zn, Mn were 0.10, 1.24, 11.73, 11.95, 24.90, 24.91, 29.31, 54.18, 72.74, 626.85 mg·kg, respectively. Except for that of Cd being greater than 1, the coefficient of variation for each of other heavy metals was less than 0.5. The peak contents of Cd, Pb and Cr were found at the sampling site of Bahe River, of Co and Mn at Heihe River, of Cu and Zn at Qingjiang River, and of Sb, As and Ni at Shawang Ferry, Xianyang Railway Bridge and Linjia Village, respectively. According to the results of correlation analysis, principal component analysis and cluster analysis, the elements of Cd, Co, Cu, Pb, Ni, Cr, Zn and Mn mainly originated from industrial and domestic sources, but Sb and As mainly originated from agricultural and geochemical sources.
为了解渭河陕西段重金属的空间变化特征，对渭河陕西段及其支流17个采样点沉积物中镉（Cd）、钴（Co）、铜（Cu）、铅（Pb）、锑（Sb）、砷（As）、镍（Ni）、铬（Cr）、锌（Zn）、锰（Mn）的含量及来源进行了分析。结果表明，Cd、Co、Cu、Pb、Sb、As、Ni、Cr、Zn、Mn的平均含量分别为0.10、1.24、11.73、11.95、24.90、24.91、29.31、54.18、72.74、626.85 mg·kg。除Cd的变异系数大于1外，其他重金属的变异系数均小于0.5。Cd、Pb和Cr的峰值含量分别出现在灞河采样点，Co和Mn的峰值含量出现在黑河采样点，Cu和Zn的峰值含量出现在清姜河采样点，Sb、As和Ni的峰值含量分别出现在咸阳铁路桥沙王渡和林家寨采样点。根据相关性分析、主成分分析和聚类分析结果，Cd、Co、Cu、Pb、Ni、Cr、Zn和Mn元素主要来源于工业和生活源，而Sb和As主要来源于农业和地球化学源。
