标题：The National Distribution Pattern and Factors Affecting Heavy Metals in Sediments of Water Systems in China
作者：Cao, Qingqing; Wang, Hui; Li, Yanran; Zhang, Yiran; Zheng, Peiming; Wang, Renqing; Lal, Rattan; Ge, Xiuli; Liu, Jian
作者机构：[Cao, Qingqing; Wang, Hui; Li, Yanran; Wang, Renqing; Liu, Jian] Shandong Univ, Inst Environm Res, Jinan 250100, Shandong, Peoples R China.; [Cao, Q 更多
通讯作者地址：[Liu, J]Shandong Univ, Inst Environm Res, Jinan 250100, Shandong, Peoples R China.
来源：SOIL & SEDIMENT CONTAMINATION
关键词：Coast Sea; constructed wetlands; heavy metals; river basin
摘要：Heavy metal discharge has become one of the most serious environmental problems due to extensive industrialization. Sixty eight sediment samples from four wetlands were collected to analyze the regional factors affecting metal deposition. Meanwhile, a national sediment data collection based on relevant publications was developed covering the period from 2000 to 2016 to study the metal distribution in China. Principal metals assessed in this study are Cr, Cd, Cu, Pb, Zn, As, and Ni. At regional scale, the accumulation of Pb and Cd is significantly higher in surface than in subsurface sediments. At the national scale, heavy metals tend to increase with the increase in precipitation from 600 to 1500mm. Further, metal deposition in the main river basins in China shows an increase trend from northern to southern China, and follows the order of: Pearl River > Yangste River > Yellow River > Hai River and Liao River. Cluster analyses show that these river basins contribute a large proportion of heavy metals to coastal metal deposition, which follows the order of: South Sea > East Sea > Bohai Sea > Yellow Sea. In general, metal deposition in sediments of water systems increases from northern to southern China irrespective of in-land area or coastal seas.