2015年调水调沙期间黄河悬浮颗粒Pb及其稳定同位素组成变化

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Abstract

Field observations and sediment samples collection were conducted at Lijin Hydrological Station during the Water-Sediment Regulation Scheme (WSRS) period from June 29 to July 20 in 2015 and Xiaolangdi Reservoir. The temporal variations, sources and influence by WSRS of the particulate trace metal lead (Pb) concentrations and its stable isotopic composition in the Yellow River were studied. The results showed that the contents of Pb in the suspended sediments from the Yellow River were ranged from 18.09 to 28.35μg/g, with average of 21.64μg/g, while the value of the stable isotope ²⁰⁷Pb/²⁰⁶Pb and ²⁰⁸Pb/²⁰⁶Pb were ranged 0.8367~0.8481, 2.0839~2.0997, respectively. Both the concentrations of Pb and its stable isotope composition were higher in the early and final stages of WSRS, but lower in the middle of this period. Pb in the studied sediments was mainly natural sources, but the content of Pb in sediments of Xiaolangdi Reservoir were significantly higher, which affected by the pollution of human activities in the middle and upper reaches of the Yellow River basin. The process of WSRS has a significant impact on the variations and source of Pb from the Yellow River into the sea. In the early and final stages of WSRS, with the lower water and sediment flux, the flooding effect on the downstream riverbed was weak, so the Pb content and isotopic composition were higher, which were mainly come from the middle and upper reaches and affected by human activities. In the main period of WSRS, the suspended sediment from Yellow River to the sea was dominated by the source of the flooding to downstream riverbed, so Pb in sediments was dominated by natural sources and was not affected by human activities.

Key words： lead isotope source Yellow River water-sediment regulation scheme

Received: 29 November 2018

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X522

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	Articles by authors
	LIU Ming
	YANG Ya-di
	BI Nai-shuang
	CHEN Jing-bo
	FAN De-jiang

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LIU Ming,YANG Ya-di,BI Nai-shuang等. Variations of Pb and its stable isotopic composition of suspended particles in the Yellow River during water-sediment regulation scheme period in 2015[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(7): 3009-3017.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I7/3009

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