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2016, Volume 10, Issue 1

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Frontiers of Environmental Science & Engineering >> 2016, Volume 10, Issue 1 doi: 10.1007/s11783-014-0723-4

Sequence of the main geochemical controls on the Cu and Zn fractions in the Yangtze River estuarine sediments

1. Key Laboratory for Water and Sediment Science of Ministry of Education, School of Environment, Beijing Normal University, Beijing 100875, China.2. Interdisciplinary Life Science Graduate Program, Purdue University, West Lafayette, IN 47907, USA

Accepted: 2014-06-11 Available online: 2015-12-03
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Abstract

Metal speciation can provide sufficient information for environmental and geochemical researches. In this study, based on the speciation determination of Cu and Zn in the Yangtze Estuary sediments, roles of eight geochemical controls (i.e., total organic carbon (TOC), clay, Fe/Mn in five chemical fractions and salinity) are fully investigated and sequenced with correlation analysis (CA) and principal components analysis (PCA). Results show that TOC, clay and Fe/Mn oxides are key geochemical factors affecting the chemical speciation distributions of Cu and Zn in sediments, while the role of salinity appears to be more indirect effect. The influencing sequence generally follows the order: TOC>clay>Mn oxides>Fe oxides>salinity. Among the different fractions of Fe/Mn oxides, residual and total Fe content, and exchangeable and carbonate Mn exert the greatest influences, while exchangeable Fe and residual Mn show the poorest influences.

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