Major Ion and Dissolved Heavy Metal Geochemistry, Distribution, and Relationship in the Overlying Water of Dongting Lake, China

Overview

Journal Environ Geochem Health

Specialties Chemistry
Environmental Health

Date 2018 Oct 5

PMID 30284697

Citations 4

Authors

Yan Chen

Lingqing Wang

Tao Liang

Jun Xiao

Jing Li

Haicheng Wei

Linlin Dong

Affiliations

Soon will be listed here.

Abstract

Deteriorating lake water quality has become a serious environmental issue around the globe. Heavy metals dissolved in the overlying water of lakes are notably more toxic than those found in lake sediment. Given this, we sought to better understand the characteristics of particular major ion and dissolved heavy metal in Dongting Lake-the second largest freshwater lake in China. Overlying water samples were collected from Dongting Lake to investigate the major ion geochemistry and to examine the relationship between the major ions and dissolved heavy metals. Chemical analysis of the overlying water showed that the average cation concentration was the highest for Ca, followed by Mg, Na, and K. Similarly, the highest anion concentration was SO, followed by Cl, NO, and HCO. Total dissolved solids in the overlying water of Dongting Lake ranged from 66.19 to 159.20 mg/L, with an average value of 93.13 mg/L. The predominant hydrochemical type was Ca-SO. The mean concentrations of dissolved heavy metal in both surface and deep waters decreased in the following order: Zn > Cr > Ni > Cu > Pb > Cd. Importantly, all of the selected heavy metals tested in the overlying water were lower than the corresponding toxicity reference values. Co-occurrence network analyses were performed and compared the correlations between all measured major ions and heavy metals. Results of the subsequent principal component analyses revealed that heavy metal levels in the aquatic environment primarily originated from natural processes and were enhanced by anthropogenic activities.

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