Form simulation and influencing factors of cadmium ions in the Longjiang river, China

Form simulation and influencing factors of cadmium ions in the Longjiang river, China

Yongxiang Zhang 

Guangxi University of Finance and Economics, Nanning 530003, China

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Based on the cadmium pollution incident of the Longjiang River, this paper simulates the ionic form of heavy metal cadmium in the river on Visual MINTEQ using the perennial monitoring data on water quality, explores the impacts of concentration, water temperature and pH on the form of cadmium ions in the water body, and discusses the relationship between cadmium ions and the main ions (i.e. Ca2+ and HCO3-) in the river. The research shows that: free Cd2+ is the dominant pollutant of the cadmium pollution in the Longjiang River; the form of Cd2+ is mainly influenced by the pH of the water body; the optimal pH range is 7~9.5 for the treatment of cadmium pollution by chemical precipitation; when the pH is above 8, all ion contents in the water body plunge deeply. The research findings shed new light on the migration law and toxicological features of heavy metals, and provide a reference for the toxicological study of heavy metal pollution in water bodies


form simulation, influencing factors, cadmium, Longjiang river

1. Introduction
2. Research area and hydrochemical indices
3. Data analysis
4. Form simulation of cadmium in the Longjiang river
5. Analysis of relationship between Cd2+ and main ions in the water body
6. Conclusions

This study is supported by the National Natural Science Foundation of China (Grant No. 51409050), the Natural Science Foundation of Guangxi Province (Grant No. 2015GXNSFBA139241) and the Basic ability improvement project of young teachers in Guangxi (No. KY2016YB662)


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