Reduction characteristics and main influencing factors of Cr(Ⅵ)in soils of sea-land interaction zone
Research on the differences in Cr(Ⅵ)reduction characteristics and the main controlling factors between sea-land interaction zone and inland soils is of great significance in revealing the behavioral patterns of Cr(Ⅵ)pollution and developing effective prevention and control strategies.This study took soils from sea-land interaction zones of Yantai and Shenzhen and soils from the inland city Changsha as target soil samples,investigated the reduction behaviors of Cr(Ⅵ)by simulated experiments,and identified the main controlling factors with stepwise regression and grey correlation analysis.The results showed that temperature was the key factor affecting Cr(Ⅵ)reduction in the 30-day experiment,and the reduction rate of Cr(Ⅵ)was favored at 25℃ compared with the low temperature of 4℃;microorganisms had a relatively small effect on Cr(Ⅵ)reduction,while Fe(Ⅱ)and Mn(Ⅱ)in the soil,as the reducing substances,had a certain correlation.Furthermore,the results of stepwise regression and grey correlation analysis indicated that organic matter content was an important factor affecting Cr(Ⅵ)reduction,and pH as well as different forms of Mn and Fe also affected Cr(Ⅵ)reduction.
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