徐州市三环南路土壤Cd的形态特征及影响因素研究

[目的]探讨重金属的形态分布特征,揭示重金属污染对土壤环境的影响程度,阐明重金属形态与理化性质之间的相关性。[方法]采用Tissier的同步提取法测定Cd形态含量,利用SPSS对Cd形态和理化性质作Pearson相关分析,并且对Cd形态与其主要影响因子作线性回归模拟。[结果]土壤Cd以残渣态、可交换态和碳酸盐结合态为主,三者含量之和占总量的91.40%;Cd活性态含量较高,占总量的40.09%。[结论]土壤Cd具有一定的生物有效性和潜在危害性,在土地利用时应给予关注;pH是影响土壤Cd形态含量的主要因素;此外,CEC和有机质含量对Cd形态含量也有一定程度的影响。

Study on Characteristics of Heavy Metal Forms of Cadmium in Soil and Its Factors along the Third Ring South Road in Xuzhou City

[Objective] The research aimed to study the distribution characteristics of heavy metal forms,reveal the influence of heavy metal contamination on soil,and clarify the correlation between heavy metal forms and physical and chemical properties.[Method] The Tissier synchronization extraction procedure method was used to analyze the content of the cadmium forms.Correlation analysis of Pearson between forms of cadmium and physical and chemical properties was done with SPSS.And linear regression simulation was done between cadmium forms and its major impact factors.[Result] Cd was mainly in residual fraction,exchangeable and carbonate combined and the content of the three forms accounted for 91.40% of the total.The content of the labile fractions was higher and amounted to 40.09% of the total.[Conclusion] The forms of cadmium had bioavailability and potential risk.In soil environment,more attention should be paid.pH was the dominant factor which affected the content of heavy metal forms of the cadmium.In addition,the forms of cadmium were affected by CEC and organic matters.