Risk Assessment and Source Analysis of Heavy Metal Pollution in Typical Vegetable Base Soil
To investigate the pollution characteristics of heavy metals in typical greenhouse soil and assess their ecological risks,this paper selects the surface soil of vegetable bases in Huizhou District,Huangshan City as its research subject.Multiple pollution evaluation methods are used for risk assessment of heavy metals in the soil,and correlation analysis and principal component analysis are utilized to analyze the sources of heavy metals in the soil.The results show that the pH of the vegetable base soil is generally acidic.The average concentrations of heavy metals in the soil,from highest to lowest,are Cr＞Zn＞Cu＞Pb＞Ni＞As＞Cd.Except for Cd,which exceeds the national standard,the concentrations of other heavy metals are within acceptable limits.However,all of them exceed the soil environmental background values in Anhui Province.Specifically,the exceedance percentages for Cd and As are 422.68％and 264.33％,respectively.The average values of the soil heavy metal pollution index are all greater than 1,with the potential pollution index values for Cd and As exceeding 3,indicating severe pollution levels.The assessment of the geoaccumulation index reveals that,except for Cd at a moderate pollution level,the other heavy metals are at mild pollution levels or below.The potential ecological risk level for the heavy metal Cd is rated as strong and above,while for the others,it is mild.The sources of heavy metals are diverse,primarily related to human production activities and parent materials.Cd and As contamination mainly originate from anthropogenic sources.In summary,the overall ecological risk of the vegetable base soil is relatively high,with a tendency for heavy metal accumulation.Precautions should be taken to mitigate their potential hazards.
万方数据
维普
