黔产薏苡仁及其产地土壤重金属污染的特征

[目的]探明黔产薏苡仁及其产地土壤重金属污染特征,为黔产薏苡仁产业可持续发展及其产地土壤重金属防控提供科学依据.[方法]以黔西南薏苡仁及其产地土壤为供试样品,分析测定土壤pH值、有机质、阳离子交换量(CEC)和5种重金属元素镉(Cd)、铅(Pb)、锌(Zn)、铜(Cu)、镍(Ni)的含量,运用GIS和单因子污染风险评价...

Characteristics of Heavy Metal Pollution of Coix Seed and Soil from Its Producing Area in Guizhou Province

[Objective]The heavy metal pollution of Coix seed and soil in its producing area were studied to provide a scientific basis for the sustainable development of the Guizhou Coix seed industry and the prevention and control of heavy metals in the soil of its origin.[Methods]The Coix seed and the soil of its producing area were used as the test samples.The soil pH value,organic matter,cation exchange capacity,and five heavy metal elements,such as cadmium(Cd),lead(Pb),zinc(Zn),copper(Cu),and nickel(Ni)were determined using geographic information system and single-factor pollution risk assessment methods to explore the spatial distribution of soil heavy metals and the impact of soil heavy metal pollution on the quality and safety of Coix seeds.[Results]①The Cd,Pb,Zn,Cu,and Ni contents in the soil ranged from 0.01 to 1.35,10.09 to 34.70,80.39 to 236.36,22.54 to 131.42,and 26.75 to 137.76 mg/kg,respectively,of which the maximum values of Cd,Cu,and Ni were higher than the current national standard(GB15618-2018),indicating that there was a certain range of Cd,Cu,and Ni pollution risk in the soil in the study area.The comprehensive pollution index was 1.94,and the pollution level was light pollution.②The contents of Cd,Pb,Zn,Cu,and Ni in the Coix seed ranged from not detected to 0.027,0.179 to 1.348,42.615 to 58.961,10.028 to 16.244,and 0.552 to 5.045 mg/kg,respectively.Cd did not exceed the standard,while Pb,Zn,Cu,and Ni exceeded the standard by varying degrees,with the exceeding rates being 90%,25%,75%,and 30%,respectively.Coix seed had a strong cumulative effect of Pb.[Conclusion]By simultaneously collecting soil samples and corresponding Coix seed samples,the analysis results can be used to evaluate the impact of soil heavy metal pollution on the quality and safety of Coix seed.