Study on the Relationship between Selenium and Heavy Metal Contents in Tea and Soil
To study the relationship between selenium(Se)and heavy metal contents in tea leaves and soil,47 tea and soil samples were collected from three counties and two districts of Hezhou City.The contents of Se,lead(Pb),cadmium(Cd),mercury(Hg)and arsenic(As)in tea and soil were statistically analyzed.The correlation between Se content in tea and soil and the corresponding heavy metal contents was analyzed.The results show that the average Se content of tea in the study area was 0.10 mg/kg,which did not meet the standard of Se-rich tea.The average Se content in soil was 0.92 mg/kg,with each sampling site exceeding 0.4 mg/kg,which reached the standard of Se-rich soil.The contents of Pb,Cd,Hg and As in tea and soil samples did not exceed the evaluation limits,and the tea and soil were not polluted by these 4 heavy metal elements.However,the comprehensive pollution index of Cd in soil was 0.75,which reached the alarm level.There were obvious differences in the Cd contents in different soils.The enrichment coefficient of Cd in tea was high,indicating its enrichment ability of Cd was strong.The content of Se in tea shows a highly significant and positive correlation with the content of Se in soil samples.A significant positive correlation between the Cd contents in tea and soil samples,but the correlation between Cd in tea and Se in soil was not significant.The contents of Pb,Hg and As in tea show significant and positive correlations with Se in soil,and the content of Hg in tea shows a significant and positive correlation with the content of Cd in soil.The overall quality of tea and soil in the study area is good,and the study on the correlation between Se and heavy metal contents in tea and soil provided reference value for controlling heavy metal pollution in soil and tea.
万方数据
维普
