Enrichment characteristics of farm-grown vegetables in the Nanning section of the Yongjiang River and assessment of dietary exposure of the population
Objective Analysis of farm-grown vegetables and soil multi-element accumulation in the Nanning section of Yongjiang River,and exploration of vegetable heavy metal enrichment characteristics and dietary exposure risks.Methods From January to March 2023,315 vegetable samples and 75 soil samples were collected from three districts around the Yongjiang river basin in Nanning,and the contents of sample species Cd,Pb,Cu and Zn were determined by Inductively coupled plasma mass spectrometer(ICP MS)and atomic spectrophotometer respectively,and the results were analyzed by the Nemero integrated pollution index method for contamination and dietary exposure risk assessment.Results According to GB 2762-2017 the Cd exceedance rate of vegetable sample varieties was 14.8％;the Cd content of all soil samples exceeded the background value of Nanning soil,with the highest exceeding the background value by 7.50 times;the Cd enrichment capacity in vegetables was the strongest,and the migration capacity of Pb in the soil-vegetable system was weak;the accumulation of edible parts of sweet potato leaves and mustard during cultivation The ability to accumulate heavy metals in the edible parts of sweet potato leaves and mustard during cultivation was low.The dietary exposure risk assessment showed that the consumption of vegetables grown in the study area by the population according to their daily dietary habits had a low potential to pose a non-carcinogenic risk to humans.Conclusion At present,the dietary exposure risk of heavy metal elements for vegetables grown by farmers around the Yongjiang River Basin in Nanning is at a safe level,but the accumulation of heavy metals in the soil needs to be taken seriously,and the continuous accumulation of heavy metals in the soil will increase the dietary exposure risk of heavy metals for vegetables
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