Transfer of heavy metals in fruits and vegetables grown in greenhouse cultivation systems and their health risks in Northwest China
Transfer of heavy metals in fruits and vegetables grown in greenhouse cultivation systems and their health risks in Northwest China
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DOI：
10.1016/j.scitotenv.2020.142663
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发表时间：
2021-02-10
影响因子：
9.8
通讯作者：
Hao, Mingde
中科院分区：
文献类型：
--
作者：
Chen, Zhikun;Muhammad, Imran;Hao, Mingde
与传统耕作方式相比，由于温室栽培系统的种植指数高，农业投入大，温室栽培系统中重金属造成的环境问题日益严重。对两个研究区土壤和粮食作物中重金属As、Cd、Cr、Cu、Pb、Zn的浓度进行了分析和评价。陕中地区土壤重金属积累量大于陕北地区土壤。然而，叶类蔬菜中重金属的含量，特别是Cr在叶类蔬菜中的积累量，在NS中高于CS。总的来说，叶菜所含的重金属浓度高于这两个地区的新鲜水果和水果蔬菜。新鲜水果和水果蔬菜的重金属传递因子（TF）为：Cu> Zn > Cd > Cr > as > Pb。然而，在叶类蔬菜中，镉的IF值高于其他金属。除叶菜As外，水果和蔬菜的目标危害商（THQ）值均小于1。THQ值表明，砷污染最严重，其次为Cu b> Zn > Cd > Pb > Cr。基于THQ的土壤阈值（STV）显示，碱性土壤中叶菜As含量为10.85，低于现行标准。本研究揭示了西北平原蔬菜水果重金属含量与健康风险的关系，建议采取必要措施减少西北平原作物重金属的积累。(C) 2020年Elsevier B.V.出版
Due to the high cropping index and substantial agricultural inputs in greenhouse cultivation systems (GCS) compared to traditional farming methods, the environmental problems caused by heavy metals in GCS are becoming increasingly serious. The concentration of the heavy metals As, Cd, Cr, Cu, Pb and Zn in soil and food crops were analyzed and assessed in two study areas. There were greater accumulation of heavy metals in soils from Central Shaanxi (CS) than that from Northern Shaanxi (NS). However, heavy metal concentrations in leafy vegetables were higher in NS compared to CS, particularly Cr accumulation in leafy vegetables. Overall, leafy vegetables contained higher concentrations of heavy metals than fresh fruits and fruit vegetables from both areas. The heavy metal transfer factors (TF) for fresh fruits and fruit vegetables were as follows: Cu> Zn > Cd > Cr > As > Pb. However, in leafy vegetables, Cd had a higher IF value than the other metals tested. The target hazard quotient (THQ) values were less than 1 for fruits and vegetables, except for As in leafy vegetables from NS. The THQ values indicated that As contamination was the most serious concern, followed by Cu > Zn > Cd > Pb > Cr in both areas. The soil threshold value (STV) based on THQ showed that the level of As in leafy vegetables grown in alkaline soil was 10.85, which was inferior to the current standards. This study demonstrates the health risks associated with the heavy metal content of fruits and vegetables grown in GCS and suggests that necessary measures should be taken to reduce the accumulation of heavy metals in GCS crops in northwest China. (C) 2020 Published by Elsevier B.V.