摘要 为探究南京市郊某污灌区环境治理效果、小白菜中重金属健康风险及其根际土壤重金属超标情况,采用靶标危害系数及体外模拟法对研究区小白菜重金属健康风险进行评估,利用农用地土壤污染风险管控标准(试行)(GB 15618—2018)对比小白菜根际土壤重金属超标情况。结果显示,Cd在小白菜根际土壤中最小值达到0.95mg/kg,最大值达到了1.14mg/kg,平均1.05mg/kg,超过农用地土壤污染风险管控标准。对于成人和儿童,其THQ的最大值从大到小排序为Cu>Pb>Cr>Cd>Zn,小白菜对成人及儿童的HI值分别为6.75×10-3和5.76×10-3,两者均小于1,表明使用该模型评估得出小白菜中重金属对暴露人体造成的健康影响不明显。成人通过食用研究区小白菜日均摄入Pb、Zn、Cu和Cd的含量范围依次为337~430、3 294~3 025、359~540及288~483mg。儿童通过食用研究区小白菜日均摄入Pb、Zn、Cu和Cd的含量范围分别为221~282、1 985~2 162、235~354及189~317mg。综上所述,重金属生物可给量均未超过每周可耐受摄入量值,证明食用污灌区小白菜不存在重金属健康风险。与前次研究相比(采样时间相隔七年),相关部门对该区域环境治理取得了很好的效果,但还应注意Cd在土壤及小白菜中的迁移及富集。 In order to explore effect of environmental remediation,health risk of heavy metals in Chinese cabbage and situation of heavy metals exceeding the standard values in rhizosphere soil of a sewage irrigation area in Nanjing suburb,health risk of heavy metals in Chinese cabbage was evaluated by target hazard quotients(THQ)and in-vitro simulation method through comparing concentration of heavy metal in rhizosphere soil of Chinese cabbage with the standard for soil pollution risk control of agricultural land(GB 15618—2018).The results show that the minimum,maximum and average values of Cd is 0.95,1.14 and 1.05 mg/kg,respectively,which all exceed the standard of soil pollution risk control for agricultural land.For adults and children,the order of THQvalues is Cu>Pb>Cr>Cd>Zn.The health index(HI)values of Chinese cabbage to adults and children are 6.75×10-3 and 5.76×10-3,respectively,both of them are less than 1,which indicates that heavy metals in Chinese cabbage had no significant impact on human health.The average daily intake of Pb,Zn,Cu and Cd in Chinese cabbage of adults is 337—430,3 294—3 025,359—540 and 288-483 mg,respectively.The average daily intake of Pb,Zn,Cu and Cd in Chinese cabbage of children is 221—282,1 985—2 162,235—354 and 189—317 mg,respectively.In summary,bioavailability of heavy metals do not exceed the weekly tolerable intake value,which indicates that there is no health risk for Chinese cabbage in edible sewage irrigation area.Compared with the previous study(sampling interval is 7 years),the relevant departments achieve significantly effects in regional environmental remediation,however,attention should still be paid to migration and accumulation of Cd in soil and Chinese cabbage.
机构地区 江苏开放大学环境生态学院
出处 《有色金属:冶炼部分》 CAS 北大核心 2021年第3期71-77,共7页 Nonferrous metals(Extractive metallurgy)
基金 江苏省环境工程重点实验室科研开放基金课题(KF2015007) 江苏省高等学校自然科学研究面上项目(17KJB610002)。
关键词 污灌区 小白菜 重金属 靶标危害系数(THQ) 体外模拟法 sewage irrigation area Chinese cabbage heavy metals target hazard quotients(THQ) in-vitro simulation method
