南京某污灌区蔬菜中重金属含量及健康风险研究

Concentration Analysis and Health Risk Assessment of Heavy Metals in Vegetables at A Sewage Irrigation Area of Nanjing City

采用火焰原子吸收光谱法测定了南京市某污灌区蔬菜中的重金属含量,并与国内蔬菜标准进行比较;运用目标危害系数(the target hazard quotient,THQ)方法评价了当地居民摄食蔬菜导致的健康风险,并比较了成人和儿童居民THQ值大小。结果表明,蔬菜中Pb含量符合我国无公害绿色蔬菜标准,Cr、Zn和Cu含量超标;成人和儿童均存在因摄食蔬菜导致的Cr和Cu潜在健康风险,成人和儿童重金属复合风险系数分别为11.857和15.569,复合风险主要由Cr引起。各单一重金属对成人和儿童复合风险的贡献率基本相同,儿童因摄食蔬菜导致的重金属健康风险大于成人。

Pb, Cr, Zn and Cu contents in 6 vegetable samples from a sewage irrigation area of Nanjing City were detec- ted by flame atomic absorption spectrometry, and results were compared with main vegetable standards of China. Possible health risks to local residents caused by the heavy metals through consumption of vegetables were assessed based on target hazard quotient （THQ）, and THQ values between adults and children were compared. Results showed that the contents of Pb were in line with Chinese pollution -free green vegetables standard, while Cr, Zn and Cu contents exceeded. Both of adults and children had potential health risks from Cr and Cu. Total metal THQs for adults and children were 11. 857 and 15.569, respectively, which were mainly caused by Cr. Single heavy metal contribution rate to the combined risk was basically the same for adults and children, but health risks for children caused by heavy metals were bigger than adults.