【摘要】 在甘肃省榆中县蔬菜基地,选择30个点位采集4种蔬菜(120株)及相应的土样,在分别对重金属Hg、Cd、Pb、Cr、Cu含量分析测试的基础上,开展蔬菜重金属污染评价、富集能力分析及健康风险评估。结果表明:研究区土壤中Hg、Cd、Pb、Cr、Cu平均含量分别为0.159、0.364、15.001、37.633、31.298 mg·kg-1,土壤中Pb、Cr含量均低于兰州市土壤背景值,但Hg、Cd、Cu含量均超过了兰州市土壤背景值。蔬菜中Hg、Cd、Pb、Cr、Cu平均含量分别为0.0037、0.0115、0.0293、0.0226、0.1874 mg·kg-1鲜重,均低于食品中污染物限量标准,它们的单项污染指数分别为0.37、0.06、0.10、0.05、0.02,综合污染指数为0.60,研究区蔬菜重金属污染属于安全级。蔬菜中Hg、Cd、Pb、Cr、Cu平均富集系数分别为0.023、0.033、0.002、0.001、0.006,重金属富集系数的大小顺序为Cd>Hg>Cu>Pb>Cr,Cd在蔬菜中的富集能力最强。成年人食用研究区蔬菜摄入的Hg、Cd、Pb、Cr、Cu平均值分别为1.11、3.45、8.79、6.78、56.22μg·人-1·d-1,分别只占ADI值的2.58%、5.75%、4.11%、3.39%、0.47%。当地居民通过食用蔬菜产生的重金属Hg、Cd、Pb、Cr、Cu健康风险系数分别为0.03、0.06、0.04、0.04、0.01,总健康风险系数为0.17,因此人群长期食用研究区蔬菜所产生的重金属健康风险极低。更多还原

【Abstract】 A systematic survey on Hg,Cd,Pb,Cr and Cu concentrations in four kinds of vegetables( 120 individual samples involved) and their corresponding soils at 30 sampling sites in the fragmentary vegetable plots of Yuzhong county,Gansu Province,was conducted for assessing heavy metals pollution,bio-concentration ability,and potential health risk to local inhabitants due to exposure via consumption of vegetables. The results showed that the average concentrations of Hg,Cd,Pb,Cr and Cu in soils in the studied vegetable plots were 0.159,0.364,15.001,37.633 mg ·kg-1and 31. 298 mg ·kg-1,respectively. Pb and Cr concentrations in soils were all lower than the background values of soil in Lanzhou city,but Hg,Cd and Cu contents were higher. The average concentrations of Hg,Cd,Pb,Cr and Cu in vegetables were 0.0037,0.0115,0.0293,0226 mg·kg-1and 0.1874 mg·kg-1fresh weight( FW),respectively,which were all lower than the maximum levels of contaminants in foods.Their single pollution indexes were 0.37,0.06,0.10,0.05 and 0.02,respectively,and the integrated pollution index was 0.60. The average bio-concentration factors( BCFs) of Hg,Cd,Pb,Cr and Cu in vegetables were 0.023,0.033,0.002,0.001 and 0. 006,respectively,and the order of the BCFs in vegetables was Cd >Hg >Cu >Pb >Cr.The mean daily intake( DI) of Hg,Cd,Pb,Cr and Cu from vegetables was 1.11,3.45,8.79,6.78 μg·d-1and56.22 μg·d-1for adult residents,respectively,which only accounted for 2.58%,5.75%,4.11%,3.39% and 0.47% of acceptable daily intake( ADI),respectively. The target hazard quotients( THQs) of Hg,Cd,Pb,Cr and Cu were 0.03,0.06,0.04,0.04 and 0.01,respectively,and the total THQ( TTHQ) of heavy metals was 0.17.Therefore,the health risk posed by heavy metals was very low for habitants consuming vegetables.更多还原