果蔬中Cu、Pb、Ni、Cr、Cd和Co含量的测定及评价

Determination and Assessment of Cu,Pb,Ni,Cr,Cd and Co Concentration in Fruits and Vegetables

以8种果蔬(9种样品)为研究对象,采用湿法消解,建立了ICP-AES同时检测铜、钴、镍、铬、镉和铅六种重金属元素含量的测定方法。在最优条件下,实验结果表明:Cu、Pb、Ni、Cr、Cd和Co的检出限分别为0.0015μg.mL-1、0.024μg.mL-1、0.0042μg.mL-1、0.0033μg.mL-1、0.0006μg.mL-1和0.0021μg.mL-1,相对标准偏差介于0.12%～10.29%之间,加标回收实验中回收率均介于89.4%～108.6%之间(土豆中Ni的回收率为123.7%)。根据国家食品卫生标准中的果蔬类标准,通过分析得出,Cr、Cd两种重金属元素污染比较严重,对居民的身体健康存在潜在的威胁。

Eight kinds of fruits and vegetables （ nine kinds of sample） as the research objects, using wet digestion, a method of simultaneous detection of the concentration of six heavy elements Cu, Pb, Ni, Cr, Cd, and Co using ICP-AES was established. Under optimal conditions, the experimental results showed that the detection limits of Cu, Pb, Ni, Cr, Cd and Co were 0. 0015 μg · mL^-1 , 0. 024 μg - mL^-1 , 0. 0042 μg · mL^-1 , 0. 0033 μg · mL^-1 , 0. 0006 μg · mL-land 0. 0021 μg · mL^-1 respectively. Relative standard deviation was between 0. 12% and 10. 29% , recoveries ranged from 89.4% to 108.6% （ the recovery of Ni in potatoes was 123.7% ）. According to the national food hygiene standards in the fruit and vegetable standards, the results showed that pollution was more serious of the two heavy metal el- ements Cr and Cd, causing a potential threat to the physical health of the residents.