西宁市常见市售蔬菜中重金属含量的测定

目的]对西宁市常见市售蔬菜进行多种重金属元素的检测,了解当地蔬菜的重金属污染情况.方法]从西宁市市售蔬菜中随机抽取10种蔬菜共40个样品,用火焰原子吸收分光光度计（AA-6200）测定砷（As）、汞（Hg）、铬（Cr）的含量,用石墨炉原子吸收分光光度计（Z-2000）测定铅（Pb）、镉（Cd）的含量,依据《食品中污染物限量》（GB2762-2005）和《农产品安全质量无公害蔬菜安全要求》（GB18406.1-2001）进行评价.结果]试验显示,10种蔬菜中Pb、As、Hg、Cd、Cr的含量平均值范围分别为0.006 8～0.130 0 mg/kg、0.001 8 ～0.025 0 mg/kg、0.000 01 ～0.000 64 mg/kg、O.001 4～0.023 0 mg/kg、0.012～0.110 mg/kg.结论]研究表明,西宁市售蔬菜中Pb、As、Hg、Cd、Cr的重金属污染状况较低,均未超出综合污染指数的范围,达到了国家无公害蔬菜的安全标准.

Determination of Heavy Metal Contents in Common Commercially Available Vegetables in Xining City

Objective] To detect several heavy metals in common commercially available vegetables in Xining City,and obtain the heavy metal pollution in local vegetables.Method] 40 samples of 10 vegetables were randomly picked from Xining markets,and arsen （As）,mercury （Hg）,and chromium （Cr） contents were determined by flame atomic absorption spectrophotometer （AA-6200）,whereas lead （Pb） and cadmium （Cd） contents were determined by graphite furnace atomic absorption spectrophotometer （Z-2000） based on the national standards ＂Contaminants in Foods＂ （GB2762-2005） and ＂ Pollution-free Vegetables and Safety of Agricultural Products Quality and Safety Requirements＂ （GB18406.1-2001）.Result] The results showed that in the 10 kinds of vegetables,Pb,As,Hg,Cd and Cr contents were in the ranges of 0.006 8-0.130 0 mg/kg,0.001 8-0.0250 mg/kg,0.000 01-0.000 64 mg/kg,0.001 4-0.023 0 mg/kg and 0.012-0.110 mg/kg,respectively.Conclusion] Pb,As,Hg,Cd,Cr pollution in vegetables in Xining markets is low,which did not exceed the national standard limits and reached the national safety standard for pollution-free vegetables.