对平凉市蔬菜产地2006 — 2011年抽取的22个灌溉水源样品进行重金属含量检测。结果表明，平凉市蔬菜产地灌溉水源重金属污染程度由大到小依次为Hg、Pb、Cr、As、Cd，单项污染指数均小于0.7，综合污染指数为0.065 1，说明平凉市蔬菜产地灌溉水源安全清洁的，水源环境适宜于蔬菜产业开发。

The 22 irrigation water samples on vegetables production is extracted for dectection of heavy metals in Pingliang city from 2006 to 2011 years. From high to low， the pollution degree of heavy metals in irrigation water is Hg， Pb， Cr， As， Cd in vegetable production in PingLiang city， the single pollution index of these heavy metals is less than 0.7，and the comprehensive pollution index is 0.065 1. The result shows that the water of vegetable irrigation is safe and clean in PingLiang city and the water environment suitable for development of vegetable industry.

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