Incidents of heavy metals pollution in water have been happened recentaly. Pertreatment of water sample is essential to make a accurate test. Based on a large number of environmental monitoring data of drinking water source area in Jiangsu,the effects of sample's different pretreatment procedure( filtration,acid preservation) on the test results were compared for Fe,Mn and Hg in water. It was suggested that in order to evaluate the test results by existing environment quality standards,the water sample of F...