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文章介绍了1970年秋在美国五个不同污染程度的城市调查非职业接触者(学龄儿童)的血和发中的砷、镉、铜、铅、锌的含量水平。调查中发样的洗涤方法:洗液有三种①洗净剂溶液(每加仑蒸馏水中加5克月桂乙酰钠;②酒精(95%乙醇);③EDTA液(每加仑双蒸水中1克EDTA,用醋酸调至pH 3)。发样在洗净剂溶液中(200毫升)浸泡一小时后在蒸馏水中漂洗和搅动三次。或放到酒精中3～5分钟后再用蒸馏水漂洗三次。或发样加EDTA溶液200毫升,
The article describes the levels of arsenic, cadmium, copper, lead, and zinc in blood and hair from non-occupational contacts (school-age children) surveyed in the autumn of 1970 in five US cities of different levels of pollution. In the survey, the samples were washed in the following three ways: (1) detergent solution (5 g laureth sodium per gallon of distilled water; 2) alcohol (95% ethanol); 3 EDTA liquor (1 g EDTA per gallon of double distilled water Acetic acid adjusted to pH 3) Hair samples were soaked in detergent solution (200 ml) for one hour, rinsed and agitated three times in distilled water or placed in alcohol for three to five minutes and then rinsed three times with distilled water Add EDTA solution 200 ml,