作者为了比较不同人种指甲中各种元素的含量,选择日本、印度、美国、加拿大及波兰不同人种的5个国家的居民作为调查对象。在分析指甲中21种元素的同时,用调查卡片法平行地进行了有关生活环境等的调查。采集的指甲用据美国环境保护局的洗净法改良的丙酮—3%H_2O_2乙醇—水—丙酮法进行清洗。风干后用硝酸—高氯酸湿式灰化法处理后,用ICP In order to compare the content of various elements in different ethnic nails, the authors selected residents of five countries of different races in Japan, India, the United States, Canada and Poland as the survey subjects. In addition to analyzing the 21 elements in the nails, a survey on the living environment was conducted in parallel with the survey card method. The collected nails were washed according to the acetone-3% H 2 O 2 ethanol-water-acetone method modified by the washing method of the United States Environmental Protection Agency. After air-dried with nitric acid - perchloric acid wet ashing treatment, with ICP