摘要目的 分析确定吉林省地方性砷中毒病区饮用水中砷的存在形态,为吉林省地方性砷中毒病情形成原因提供科学依据.方法 选择吉林省洮南市、通榆县的饮水型砷中毒病区和高水砷区作为调查点,采集居民饮用水水样,对水样中砷含量及不同形态砷化物进行测定,并分析水并深度和水砷含量的关系.结果 共检测水样161份,其中,5价砷离子(As5+)含量范围为0.004 ～ 0.226 mg/L,中位数为0.053 mg/L;3价砷离子(As3+)含量范围为0.004～ 0.309 mg/L,中位数为0.057 mg/L;总砷含量范围为0.009 ～ 0.509 mg/L,中位数为0.100 mg/L.有1份水样检出一甲基砷(MMA),含量为0.005 mg/L;有1份水样检出二甲基砷(DMA),含量为0.014 mg/L.调查水井101个,井深在13～ 75m,水砷含量≥0.05 mg/L的94份,主要集中在井深≥50m的水井中,占85.1％(80/94).结论 饮用水中砷主要以无机砷形式存在,有机砷仅个别以低含量水平存在于水中,高含量水砷集中在深井中.

abstractsObjective To identify the morphology of arsenic in drinking water,by detecting arsenic in the drinking water within the endemic areas so as to determine the causes of arsenic through different forms of arsenic exposure.Methods The arsenic poisoning area and the high arsenic arsenic area in Taonan City and Tongyu County of Jilin Province were selected as the survey sites.The drinking water samples were collected,and the arsenic content and different arsenic species in the water samples were measured and analyze the relationship between well depth and water arsenic content.Resets A total of 161 arsenic water samples were tested,mainly in the form of inorganic arsenic;As5+ concentration was 0.004 to 0.226 mg/L,the median was 0.053 mg/L;the As3+ concentration was 0.004 to 0.309 mg/L,the median was 0.057 mg/L.Total arsenic content was in the range of 0.009 to 0.509 mg/L,the median was 0.100 mg/L.Monomethylated arsenic (MMA) was detected in 1 water sample with the content of 0.005 mg/L,dimethyl arsine (DMA) was detected in 1 water sample with the content of 0.014 mg/L.Totally 101 wells were surveyed with the depth of 13 to 75 meters.Totally 94 water samples had the water arsenic level of more than 0.05 mg/L,and most of them were detected in the well with the depth of more than 50 meters,which was accounted for 85.1％ (80/94).Conclusions Arsenic mainly exists in the form of inorganic arsenic in drinking water,organic arsenic is only found in water at low concentrations.Excessive water arsenic is mainly distributed in wells deeper.