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利用萃取、共沉淀和离子交换色层法相结合的化学分离方法 ,成功地实现了淡水中无机三价砷 (As(Ⅲ ) )、五价砷 (As(Ⅴ ) )、甲基胂酸 (MMA)和二甲基胂酸 (DMA) 4种化学种态的分离 ,用中子活化法 (NAA)测定了各分离部分中的As。其检出限为 0 0 2 μg/L。用此法对阿克巴盟地方性砷中毒 (地砷病 )病区井水中砷的 4种主要化学种态及其它微量元素进行了测量。结果表明 :病区饮用水中总砷的质量浓度为 2 0 4～ 1 1 2 5 μg/L ,严重超过了国家饮用水水质标准 ( <5 0 μg/L) ;井水中的砷大多以无机砷形式存在 ,其中As(Ⅲ )为总砷的 6 2 %～ 87% ;有机胂含量较低 ,MMA和DMA所占比例之和为 1 %～ 6 % ;Fe、Ba质量浓度明显高于饮用水的水质标准 ,稀土元素的质量浓度为世界淡水元素背景值的几十到几百倍。
Arsenic trioxide (As (Ⅲ)), pentavalent arsenic (As (Ⅴ)), methylarsonic acid (MMA) were successfully obtained by chemical separation method which combined extraction, coprecipitation and ion exchange chromatography. ) And dimethylarsinic acid (DMA). The As content in each fraction was determined by neutron activation (NAA). The detection limit was 0 0 2 μg / L. Using this method, four main chemical species and other trace elements of arsenic in well water of endemic arsenic poisoning (Arsenicosis) in Akba alliance were measured. The results showed that the total concentration of arsenic in drinking water in the ward ranged from 204 to 115.25 μg / L, which seriously exceeded the national drinking water quality standard (<50 μg / L) As (Ⅲ) is 6 2% ~ 87% of the total arsenic; the content of organic arsine is low, the proportion of MMA and DMA is 1% ~ 6%; the concentration of Fe, Ba is obviously higher than that of drinking Water quality standards, the mass concentration of rare earth elements of the world’s freshwater background value of dozens to hundreds of times.