中文摘要：

通过系统地采集森格藏布和雅鲁藏布地表水样,研究了两流域水体中砷的分布.结果表明不同水体中砷的含量不同,其由高至低依次为：热泉水（4 920μg.L-1±1 520μg.L-1,n=2）〉盐（咸）水湖水（2 180μg.L-1±3 840μg.L-1,n=7）〉井水（194μg.L-1,n=1）〉淡水湖水（163μg.L-1±202μg.L-1,n=2）〉河水（35.5μg.L-1±57.0μg.L-1,n=74）,森格藏布和雅鲁藏布上游存在高砷河水,森格藏布河水砷平均含量（58.4μg.L-1±69.9μg.L-1,n=39）明显高于雅鲁藏布（10.8μg.L-1±16.9μg.L-1,n=30）.采集的热泉水、盐咸湖水、井水以及43.2%的河水样品中砷的含量均高于10μg.L-1,森格藏布和雅鲁藏布分别为两流域内居民重要的饮用水源,居民具有患上地方性砷中毒的风险.

英文摘要：

This research was aimed on studying the arsenic distribution of water in Yarlung Zangbo and Singe Zangbo basins in Tibet.Results showed that arsenic concentrations were different in different types of the water.The sequence of arsenic concentration from high to low was hot spring water（4 920 μg·L-1±1 520 μg·L-1,n=2）,salt lake water（2 180 μg·L-1±3 840 μg·L-1,n=7）,well water（194 μg·L-1,n=1）,freshwater lake water（163 μg·L-1±202 μg·L-1,n=2） and stream water（35.5 μg·L-1±57.0 μg·L-1,n=74）.The high arsenic concentration in surface water in Singe Zangbo and the upstream of Yarlung Zangbo were found.The average concentration of arsenic in water from Singe Zangbo（58.4 μg·L-1±69.9 μg·L-1,n=39） was significantly higher than that from Yarlung Zangbo（10.8 μg·L-1±16.9 μg·L-1,n=30）.Arsenic concentration in 43.2% of stream water samples and all of the hot springs,saline lakes and well water were higher than 10 μg·L-1.Yarlung Zangbo and Singe Zangbo are important sources of drinking water for the local people.There is a high risk for the local people who may suffer from chronic arsenic poisoning.