【摘要】 对采自青藏高原部分河水及个别地下水样品中溶解态铀的含量进行了初步研究。采样地点主要包括青海的纳赤台地区及长江源头、藏北地区、雅鲁藏布江流域、西藏中西部内流域、西藏西部狮泉河流域和藏南喜马拉雅流域,共采集水体样品41个。用0.45μm的针式过滤器对样品进行了处理,高分辨电感耦合等离子体质谱仪测定了过滤水中铀的含量。结果表明,不同流域河水中铀的含量范围为0.17～6.53μg/L,均值1.20μg/L,并且存在着明显的区域变化。西藏中西部内流域河水中铀的平均含量最低(0.51μg/L),藏南的外流域地区最高(2.48μg/L),但数据点较少,其次是藏北地区(1.51μg/L)。并对各流域水体中铀含量存在差异的原因进行了讨论。更多还原

【Abstract】 The uranium contents of the dissolve d part in some river waters and ground waters in the Qinghai-Xizang Plateau are discussed.The samples a re mainly collected from Nachitai in Qinghai,the headwater of the Changjiang River,northern Xizang(Tibet),the drainage area of Yarlung Zangbo,the midwestern part of the plateau,the Shiquanhe drainage area and the Hima layan drainage area.The samples were filtered with syringe-type filters with pore size of 0.45μm and the contents of uranium were determined by a Finnigan MAT Element ICP-MS.The contents of uranium in river waters r ange from 0.17μg /L to 6.53μg /L,with a mean value of 1.20μg /L,which is higher than that in some rivers of t he world and there is a large change of uranium content in different region s.The lowest mean content (0.51μg /L)is found in the midwestern Xizang and the highest one(2.48μg /L)in the Himalayan drainage area.The fac tors that result in large change of ur anium content in different regions a re also discussed.更多还原