中文摘要：

利用ICP—MS测定技术和分级提取形态分析手段对珠江某处沉积物中痕量重金属铊的化学形态进行了考察．结果表明，铊以酸可交换态、可还原态、可氧化态和残余态在上、中、下层沉积物中均有分布；且上层沉积物中铊主要分布在残余态，在其余各形态中的分布基本相近；在中层沉积物中铊主要分布在残余态，其次是可还原态、酸可交换态以及可氧化态；下层主要分布在可氧化态，其次是残余态、酸可交换态以及可还原态．由此推测，该处沉积物当前未受到明显的铊污染．

英文摘要：

The chemical form of trace heavy metal thallium in sediment core from Pearl River was studied by the ICP-MS method and sequential analysis. As shown in the result, the acid exchangeable, reducible, oxidable and residual forms of thallium all existed in the up, middle and down bottom stratum of the sediment core. And in the top stratum, thallium mainly existed as the residual form and the content of thallium in the other forms is similar; in the middle stratum, thallium also mainly existed as the residual form followed by the reducible, acid exchangeable and oxidable; in the down bottom stratum, and thallium mainly existed as the oxidable form followed by the residual, acid exchangeable and reducible. It is speculated that the sediment core is not polluted by thallium at present.