中文摘要：

用超滤膜法对以东江为水源的深圳水库水体溶解性有机物（DOM）进行物理分级表征，研究了2005年3-9月原水中DOM分子量分布的连续变化特性，以及各分子量范围的DOM组分与消毒副产物三卤甲烷生成势（THMFP）之间的关系．结果表明，在此原水DOM中，相对分子量小于1000的有机物所占比例最高（平均值为41．15％（以DOC计）），这说明东江原水中DOM主要以小分子量有机物为主，此分子量范围有机物所产生的THMFP在原水中所占比例均值为32．23％．水处理研究表明，常规工艺和深度处理工艺对其DOC和THMFP的去除率均不高．对原水总DOC的贡献占第二位的是分子量在10^4-3×10^4之间的有机物（均值为24．07％），其对总THMFP的贡献率为29．09％。常规工艺对此分子量范围有机物去除效果很好．

英文摘要：

The apparent molecular - weight （MW） distribution of dissolved organic matter （DOM） in Shenzhen reservoir supplied by Dongjiang river was studied by uhra - filtration method. And the variety of apparent MW of the DOM and the relationship between apparent MW and trihalomethane formation potential （THMFP） were also investigated with the water samples during the period from March 2005 to September 2005. As showed in the results, the an apparent MW lower than 1kDa had the largest ratio in the total, DOC （ dissolved organic carhon） of the water, with the medial value of 41.15% , where the average percentage of THMFP is 32.23%. Whereas the conventional and advanced treatment processes cannot remove the organics effectively. The ratio of the organics with an apparent MW in 10k -30kDa was 24.07% in the total DOC, and an average 29.09% in which was the total THMFP. The conventional processes can remove these organics effectively.