【摘要】 以天然水体底泥提取的腐殖酸（HA）为研究对象，进行超滤膜分级，对不同分子量区间的HA进行氯化，考察其三卤甲烷生成能力（THMsFP）以及氯化过程中UV254、A265/A465、A465/A665和红外谱图的变化情况。结果表明：不同分子量级别的HA样品具有相似的结构，但其含氧官能团数量随分子量降低呈现增加趋势。氯化反应破坏了多重聚合苯环结构，生成了饱和脂肪烃类结构、烯烃类不饱和C=C结构、C=O、C-O官能团和C-Cl、C-Br结构。由于不同分子量范围HA的C=C不饱和结构和C-O官能团数量不同，导致各个分子量HA的THMsFP产率和其溴代贡献因子不同。其中10～30 kDa的HA具有最大的THMsFP产率和最小的溴代贡献因子。更多还原

【Abstract】 The humic acid(HA) extracted from the sediment was separated by ultrafiltration, and chlorinated subsequently. The trihalomethanes formation potential(THMsFP) UV-Vis and infrared spectrum of HA fractions with different molecule weight(MW) were analyzed. The results showed that the HA samples with different MW levels had similar structures, while the number of oxygen-containing functional groups increases while decreasing the MW. The aromatic structures were destroyed and the aliphatic hydrocarbon structures, olefin unsaturated structures, C=O, C-O and C-Cl,C-Br structures were formed during chlorination. The amount of THMsFP yields and bromine incorporation in THMs, n(Br)THMs, were affected by unsaturated structures and C-O functional groups in HA fractions with different MW. The HA with MW between 10～30 kDa had the highest THMsFP yields and lowest n(Br)THMs.更多还原