京密引水中不同形态天然有机物的卤代活性

用过滤、XAD－8和XAD－4树脂串联吸附等方法将京密引水中的天然有机物定量分离为悬浮固体、憎水有机物、腐殖酸类化合物，XAD－4酸和其它亲水有机物。分别对不同形态有机物进行氯化处理，测定了产物中的挥发性卤代烃。结果表明，京密引水中天然有机物的主要挥发性氯化产物是氯仿，此外还生成一溴、二溴氯甲烷及少量溴仿。溶解态腐殖酸类化合物的悬浮固态和悬浮固态有机物是生成氯仿的最主要母体。亲水有机酸也具有较高的卤代活性，而其它有机成分则表现出相对惰性。

Halogenated organics from various fractions of natural organic compounds in water from Jingmi Canal

Total natural organic carbon in water from Jingmi Canal was separted into several fractions of suspended solid organic compounds, hydrophobic compounds, humic substances, XAD-4 acids and other and other hydrophilic organics. The individual fractions were chlorinated and the volatile halogented compounds generated during the chioriation were determined. The primary product of the chlorination was chloroform. Bromodichloromethane, dibromochlomethane and tribromomethane were detected as well. The humic substances and the suspended solid organics were the moot important precursors of chloroform i the dissolved hydrophilic acids also possessed high halogenated activity:while other organic solutes showed relative inertia.