ABSTRACT
Schnoor et al. [1] have determined the apparent molecular weight range of trihalomethane precursor compounds in the Iowa river and a reservoir near Iowa City. Soluble organics were size fractionated by gel permeation chromatography and the fractions were chlorinated and analysed for trihalomethane yields by electron-capture gas chromatography. Of the trihalomethanes formed, 75% were derived from organics of molecular weight less than 3000 and 20% from those of molecular weight less than 1000.
