Trihalomethane yields as a function of precursor molecular weight

Molecular size distribution of dissolved organic matter in water of the Pearl River and trihalomethane formation characteristics with chlorine and chlorine dioxide treatments

“…Molecular weight of most DOM in the Pearl River water sample was <500 Dalton (Da) and its percentage reached 58%. This is quite different from other water samples as reported by Schnoor et al [35] and Amy et al [36]. Natural organic matter consists of humic and fulvic acids and the latter is the majority of the DOM in the water sample according to Schnitzer [37] and its molecular weight is greater than 700.…”

The Safety of Water Disinfection

“…Oliver & Visser concluded that low molecular weight humic material in natural waters is responsible for most of the THMs formed during chlorination. This is in agreement with the results reported by Schnoor et al (20), who fractionated humic matter from river water and found that about 75% of the THMs were generated by the material below mol wt 3,000 .…”

Disinfection characteristics of the dissolved organic fractions at several stages of a conventional drinking water treatment plant in Southern China

“…This result was consistent with Benner's [39] report in which 75% of marine organic carbon were low-molecular weight DOM and 24% were high-molecular-weight DOM. However, Martin-Mousset and co-workers [40,41] showed that organics >1000 Da generally accounted for up to 70-80% of the total DOC in natural surface water, which was different from other water samples (Schnoor [42], Amy [43], Vuorio [12] and Chang [44]). In addition, soil humic acid fractions with >300 kDa and 30-100 kDa contained 52% and 34% of total carbon, respectively [33].…”