Seasonal variations of chemical and physical characteristics of dissolved organic matter and trihalomethane precursors in a reservoir: a case study.
Dissolved organic matter (DOM) and its potential to form disinfection by-products (DBPs) during water treatment are of great public health concern. Understanding the seasonal changes in DOM composition and their reactivity in DBP formation could lead to a better treatment of drinking water and a more consistent water quality. DOM from the East-Lake, a reservoir in the south-China, was fractionated and characterized by XAD resin adsorption (RA) and ultrafiltration (UF) techniques during different seasons within a year. The properties of chemical fractions (isolated by RA) appeared more stable than those of physical fractions (separated by UF) throughout the sampling period. The relative contribution of each chemical fraction to the total dissolved organic carbon (DOC), UV(254) absorbance and trihalomethane formation potential (THMFP) remained relatively constant across the sampling period. However, the physical (molecular weight) fractions of the DOM exhibited large seasonal changes in UV(254) and THMFP. Compared to the parameter of DOC, the THMFP and specific THMFP (STHMFP) of either chemical or physical fractions were more variable. In terms of DOC concentration, the hydrophobic acids (HoA) and hydrophilic matter (HiM) dominated in the DOM in most of the seasons; while the components with molecular weight of 10-30 kDa and less than 1 kDa were the predominant physical fractions.
Wei
Qun-shan
QS
State Key Lab of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, P.O. Box 2871, Beijing 100085, China.
Feng
Cheng-hong
CH
Wang
Dong-sheng
DS
Shi
Bao-you
BY
Zhang
Li-tian
LT
Wei
Qia
Q
Tang
Hong-xiao
HX
D000327:Adsorption; D002681:China; D004784:Environmental Monitoring / Q000379:methods*; D005068:Eutrophication; D009930:Organic Chemicals / Q000032:analysis* / Q000737:chemistry; D012621:Seasons; D012995:Solubility; D022882:Trihalomethanes / Q000032:analysis* / Q000737:chemistry; D014462:Ultrafiltration; D014873:Water Pollutants / Q000032:analysis* / Q000737:chemistry; D014881:Water Supply
D009930:Organic Chemicals; D022882:Trihalomethanes; D014873:Water Pollutants