title: Developing LED UV fluorescence sensors for online monitoring DOM and predicting DBPs formation potential during water treatment.
abstract: Online monitoring dissolved organic matter (DOM) is urgent for water treatment management. In this study, high performance size exclusion chromatography with multi-UV absorbance and multi-emission fluorescence scans were applied to spectrally characterize samples from 16 drinking water sources across Yangzi River and Huai River Watersheds. The UV absorbance indices at 254 nm and 280 nm referred to the same DOM components and concentration, and the 280 nm UV light could excite both protein-like and humic-like fluorescence. Hence a novel UV fluorescence sensor was developed out using only one UV280 light-emitting diode (LED) as light source. For all samples, enhanced coagulation was mainly effective for large molecular weight biopolymers; while anion exchange further substantially removed humic substances. During chlorination tests, UVA280 and UVA254 showed similar correlations with yields of disinfection byproducts (DBPs); the humic-like fluorescence obtained from LED sensors correlated well with both trihalomethanes and haloacetic acids yields, while the correlation between protein-like fluorescence and trihalomethanes was relatively poor. Anion exchange exhibited more reduction of DBPs yields as well as UV absorbance and fluorescence signals than enhanced coagulation. The results suggest that the LED UV fluorescence sensors are very promising for online monitoring DOM and predicting DBPs formation potential during water treatment.
authors.affiliation: State Key Laboratory of Pollution Control and Resources Reuse, Collaborative Innovation Center for Advanced Water Pollution Control Technology and Equipment, School of the Environment, Nanjing University, Nanjing, 210023, China.
authors.forename: Wen-Tao
authors.initials: WT
authors.lastname: Li
authors.affiliation: State Key Laboratory of Pollution Control and Resources Reuse, Collaborative Innovation Center for Advanced Water Pollution Control Technology and Equipment, School of the Environment, Nanjing University, Nanjing, 210023, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Jin
authors.affiliation: State Key Laboratory of Pollution Control and Resources Reuse, Collaborative Innovation Center for Advanced Water Pollution Control Technology and Equipment, School of the Environment, Nanjing University, Nanjing, 210023, China.
authors.forename: Qiang
authors.initials: Q
authors.lastname: Li
authors.affiliation: Jiangsu Provincial Key Lab of Advanced Photon & Electronic Material, School of Electronic Science and Engineering, Nanjing University, Nanjing, 210023, China.
authors.forename: Chen-Fei
authors.initials: CF
authors.lastname: Wu
authors.affiliation: Jiangsu Provincial Key Lab of Advanced Photon & Electronic Material, School of Electronic Science and Engineering, Nanjing University, Nanjing, 210023, China.
authors.forename: Hai
authors.initials: H
authors.lastname: Lu
authors.affiliation: State Key Laboratory of Pollution Control and Resources Reuse, Collaborative Innovation Center for Advanced Water Pollution Control Technology and Equipment, School of the Environment, Nanjing University, Nanjing, 210023, China. Electronic address: zhouqing@nju.edu.cn.
authors.forename: Qing
authors.initials: Q
authors.lastname: Zhou
authors.affiliation: State Key Laboratory of Pollution Control and Resources Reuse, Collaborative Innovation Center for Advanced Water Pollution Control Technology and Equipment, School of the Environment, Nanjing University, Nanjing, 210023, China. Electronic address: liaimin@nju.edu.cn.
authors.forename: Ai-Min
authors.initials: AM
authors.lastname: Li
mesh_terms: D000085:Acetates / Q000032:analysis; D015374:Biosensing Techniques / Q000295:instrumentation / Q000379:methods*; D002850:Chromatography, Gel; D004202:Disinfectants / Q000032:analysis*; D004203:Disinfection / Q000379:methods; D060766:Drinking Water / Q000032:analysis*; D006812:Humic Substances / Q000032:analysis; D006846:Hydrocarbons, Halogenated / Q000032:analysis; D054023:Lasers, Semiconductor; D009930:Organic Chemicals / Q000032:analysis; D015203:Reproducibility of Results; D045483:Rivers / Q000737:chemistry; D013050:Spectrometry, Fluorescence; D013056:Spectrophotometry, Ultraviolet; D022882:Trihalomethanes / Q000032:analysis; D014874:Water Pollutants, Chemical / Q000032:analysis*; D018508:Water Purification / Q000295:instrumentation / Q000379:methods*
chemical_list: D000085:Acetates; D004202:Disinfectants; D060766:Drinking Water; D006812:Humic Substances; D006846:Hydrocarbons, Halogenated; D009930:Organic Chemicals; D022882:Trihalomethanes; D014874:Water Pollutants, Chemical; C006972:chloroacetic acid
keywords: Disinfection byproducts; Dissolved organic matter; Excitation emission matrix; LED UV fluorescence sensor; Online monitoring; UV absorbance