Assessment of drinking water quality at the tap using fluorescence spectroscopy.
Journal article, 2017

Treated drinking water may become contaminated while travelling in the distribution system on the way to consumers. Elevated dissolved organic matter (DOM) at the tap relative to the water leaving the treatment plant is a potential indicator of contamination, and can be measured sensitively, inexpensively and potentially on-line via fluorescence and absorbance spectroscopy. Detecting elevated DOM requires potential contamination events to be distinguished from natural fluctuations in the system, but how much natural variation to expect in a stable distribution system is unknown. In this study, relationships between DOM optical properties, microbial indicator organisms and trace elements were investigated for households connected to a biologically-stable drinking water distribution system. Across the network, humic-like fluorescence intensities showed limited variation (RSD = 3.5-4.4%), with half of measured variation explained by interactions with copper. After accounting for quenching by copper, fluorescence provided a very stable background signal (RSD < 2.2%) against which a ∼2% infiltration of soil water would be detectable. Smaller infiltrations would be detectable in the case of contamination by sewage with a strong tryptophan-like fluorescence signal. These findings indicate that DOM fluorescence is a sensitive indicator of water quality changes in drinking water networks, as long as potential interferents are taken into account.

Author

Masoumeh Heibati

Chalmers, Civil and Environmental Engineering, Water Environment Technology

Colin A Stedmon

Karolina Stenroth

Sebastien Rauch

Chalmers, Civil and Environmental Engineering, Water Environment Technology

Jonas Toljander

Melle Säve-Söderbergh

Kathleen Murphy

Chalmers, Civil and Environmental Engineering, Water Environment Technology

DRICKS - Framework programme for drinking water research at Chalmers

Water research

1879-2448 (ISSN)

Vol. 125 1-10

Driving Forces

Sustainable development

Areas of Advance

Building Futures (2010-2018)

Subject Categories

Earth and Related Environmental Sciences

Environmental Sciences

DOI

10.1016/j.watres.2017.08.020

PubMed

28822814

More information

Latest update

2/2/2018 9