期刊
SENSORS
卷 20, 期 11, 页码 -出版社
MDPI
DOI: 10.3390/s20113099
关键词
chlorine; pH; microfluidic; photometric; online; swimming pool
资金
- Tekelek Australia Pty Ltd. [IVP 129, FIA003]
- Government of South Australia [IVP 129, FIA003]
- Australian Academy of Science
- Australian Government under the National Innovation and Science Agenda
A microfluidic sensor was studied for the photometric detection of active chlorine, total chlorine, and pH in swimming pool samples. The sensor consisted of a four-layer borosilicate glass chip, containing a microchannel network and a 2.2 mm path length, 1.7 mu L optical cell. The chip was optimised to measure the bleaching of methyl orange and spectral changes in phenol red for quantitative chlorine (active and total) and pH measurements that were suited to swimming pool monitoring. Reagent consumption (60 mu L per measurement) was minimised to allow for maintenance-free operation over a nominal summer season (3 months) with minimal waste. The chip was tested using samples from 12 domestic, public, and commercial swimming pools (indoor and outdoor), with results that compare favourably with commercial products (test strips and the N,N ' -diethyl-p-phenylenediamine (DPD) method), precision pH electrodes, and iodometric titration.
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