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Analysis of free chlorine in aqueous solution at very low concentration with lateral flow tests.

Schwenke, K. Uta and Spiehl, Dieter and Krauße, Marcel and Riedler, Laura and Ruppenthal, Anna and Villforth, Klaus and Meckel, Tobias and Biesalski, Markus and Rupprecht, Daniel and Schwall, Gerhard (2019):
Analysis of free chlorine in aqueous solution at very low concentration with lateral flow tests.
In: Scientific reports, 9 (1), p. 17212, ISSN 2045-2322,
DOI: 10.1038/s41598-019-53687-0,
[Online-Edition: https://doi.org/10.1038/s41598-019-53687-0],
[Article]

Abstract

Test strips are convenient tools for rapid, semi-quantitative analysis of a variety of parameters by dipping them for a few seconds in a sample solution followed by a simple colorimetric read-out. Their sensitivity is mainly determined by the reactivity of the test dyes on the reaction zone and is not sufficient for some applications. The detection limit of commercially available free chlorine test strips, for example, is at present not low enough to confirm the absence of this analyte as disinfectant in rinsing solutions after disinfection or to control required residual amounts of chlorine in drinking water. Therefore, we developed a user-friendly lateral flow test which is capable to detect very low amounts of free chlorine. The latter relies on a larger sample volume passing the reaction zone as compared to simple dip test strips. An amount of as low as 0.05 ppm chlorine can, however, only be detected if oxidation stable flow test substrates are used. The eventually developed flow test reaches a 10x higher sensitivity than a commercial dip test. The result is obtained within 4-5 min flow time, whereby no action is required by the user during this analysis time.

Item Type: Article
Erschienen: 2019
Creators: Schwenke, K. Uta and Spiehl, Dieter and Krauße, Marcel and Riedler, Laura and Ruppenthal, Anna and Villforth, Klaus and Meckel, Tobias and Biesalski, Markus and Rupprecht, Daniel and Schwall, Gerhard
Title: Analysis of free chlorine in aqueous solution at very low concentration with lateral flow tests.
Language: English
Abstract:

Test strips are convenient tools for rapid, semi-quantitative analysis of a variety of parameters by dipping them for a few seconds in a sample solution followed by a simple colorimetric read-out. Their sensitivity is mainly determined by the reactivity of the test dyes on the reaction zone and is not sufficient for some applications. The detection limit of commercially available free chlorine test strips, for example, is at present not low enough to confirm the absence of this analyte as disinfectant in rinsing solutions after disinfection or to control required residual amounts of chlorine in drinking water. Therefore, we developed a user-friendly lateral flow test which is capable to detect very low amounts of free chlorine. The latter relies on a larger sample volume passing the reaction zone as compared to simple dip test strips. An amount of as low as 0.05 ppm chlorine can, however, only be detected if oxidation stable flow test substrates are used. The eventually developed flow test reaches a 10x higher sensitivity than a commercial dip test. The result is obtained within 4-5 min flow time, whereby no action is required by the user during this analysis time.

Journal or Publication Title: Scientific reports
Volume: 9
Number: 1
Divisions: 10 Department of Biology
10 Department of Biology > Membrane Dynamics
16 Department of Mechanical Engineering
16 Department of Mechanical Engineering > Institute of Printing Science and Technology (IDD)
16 Department of Mechanical Engineering > Fachgebiet für Papierfabrikation und Mechanische Verfahrenstechnik (PMV)
07 Department of Chemistry
07 Department of Chemistry > Fachgebiet Makromolekulare Chemie
Date Deposited: 25 Nov 2019 13:33
DOI: 10.1038/s41598-019-53687-0
Official URL: https://doi.org/10.1038/s41598-019-53687-0
Identification Number: pmid:31748632
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