Chlorine analytical test element and a stabilized N, N-diethyl-p-phenylenediamine solution
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United States of America Patent
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Jan 17, 2017
Grant Date -
Feb 19, 2015
app pub date -
Jun 20, 2014
filing date -
Aug 16, 2013
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Abstract
A test element (10) used to determine concentration levels of free and total chlorine in a water sample comprises a test pad (12) adhered to a substrate (14), wherein the test pad (12) is impregnated with a stabilized DPD solution. The test pad (12) is color responsive to different concentration levels of chlorine in the water and compared to a color chart to determine the level of free chlorine and/or total chlorine in the water. The stabilized DPD solution may include N,N-diethyl-p-phenylenediamine oxalate salt, a polymeric anhydride such as a methyl-vinyl anhydride and an organo-sulfate such as dimethylsulfone.
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