Patent ID: 8987000
Filing Date: 2015-03-24
Classification: G01N,Y10T

Abstract:
1. A heat dried reagent composition for use in detecting and/or assessing free chlorine in an aqueous solution, the composition comprising: i) an indicator comprising N,N-diethyl-p-phenylenediamine (DPD) in an amount sufficient to detect and/or assess 0.01 to 20 parts per million (ppm) free chlorine in an aqueous reaction solution; ii) an anionic or nonionic surfactant; iii) ethylenediaminetetraacetic acid (EDTA); iv) trehalose; and v) a pH 6-7 buffer in an amount sufficient to obtain a pH of 5.5 to 7.5 in the aqueous reaction solution; wherein the composition is dry.