公开(公告)号：WO2015023362A1

公开(公告)日：2015-02-19

申请号：PCT/US2014/043419

申请日：2014-06-20

Applicant: HACH COMPANY

Inventor： ISMAIL, Ibrahim ,  HERTEL, Matthew ,  SWANSON, Teresa, L.

IPC: G01N33/00 ,  G01N33/18

CPC classification number: B32B38/164 ,  G01N31/224 ,  Y10T436/193333

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.

Abstract translation: 用于确定水样品中游离和总氯浓度水平的测试元件（10）包括粘附到基底（14）的测试垫（12），其中用稳定的DPD溶液浸渍测试垫（12）。 测试垫（12）对水中氯的不同浓度水平进行颜色响应，并与比色图进行比较，以确定水中游离氯和/或总氯的含量。 稳定的DPD溶液可以包括N，N-二乙基 - 对苯二胺草酸盐，聚合酐如甲基 - 乙烯基酐和有机硫酸酯如二甲基砜。