公开(公告)号：US20240230609A1

公开(公告)日：2024-07-11

申请号：US18151161

申请日：2023-01-06

Applicant: HACH COMPANY

Inventor： Douglas ROYER ,  Melinda Buyck ,  Sarah Anciaux ,  Devin Maurer

IPC: G01N31/22 ,  C07C59/245 ,  C07C211/51 ,  G01N21/78

CPC classification number: G01N31/22 ,  C07C59/245 ,  C07C211/51 ,  G01N21/78

Abstract: A kit is described that can be used for measuring free chlorine in water. The kit includes a buffer with potassium maleate and an indicator. A method for measuring a concentration of free chlorine in a water system includes adding an indicator and a buffer with potassium maleate to a water sample collected from the water system, measuring a light absorbance of the water sample after the indicator and the buffer have been added to the water sample, and determining a concentration of the free chlorine in the water system based on the measured light absorbance.

公开(公告)号：US20240219309A1

公开(公告)日：2024-07-04

申请号：US18090163

申请日：2022-12-28

Applicant: HACH COMPANY

Inventor： Douglas ROYER

IPC: G01N21/78 ,  G01N33/18

CPC classification number: G01N21/78 ,  G01N33/18

Abstract: A reagent for chlorine analysis includes N,N-diethyl-p-phenylenediamine (DPD), an inorganic chloride salt at a concentration of 0.5 M or more, and water. Additionally, a method for detecting chlorine in an aqueous sample includes subjecting a test sample to photometry. The test sample includes the aqueous sample; and a DPD reagent that includes DPD, an inorganic chloride salt at a concentration of 0.5 M or more, and water. The reagent and detection method can be used with minimal or no strong acids.