公开(公告)号：WO2022212650A1

公开(公告)日：2022-10-06

申请号：PCT/US2022/022753

申请日：2022-03-31

Applicant: HACH COMPANY

Inventor： RAJASEKHARAN, Vishnu, Vardhanan ,  JACKSON, Cary, Burton

IPC: G01N31/00 ,  G01N33/18 ,  G01N27/27 ,  G01N27/302 ,  G01N27/308 ,  G01N27/44 ,  G01N31/005 ,  G01N31/22 ,  G01N33/182 ,  G01N33/1846

Abstract: Method and apparatus for deriving an alkalinity measurement, including: introducing a fluid sample; measuring, a phosphate amount of the fluid sample using a colorimetric reagent; measuring a pH of the fluid sample, wherein the pH of the fluid sample correlates to a hydroxide amount of the fluid sample; introducing an acid to convert all the inorganic carbon to carbon dioxide; applying a positive potential to the SP3 substituted carbon electrode; introducing, prior to or substantially simultaneously during the application of the positive potential to the SP3 substituted carbon electrode and in the reaction chamber, at least one acid reagent comprising a metallic catalyst that converts the carbonate and the partially oxidized species to carbon dioxide; determining total organic carbon by detecting an amount of carbon dioxide produced by the oxidation; determining the total organic carbon from the oxidation of the organic carbon species, and determining a derived alkalinity based upon the phosphate amount, the hydroxide amount, and the amount of carbon dioxide generated from the inorganic carbon.