US 11,808,733 B2
Square wave amperometry alkalinity measurement
Corey Alan Salzer, Fort Collins, CO (US)
Assigned to HACH COMPANY, Loveland, CO (US)
Filed by Hach Company, Loveland, CO (US)
Filed on Jan. 7, 2021, as Appl. No. 17/143,700.
Prior Publication US 2022/0214306 A1, Jul. 7, 2022
Int. Cl. G01N 27/416 (2006.01)
CPC G01N 27/4167 (2013.01) 9 Claims
OG exemplary drawing
 
1. A method for measuring an alkalinity of an aqueous sample, comprising:
introducing the aqueous sample to a voltammetric pH electrode;
holding a potential of the voltammetric pH electrode at a pH end point bias potential, wherein the pH end point bias potential corresponds to a titration pH end point;
applying a voltage step waveform comprising a plurality of potential pulses to the voltammetric pH electrode;
titrating the aqueous sample;
measuring one or a few current outputs resulting from the plurality of potential pulses, wherein the measuring comprises square wave amperometry; and
plotting a series current outputs from the voltage step waveform over a time span of the titrating to obtain a current maximum value.