Patent · US Active

Method of determining chemical oxygen demand (COD) for high chloride samples

US12235255B2 · kind B2 · utility

0Cited by

1References

8Claims

0Family size

Assignee

HACH LANGE GMBH · DE

Inventors

Isabel Hünig · Düsseldorf, DE
Carsten Schulz · Dormagen, DE
Helga Guthmann · Grevenbroich, DE
Ralf Kloos · Schwerte, DE

Key dates

Filing date	Jun 19, 2019
Grant date	Feb 25, 2025
Priority date	—
Expiry date	Jul 10, 2041

Classification

Technology area (CPC G)Physics
CPC primaryG01N21/31
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

The present invention provides a method of determining chemical oxygen demand (COD) for a sample with a high concentration of chloride. The method includes obtaining the sample, determining a concentration of chloride in the sample to obtain a known concentration of chloride in the sample, dosing an amount of the sample, an acid and an oxidizing agent into a container to obtain an analyte, heating the container containing the analyte, photometrically determining a preliminary chemical oxygen demand (COD) of the analyte in an analytic device, and correcting for the high concentration of chloride using a chloride correction to obtain the chemical oxygen demand (COD).

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.