Patent · US Active

Method for producing a purple complex for the presence of lead using sodium rhodizonate without use of strong acid

US11442049B2 · kind B2 · utility

0Cited by

2References

21Claims

0Family size

Inventors

Frederic G Dewalt · Landenberg, US
David Cox · London, GB

Key dates

Filing date	Jul 25, 2019
Grant date	Sep 13, 2022
Priority date	—
Expiry date	Oct 7, 2040

Classification

Technology area (CPC G)Physics
CPC primaryG01N21/78
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

A method using ascorbic acid (Vitamin C) as part of a chemical test kit employing sodium rhodizonate as the coloring agent for producing a yellow-orange to purple color transition for detection of lead in various media eliminating the use of strong acid.

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