Patent · US Expired

Method of electrically measuring the concentration of acids

US4988418A · kind A · utility

6Cited by

2References

20Claims

0Family size

Assignee

Hagen Batterie AG · DE

Inventors

Fritz Beck · Duisburg, DE
Holger Krohn · Lohr am Main, DE
Rainer Wagner · Martinsheim, DE
Eberhard Nann · Soest, DE

Key dates

Filing date	Mar 14, 1989
Grant date	Jan 29, 1991
Priority date	—
Expiry date	Mar 14, 2009

Classification

Technology area (CPC G)Physics
CPC primaryG01N27/416
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

In a method for the electrical measurement of the concentration of acids a measurement electrode (11) consisting at least predominantly of crystalline graphite is arranged in an acid (12) having anions which form graphite intercalation compounds with graphite. The measurement electrode (11) is then intercalated by generating in the measurement electrode (11), at a variable positive potential, a current of such a size that the anions of the acids (12) can from graphite intercalation compounds with the graphite. The current is maintained until the intercalation compounds have formed at the surface. The potential at the measurement electrode (11) is then measured and used as a measure for the acid concentration. The measurement electrode (11) is subsequently deintercalated again.

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