DIRECT COMPLEXOMETRIC TITRATION OF GALLIUM IN THE PRESENCE OF 7-(1- NAPHTHYLAZO)-8-HYDROXYQUINOLINE-5-SULPHONIC ACID AS AN INDICATOR

Journal Article · Thu Mar 01 04:00:00 EST 1962 · Zhur. Anal. Khim.

OSTI ID:4830634

Busev, A I; Talipova, L L; Skrebkova, L M

The interaction of gallium ions with 7-(1-naphthylazo)-8hydroxyquinoline- 5-sulfonic acid was studied. It was found that gallium reacts with 7-(1- naphthylazo)-8-hydl oxyquinoline-5-sulfonic acid in a molar ratio 1: 1, the molar extinction coefficient of the compound formed is 1.56 x 10/sup 4/, and the equilibrium constant of the reaction studied is 0.96 x 10/sup 2/. It is shown that 7-(1-naphthylazo)-8-hydroxyquinoline5-sulfonic acid may be used as indicator in the direct titration of gallium ions with complexone III at pH 2.2 and higher. Calcium, magnesium, manganese, cadmium, and zinc ions do not interfere with the complexometric determination of gallium, as well as aluminum ions in the presence of fluorine ions. A method for the synthesis of 7-(1naphthylazo)-8- hydroxyquinoline-5-suifonic acid is spectfied. (auth)

• Research Organization: Moscow State Univ.
• NSA Number: NSA-16-018837
• OSTI ID: 4830634
• Journal Information: Zhur. Anal. Khim., Journal Name: Zhur. Anal. Khim. Vol. Vol: 17
• Country of Publication: Country unknown/Code not available
• Language: Russian

Related Subjects

ACIDITY
CHEMISTRY
DYES
EDTA
GALLIUM
GALLIUM COMPLEXES
ORGANIC SULFUR COMPOUNDS
PREPARATION
QUALITATIVE ANALYSIS
SULFONIC ACIDS
TITRATION