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Extraction—spectrophotometric determination of benzethonium and benzalkonium salts with bomocresol green and quinine

✍ Scribed by Tadao Sakai

Publisher
Elsevier Science
Year
1983
Tongue
English
Weight
424 KB
Volume
147
Category
Article
ISSN
0003-2670

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✦ Synopsis

A method is described for the determination of benzethonium and benzalkonium compounds (l-5

X 10" M) based on the formation of ion-associates with bromocresol green (BCG) and quinine in 1,2-dichloroethane. Benzethonium and benzalkonium are extracted quantitatively after the formation of a new type of ion-associate with BCG and quinine in an aqueous solution at pH 8.2. The ion-associate shows an absorption maximum at 630 nm. Many other quaternary ammonium species and amines do not interfere. The method is applied to a range of pharmaceutical products.

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## Abstract A rapid extraction and spectrophotometric determination of palladium with N‐p‐chlorophenylbenzohydroxamic acid (N‐p‐Cl‐BHA) is described. The palladium forms an orange coloured complex with N‐p‐Cl‐BHA at pH 3.0. It is extracted with chlorobenzene and has a maximum absorbance at 430 nm.