Extractive Spectrophotometric determination of Cobalt (II) with p-Methylisonitroso acetophenonehydrazone

Abstract

A simple and rapid extractive spectrophotometic method for the

determination of Co(ll) is described. The complex formed between

Co(Il) and p-methylisonitrosoacetophenonehydrazone is extracted

into chloroform from aqueous solution of pH 7.5. The extracted

species has an absorption maximum at 520 nm and obeys Beer's

law over a range of 0.2-6  μg mL ^-1 of Co(II); the molar absorptivity

being 18.3 x 10³ L mole^-1 cm^-1. Interference from foreign ions has

also been studied.