Pyridine-2-carbaldehyde 2-hydroxybenzoylhydrazone reacts with iron(II) to produce a green 2:1 complex (λmax. = 620 nm, Iµ= 3.64 × 103 l mol–1 cm–1 in aqueous ethanolic solution, and λmax. = 640 nm, Iµ= 3.67 × 103 l mol–1 cm–1 in chloroform). The green complex, extracted into chloroform, has been used for the spectrophotometric determination of trace amounts of iron. The method has a high selectivity and has been applied to the determination of iron in different samples, such as industrial waste water, non-ferrous materials and minerals.

Pyridine-2-carbaldehyde 2-hydroxybenzoylhydrazone effectively extracts and spectrophotometrically determines trace amounts of iron in various samples, with high selectivity.

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Pyridine-2-carbaldehyde 2-hydroxybenzoylhydrazone as a selective reagent for the extraction and spectrophotometric determination of iron(II)

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