Abstract
The biacetyl mono(2-pyridyl)hydrazone (BPH) spectrophotometric procedure for zinc (λ max = 440 nm, ϵ = 52,100 liters mol −1 cm −1, 1 ml BPH at 0.25% in ethanol/25 ml, 20% of ethanol as medium, boric acid/sodium hydroxide, pH 10, buffer) has been applied to the determination of zinc in pharmaceutical preparations (ophthalmic solutions, mouthwash liquids, and cream ointments) with good results.
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