Abstract
Two methods suitable for benzaldehyde trace determination in benzyl alcohol have been developed, based on reversed-phase liquid chromatography (HPLC) and derivative UV spectroscopy. The HPLC method with UV-254 nm detection allowed simultaneous determination of benzyl alcohol and benzaldehyde and represents a convenient alternative procedure to the pharmacopoeial methods. Using a diode array detector the benzaldehyde peak identity and purity were easily confirmed. The described second-order derivative UV spectroscopic method was found highly suited to rapid benzaldehyde traces determination, but attention should be paid to possible interferences from substances (e.g. butylhydroxyanisole) absorbing over the 280–290 nm range. Both the proposed methods allowed a reliable determination of benzaldehyde at concentrations down to 0.05% of the benzyl alcohol level.
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