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Bis(O, O′-dipropyl dithiophosphato)nickel(II) is soluble in ethanol and absorbs light at 524nm (molar absorptivity, e, is 91mol-1 dm3 cm-1) and 688nm (e is 74mol-1 dm3 cm-1). In water-ethanol mixed solvents, however, part of the complex dissociates into nickel(II) and O, O′-dipropyl dithiophosphate ions, and the absorbances at 524 and 688nm depend on the water content. This property of the complex can be utilized for the spectrophotometric determination of the alcohol content of alcoholic drinks. The method proposed is as follows: 6cm3 of sample drink cooled to 15°C and 14cm3 of a 14.3mmol/dm3 ethanolic solution (its temperature being adjusted to 25°C) of a nickel(II) complex are mixed. After the mixture is warmed to 25°C, the absorbance is measured at 524 or 688nm. The alcohol content is calculated by using calibration graphs. This method is simple, rapid, accurate and suitable for the analysis of shochu, whisky, brandy and vodka. This method is also applicable to the analysis of sake, wine and beer, provided that a distillation step as a pretreatment is introduced into its procedure.

Spectrophotometric Determination of the Alcohol Content of Alcoholic Drinks with Bis(O, O’-dipropyl dithiophosphato)nickel(II)