Apparatus for Vicinal Diketone Analysis According to the Improved Micro Method. Takashi Inoue, Research Laboratories, Kirin Brewery Co., Ltd., Takasaki, Gumma Pref., Japan 370-12. J. Am. Soc. Brew. Chem. 38:008, 1980.

Four kinds of apparatus for vicinal diketone determination by the improved micro method were developed in our laboratory. Procedures for renewing sample beers and distillate collectors in the multiple gas-stripping apparatus sets connected in series were simplified by the introduction of a ball joint connector between the generator and the water-cooled condenser and by a screw cap connector for the trap. A space-saving model was developed by arranging the gas-stripping apparatus sets around a rotating table. In this apparatus, a rotating connector prevented twisting of the tubes used for stripping-gas supply, cooling-water supply, and discharge. To permit sample charges to be made without removing the generator from its mount, a sample charge and discharge system was constructed, using a three-way stopcock, a sample dosimeter with a removable cap, a multi-way valve, and additional three-way stopcocks leading to the generators. The gas-stripping apparatus was then automated by automating these valves. Finally, an automatic color development unit was devised by connecting the required number of reaction units in a series in which the flow mechanism of the gas and the reaction mixture was the same as that in the sample charge and discharge system.

Keywords: Analyzer, Apparatus, Colorimetry, Distillation, Vicinal diketones