A new spectrophotometric method for the determination of some reducible compounds by the reduction with chromium(II) ion.

概要

論文の詳細を見る
A number of reducible compounds, such as nitrates, nitrites, nitro, nitroso, azoxy compounds, aldehydes, carbon tetrachloride, oximes, and chloramine T, can be determined by reducing them with chromium(II) ion prepared in an aqueous solution in a special vessel and measuring the absorbance of the resulting chromium(III) in the solution. In this reducing process, nitrate and nitrite are reduced to hydroxylamine quantitatively in hydrochloric acid at room temperature; carbon tetrachloride, nitrobenzene, and chloramine T each consume definite amounts of chromium(II) in an acidic medium at room temperature; propionaldehyde and azoxybenzene react with the reagent only in a basic solution; dimethylglyoxime and 1-nitroso-2-naphthol react only under heating at 80 °C in an basic medium. The absorbance of the resulting chromium(III) ion in the presence of the excess chromium(II) is found to obey Beer's law at the wavelengths of 410–425 nm over the range of 4×10−3–8×10−2 mol/l of chromium(III). This concentration range corresponds to about 10−5–10−4 mol of the reducible compounds mentioned above. A rapid and precise method has been established with few disadvantages.
公益社団法人日本化学会の論文