水銀(II)イオンのはん点分析(ノート)

概要

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A method of spot analysis for mercuric compounds has been proposed, by using a reaction of mercuric ion and hydroquinone to form a blue ring on a thin layer of kieselguhr (or filter paper). Five μl of the acidified (0.52N with respect to nitric acid) test solution is placed on a kieselguhr layer (Keiso layer G). After drying, about 5 μl of 3% aqueous solution of hydroquinone was spotted with a glass capilary tube. A light yellow stain was appeared when the spot was dried at 6070°C by hot air. Subsequently, about 5 μl of 1 N hydrochloric acidaceton (1: 1 v/v) was spotted. Then a blue ring appears if mercuric salt is present. This method was not interfered with the reaction of common metal ions. When carried out as a spot analysis on kieselguhr, the test is more sensitive than other layers and filter paper limit of identification on kieselguhr layer; 10 μg Hg/5 μl. Therefore, this reaction serves as a practical use for the detection of mercuric compound. In addition, it was proved that the effect of spot chromatographic separation is an important factor when this method was applied to the mixture.
社団法人日本分析化学会の論文