インドフェノール改良法による海水中微量アンモニアの直接定量

概要

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It has been well known that the formation of precipitation makes impossible the color-imetric analyses1-9) of ammonia-N in sea water, when Nesslerization was applied without any pretreatment. Among other modifications10-25) in which Nesslerization is not employed, the LUBOCHINSKYs indophenol method25) looks better. Because it has such an advantage as to enable the colorimetric analysis of ammonia even when precipitate may be produced: the developed color is so stable for considerably long time that the precipitate can be settled naturally or removed centrifugally. However, it is difficult to perform this analysis in short time by the LUBOCHINSKYs original method, because of the troublesome treatment of precipitate formed and the delay of color development. The author, thus, attempted to prevent the formation of precipitate by adding EDTA and to accelerate the color development by heating the reaction mixture. The modification enables us accurate analysis of ammonia in sample sea water and also polluted sea water.
公益社団法人日本水産学会の論文