試薬中の微量アンモニウムの分光光度定量法 : JIS分析法の迅速化に関する研究
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概要
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The purpose of these serial studies is to find both the rapid microdetermination of total impurities in commercial reagents and the rapid method for grading the reagents according to the JIS (Japanese Industrial Standard). Microquantities of metallic impurities in the reagents were simultaneously determined by means of an emission spectroscopic analysis. Although the main object of these studies has been almost accomplished, ammonium ion and many anions in the reagents has not yet been determined by the above-mentioned method only, since this method is not precise enough for the microdetermination of the ions. Therefore, the microdetermination of ammonium ion in the reagents was investigated by a spectrophotometric method instead of the emission spectroscopic analysis. There are many methods for the microdetermination of ammonium ion, and the authors are planning a simultaneous determination of many coexistent impurities. In the present paper we have adopted the color reaction of ammonium ion with phenol and sodium hypochlorite for the spectrophotometric determination of ammonium ion in the reagents, since this reaction is not disturbed by other substances. In this case, the selection of wave length in the spectrophotometry, the ratio of the two reagents, temperature, pH, the time of the reaction, the influences of foreign ions, etc. were investigated in detail. On the practical measurements, it was confirmed that the influence of pH is the greatest of those ones; therefore pH must be kept at 8.9-9.2. The maximum allowable quantities of ammonium ion in the commercial reagents of each grade are prescribed in the JIS respectively. We have established a method using a wave length of 626μm, by means of which the quantity of ammonium ion can be easily determined. Moreover, in this method the presence of chromate ion does not interfere with the determination of ammonium ion.
- 山形大学の論文
- 1960-03-30
著者
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