公衆用水の水質に関する衛生化学的研究(V) : 亜硝酸性窒素共存下における硝酸性窒素の定量法の改良

概要

論文の詳細を見る
The factors for determining NO_3^--N in the presence of NO_2^--N were investigated. Two methods, i.e. the total value method reported by Yui and the aniline method, were taken up. The total value method was satisfactory, in which NO_3^--N was reduced to NO_2^--N in the presence of NO_2^--N as described by Lambert-Zitomer and as the result the value of the concentration of total NO_2^--N (the total value of NO_3^--N and NO_2^--N) was obtained, then the concentration of NO_3^--N was calculated by subtracting the value of the concentration of NO_2^--N in the sample solution from the value of the concentration of total NO_2^--N. Under the usual condition the second method, the aniline method, showed the considerable dispersion in the values of NO_3^--N obtained with the same sample solution. But the aniline method has been improved by the following modification of procedures. 1) On the diazotization of aniline, potasium bromide was added. 2) For the reduction of NO_3^--N to NO_2^--N, the condition reported by Lambert-Zitomer was used. 3) On coupling of aniline diazonium salt, α-naphthol was adopted as a coupling agent in the alkaline solution. (Received June 11,1964)
公益社団法人日本薬学会の論文
1965-03-30