塩誤差を伴わない水中微量アンモニアの直接定量法
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概要
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A direct colorimetric method has been developed for the determination of ammonia in water without salt-error by using the phenol-hypochlorite reaction. As a large amount of potassium carbonate was added to make the condition of indophenol blue formation nearly constant without regard of the salinity of samples, the method could be made free of salt-error in the determination of samples of either fresh or sea water whose chlorinity was less than 28%. BEERS law was applicable up to a concentration of 0.6 ppm NH3-N, and the standard deviation of each determination was about 2.2 ppb N irrespective of the concentration. The amount of reagents and the conditions of the procedure were examined in detail. Twenty-five inorganic and thirty-eight organic compounds, including twenty-one L-amino acids, were tested for interference, and little interference was observed in the not strongly polluted samples.
- 公益社団法人 日本水産学会の論文