2.5.8 Determination of primary aromatic amino-nitrogen
芳伯氨基氮的测定
Dissolve the prescribed quantity of the substance to be examined in 50 ml of dilute hydrochloric acid R or in another prescribed solvent and add 3 g of potassium bromide R. Cool in ice-water and titrate by slowly adding 0.1 M sodium nitrite with constant stirring.
Determine the end-point electrometrically or by the use of the prescribed indicator.
原文由 poorlittle(poorlittle) 发表: If hydrochloric acid R is different from hydrochloric acid, it should be translated precisely. Similar to potassium bromide R..
嗯，这样翻译是欠妥了，欧洲药典中关于稀盐酸有以下几种：
Hydrochloric acid, dilute. 1043503.
Contains 73 g/l of HCl.
Dilute 20 g of hydrochloric acid R to 100 ml with water R.
Hydrochloric acid, dilute R1. 1043504.
Contains 0.37 g/l of HCl.
Dilute 1.0 ml of dilute hydrochloric acid R to 200.0 ml with water R.
Hydrochloric acid, dilute R2. 1043505.
Dilute 30 ml of 1 M hydrochloric acid to 1000 ml with water R; adjust to pH 1.6 ± 0.1. 这样看来这里的hydrochloric acid R应该是指第一种了
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