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編輯同志: 药品分析中常用的M/10亚硝酸鈉标准液不太稳定,特別是亚硝酸鈉质量較差时(如显淡黄色或有硝酸臭味时),配好的标准液其浓度随时問有显著的下降(見表1)。为了克服这个問題,我們試驗寻找了适当的稳定剂。經过多次試驗得出,在每1000毫升M/10亚硝酸鈉标准液中加入碳酸鈉(Na_2CO_3·10H_2O)0.1克,则溶液浓度在三个月內无大的变化(見表2)。
Edit comrades: M / 10 sodium nitrite standard solution commonly used in drug analysis is not stable, especially when the quality of sodium nitrite is poor (such as light yellow or nitric acid odor), with a good standard concentration of the solution at any time There is a significant decline (see Table 1). In order to overcome this problem, we experimented to find suitable stabilizers. After several experiments, we found that adding 0.1 g of sodium carbonate (Na 2 CO 3 · 10H 2 O) to 1000 ml of M / 10 sodium nitrite standard solution did not change greatly within three months (Table 2).