稀标准溶液的浓度一般很容易发生变化,其原因,有容器壁的吸附和器壁上杂质的溶出,以及因为水解等化学变化生成胶状沉淀、分解和向大气中挥发等等。关于吸附到容器壁上和从壁上溶出杂质的研究较多;有黑羽对塑料容器除去杂质的研究,卡林等人用硝酸洗涤聚乙烯容器以溶出微量杂质的研究,格林等人对硅硼玻璃试剂瓶中硼溶出量的测定等。尽管硝酸的稳定性较差,可是氮的氧化物分析常常需要硝酸,而其稀溶液的稳定性尚未进行研究。本文就 The concentration of dilute standard solution is generally very easy to change, because of the container wall adsorption and dissolution of impurities on the wall, and because of chemical changes such as hydrolysis to produce gelatinous precipitate, decomposition and volatilization to the atmosphere and so on. On the adsorption to the wall of the container and the dissolution of impurities from the wall more; with black plugs on plastic containers to remove impurities, Carlin and others with nitric acid to clean polyethylene containers to extract trace impurities, Green et al on silicon Boron glass reagent bottle boron dissolution determination. Despite the poor stability of nitric acid, nitric acid is often required for the analysis of nitrogen oxides, and the stability of dilute solutions has not been studied. This article is