废水中总氰化物含量测定条件的研究

Study of the determination conditions of total cyanide in waste water

对异烟酸-吡唑啉酮（isonicotinic acid—pyrazolone）显色体系测定水溶液中微量氰化物（CN^-）条件进行了实验考察。结果表明，在有多种共存金属离子如Fe^3＋、Fe^2＋、Pb^2＋、Cu^2＋、Hg^2＋、Ag^＋、S^2-下，该显色体系可测定的下限为0．001mg／L，在0．001～0．2mg／L范围内符合比尔定律。实验重点考察了溶液中共存金属离子对测定干扰的影响，表明软酸离子（Cu^2＋、Hg^＋和Ag^-）对测定有影响，证实了该体系测定CN^-的应用条件和范围。

The conditions for determining micro-cyanide in aqueous solution by isonicotinic acidpyrazolone spectrophotometric was studied. The results showed that under co-existing the ions such as Fe^3＋ , Fe^2＋ , Pb^2＋ , Cu^2＋ , Hg^2＋ , Ag ^＋ , S^2- etc. , the detection limit was 0.001 mg/L with the concentration raiage of 0.001 -0.2 mg/L for CN^- which accorded with Beer＇s Law. In the assay, the interference which resulted from coexistent metallic ions was mainly discussed. The conclusion not only indicated that soft acid ions （Cu^2＋ ,Hg^＋ and Ag^- ） had an effect on the determination for CN^- but also proved the determination conditions and areas with this color system.