【摘要】 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Fe3+、Fe2+、Pb2+、Cu2+、Hg2+、Ag+、S2-下,该显色体系可测定的下限为0.001 mg/L,在0.001~0.2 mg/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(Cu2+、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。更多还原

【Abstract】 The conditions for determining micro-cyanide in aqueous solution by isonicotinic acid-pyrazolone spectrophotometric was studied.The results showed that under co-existing the ions such as Fe³⁺,Fe²⁺,Pb²⁺,Cu²⁺,Hg²⁺,Ag⁺,S^2-etc.,the detection limit was 0.001 mg/L with the concentration range of 0.001⁰.2 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(Cu²⁺,Hg⁺ and Ag^-) had an effect on the determination for CN^-but also proved the determination conditions and areas with this color system.更多还原