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本文讨论了邻菲啰啉银试剂用作沉淀和测定VO_3~-离子,在PH6—8,沉淀完全。形成的三元络合物沉淀组成比为Phen:Ag~+:VO_3~-=2:1:1。V~(+4)不具有上述反应。将沉淀离心分离后,采用亚铁离子测定澄清液中剩余的phen,从而达到有V~(+4)存在下测定V~(+5)的目的。VO_3~-离子浓度在0.24—1.74毫克/10毫升范围。符合Beer定律。回收实验误差为±4.5％。当有V~(+4)存在下与V~(+5)的浓度比为V~(+4):V~(+5)=1:10时,误差为±5.4％。
This article discusses the use of orthophenanthroline reagents for the precipitation and determination of VO_3 ~ - ions at pH 6-8, complete precipitation. The formed ternary complex precipitate composition ratio Phen: Ag ~ +: VO_3 ~ - = 2: 1: 1. V ~ (+4) does not have the above reaction. After the precipitate was centrifuged, the remaining phen in the clarified solution was measured by ferrous ion so as to achieve the purpose of measuring V ~ (+5) in the presence of V ~ (+4). VO_3 ~ - ion concentration in the range of 0.24-1.74 mg / 10 ml. Beer’s law is in line. Recovery experimental error of ± 4.5%. The error was ± 5.4% when V ~ (+4): V ~ (+5) = 1: 10 with V ~ (+4) in the presence of V ~ (+5)