Kinetic Analysis of Metal Ions Based on Differences in Their Fluorospecificity and Reactivity

在提出的研究项目下，进行了一些实验，取得了以下成果。用荧光计量法研究了锡(II)、锡(IV)与桑色素的络合反应动力学和热力学，建立了锡的差示分析方法。在选定的条件下，可选择性地测定高达1×10~(-5)M的锡(IV)，检出限为2×10~(-7)~(-7)M~2。研究了对映体与3-羟基-7-甲氧基黄酮、锡与桑色素的络合反应，设计了流动注射分析方法，建立了测定Sb(III)、Sb(V)、Sn2+、Sn4+的荧光分析条件。研究了Sb(III)-3-羟基-7-甲氧基黄酮络合物与铬(VI)的氧化反应，设计了一种灵敏的铬(VI)分析方法。在选定的条件下，可测定高达3.2×10~(-6)M的铬(VI)，检出限为2×10~(-7)~(-7)M。在测定2×10~(-7)~(-7)M的铬(VI)时，允许存在1400倍的铬(III)。本文研究了Zr(IV)、Hf(IV)与SXO的络合反应动力学，估算了这两种金属离子的伽马参数。在参数相同的情况下，提出了设计一种新的基于配体取代反应的分析方法的可能性。研究了汞(II)-PAR络合物与CDTA的配体取代反应动力学，设计了一种新的灵敏、选择性测定催化剂。在选定的条件下，在10000倍和25000倍(摩尔比)的硫酸盐存在下，亚硫酸盐和硫代硫酸盐的检出限分别为3×10；-8和2×10；-8-M，亚硫酸盐和硫代硫酸盐的检出限分别为3×10和25000倍。

Under the research projects proposed, some experiments were carried out and the following results were obtained.1. Kinetics and thermodynamincs for the complexation reaction of Sn (II) and Sn (IV) with morin have been studied fluorometrically to design a differential analysis of tins. Under the selected conditions, Sn (IV) up to 1*10^<-5> M could be selectively determined with a detection limit of 2*10^<-7> M.2. Comp lexation reactions of antiomy with 3-hydroxy-7-methoxyflavone and tin with morin have been studied to design flow-injection analysis of these metal ions, and conditions for the fluorometric determination of Sb (III), Sb (V), Sn (II), and Sn (IV) were established.3. Oxidation reaction of Sb (III)-3-hydroxy-7-methoxyflavone complex with Cr (VI) has been studied fluorometrically to design a sensitive analysis of Cr (VI). Under the selected conditions, Cr (VI) up to 3.2*10^<-6> M could be determined with a detection limit of 2*10^<-7> M.The presence of a 1400-fold amount (by molarity) of Cr (III) could be tolerated in the determination of 2*10^<-7> M of Cr (VI).4. Kinetics of the complexation reaction of Zr (IV) and Hf (IV) with SXO have been studied to estimate the gamma parameters for both metal ions. With the same parameter, some possibilities to design a new kinetic-catalytic method of analysis based on ligand-substitution reactions involving Zr (IV) were proposed.5. Kinetics of the ligand-substitution reaction of Hg (II)-PAR complex with CDTA have been studied to design a new sensitive and selective determination of a catalyst. Under the selected conditions, sulfite up to 1.5*10^<-6> M and thiosulfate up to 7*10^<-7> M could be determined with a detection limit of 3*10^<-8> M and 2*10^<-8> M in the presence of 10000-fold and 25000-fold amounts (by molarity) of sulfate, respectively.