Successive Determination Of Ag,Au,Ru In Geological Samples By Oscillopolarography Catalytic Wave After Separation And Enrichment By Congo Red Forming Resin

With the development of modern technology and the knowledge of noble metals deepening, the function of noble metals as"Vitamin of the modern industry becomes greater and greater. However, the amount of noble metals is a little, the mass percent is about 10-8~10-9. For the lack of resource but contravention of demands, to explore noble metals in mineral is an emphasis of geology, especially in the latest geological investigation, noble metal became an important investigation objects. So as an analyst, to offer a rapid,smart and powerful detected analytical method is the urgent affairs. Thus, it is important to investigate a rapid,sensitive and successive determination method for multi noble metal.Before ICP-MS being widespread, electrochemistry method had definite advantages in analyzing noble metal, in general analysis the quantity of sample is large, analytical task is heavy, requiring high sensitivity and rapid analysis. While electrochemistry method could satisfy. Its instrument is simple, determination rapid, a small amount of sample is needed etc. Especially polarographic catalytic wave analysis has extensive application range,simply,quickly with high sensitivity and veracity in successive determination noble metals.The purpose of this paper is to quest for a new polarographic catalytic method which can successively determinate noble metals rapidly,exactly,simply with a high sensitivity. It mainly studied successive determination of Ag,Au,Ru in geological samples by oscillopolarography. Furthermore, studied the best determination conditions of sample systems and instrument. An optimal analytical flow of successive determination of Ag,Au,Ru in the same that solution.The effects of different component of base solution,temperature,the height of Hg,Eb,the scan rate,the immobility time,the stabilization time were tested. Studied the reaction mechanism.The instrument parameters were optimized. The optimum instrument conditions were:Au: Eb=-370mv; the scan rate 500 mv/s; the immobility time 6s; the height of Hg 40cm;the stabilization time 3-24h.Ru: Eb=-750mv; the scan rate 500 mv/s; the immobility time 6s; the height of Hg 40cm; the stabilization time 10-30min.