Super-high Sensitive Chromogenic Systems for Precious Metals Determination by Basic Dye Photometry

Basic dyes are the sensitive chromogenic agents for precious metals determination by photometry.This paper analyzed about 200 kinds of this super-high sensitive chromogenic systems(e106 L/mol·cm).Through contrasting research it has been found out that the keys to get super-high sensitive chromogenic systems are that create suitable conditions for forming a complicated ionic association precipitate through precious metal's comlex anion with dye cation,and try transferring the complicated precipitate and above-quota companying dye molecules to the solution equably so that they are suitable for next-step determination.