REAGENT FOR GOLD CONCENTRATION AND GOLD-CONCENTRATION TESTING PAPER AND GOLD CONCENTRATION MEASURING METHOD USING SAID REAGENT

摘要

PURPOSE:To simplify an apparatus and to decrease a cost, by making pyridinium bromide perbromide (PBP) react with dicyanogold complex, and performing colorimetric analysis of the reaction product. CONSTITUTION:When dicyanogold potassium (A) is made to react with PBP (B), reaction products (C) and (D) are formed as shown by the formula. Since the gold potassium (A) and the product (D) are colorless and transparent, the change in colors in the formula occurs only in the order of PBP (B) (orange color) product (C). The color of the product (C) is light lemon in correspondence with the concentration of existing gold. When the colorimetric analysis of the degree of the lemon color of the product (C) is performed, the concentration of the gold can be measured. For example, a piece of gold concentration test paper which is impregnated with the PBP is dipped in aqueous solution incorporating dicyanogold complex. The discolored color of the test paper is visually compared with sample colors which are otherwise prepared for the concentrations of the gold, and the concentration of the gold can be found.