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本文建立了应用藏红T作显色剂分光光度法测定微量金的新方法。金(Ⅲ)在硫酸介质中及溴化钠存在下与藏红T反应形成红色络合物。此络合物易被非水溶剂如:环己烷+丁酮(3+2)、苯+丁酮(7+8)环己烷+MIBK(3+2)、乙酸异戊酯、乙酸丁酯或乙酸正戊酯所萃取,最大吸收在528—530nm之间(表观摩尔吸光系数e=5.70×10~4—7.25 x10~4l·mol~(-1)·cm~(-1))。分别在0—22、5、0—30、0—30、0—35、0一35、0一30微克金/10毫升遵守比尔定律。本法已应用于矿石中微量金的分析。
In this paper, a new method for the determination of trace gold by the spectrophotometric method of safranin T was established. Gold (III) reacts with safranin T in the presence of sulfuric acid and sodium bromide to form a red complex. The complex is easily contaminated with nonaqueous solvents such as cyclohexane + butanone (3 + 2), benzene + butanone (7 + 8) cyclohexane + MIBK (3 + 2), isoamyl acetate, Ester or n-pentyl acetate extraction, the maximum absorption between 528-530nm (apparent molar absorptivity e = 5.70 × 10 ~ 4-7.25 x10 ~ 4l · mol -1 cm -1) . Beer’s law is obeyed at 0-22, 5, 0-30, 0-30, 0-35, 0-35, 0- 30 micrograms gold / 10 ml respectively. This method has been applied to the analysis of trace gold in ores.