树脂悬浮光度法测定地质样品中微量金

DETERMINATION OF TRACE GOLD IN GEOLOGICAL SAMPLES BY RESIN SUSPENSION SPECTROPHOTOMETRY

在pH4．7的HAc-NaAc缓冲液中，在表面活性剂吐温—80存在下，金与硫代米氏酮形成的配合物能被树脂富集并悬浮于甘油相中，用光度法测得该体系的最大吸收波长为551nm，方法灵敏度高，金在0～6μg／10ml范围内符合比尔定律．将树脂悬浮光度法应用于矿石中微量金的测定，结果较满意．

With the medium of HAc-NaAc (pH= 4. 7) in the presence of cationicsurfactant Tween-80, the complex formed by gold and TMK can be concentrated by resinand suspended in glycerol. The maximum absorption wavelength is at 551nm; the sensitivityis high and the Beer's law is obeyed in the range of 0～6μg of Au in 10mL of the solution.The method of resin suspension spectrophotometry is used to determine trace gold in ores.The results are satisfactory.