活性炭柱富集-化学光谱法测定痕量金具有灵敏、快速、简便等优点,被广泛用于化探样品中痕量金的测定。除该法外,其它一些测定痕量金的方法(如原子吸收法等)也采用活性炭柱来富集样品中的金。我们在工作中发现,地质样品在王水溶矿后,常遇到有些样品溶液中有胶体生成(特别是含碳酸盐样品)。由于胶体会堵塞滤纸孔,给抽滤带来困难。若通过增大抽力或延长抽滤时间过滤,不但费时费力,还因部分胶体透过滤纸进入活性炭柱,使活性炭柱不好洗涤,杂质不易洗去,灰化后摄谱相板背景很深,分析结果的准确性受到影响,有时甚至无法测量。针对这个问题,我们采用在抽滤前向样品溶液中滴加数滴1%聚氧乙烯溶液,并充分搅拌,使胶体絮凝,这样就很容易 Activated carbon column enrichment - Determination of trace amounts of gold by chemical spectrometry has the advantages of sensitivity, rapidity, simplicity, etc., and is widely used in the determination of trace gold in geochemical samples. In addition to the law, other methods for the determination of trace amounts of gold (such as atomic absorption, etc.) also use activated carbon columns to enrich the gold in the sample. In our work, we found that geological samples often encounter colloids (especially carbonate-containing samples) in some sample solutions after being dissolved in aqua regia. Due to the colloid will clog the filter paper hole, to suction filtration difficulties. If by increasing the pumping force or prolongation of filtration time filtration, not only time-consuming and laborious, but also because part of the colloid through the filter paper into the activated carbon column, the activated carbon column is not good washing, impurity is not easy to wash away, ashing plate phase deep background , The accuracy of the analysis results is affected, and sometimes can not be measured. In response to this problem, we use a few drops of 1% polyoxyethylene solution in the sample solution before the suction filtration, and stir, so colloidal flocculation, so it is easy