用不同浓度的氢氧化钾溶液和相同重量的风化煤,配制成不同浓度的腐植酸钾(KHm)溶液,并用72-1型分光光度计测定了它们的光密度用四苯硼钠法测出了KHm中的钾离子(K+)含量.研究结果得出,KHm溶液的光密度逐步增大到某一数值前,只与氢氧化钾溶液浓度有关,与K+含量无关.当达到或超过这个数值后,则K+含量与氢氧化钾浓度有关,但光密度与氢氧化钾浓度无关. With different concentrations of potassium hydroxide solution and the same weight of weathered coal, formulated into different concentrations of potassium humic acid (KHm) solution, and with a 72-1 spectrophotometer measured their optical density measured by sodium tetraphenylborate (K +) content in KHm.The results showed that the optical density of KHm solution gradually increased to a certain value, only with the concentration of potassium hydroxide solution, and has nothing to do with the K + content when it reaches or exceeds this value After, then K + content and the concentration of potassium hydroxide, but the optical density has nothing to do with the concentration of potassium hydroxide.