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岩石中分散有机质的丰度,是评价生油岩的重要指标之一。本文应用非水滴定法测定生油岩中的有机碳,该方法体系稳定、快速准确、灵敏度高,适合于测定0.01-2％有机碳含量的样品。 岩样经磷酸处理,除去碳酸盐,在硫酸介质中以钒酸铵为催化剂、氧化铬为氧化剂,将有机物氧化成二氧化碳,用乙二醇、乙醇、丙酮、氢氧化钾等混合液作吸收剂兼滴定液,以百里酚酞和百里酚兰作指示剂,滴定终点明显。
The abundance of dispersed organic matter in rocks is one of the important indexes for evaluating the source rock. In this paper, non-aqueous titration method for the determination of organic carbon in source rocks, the method is stable, fast and accurate, high sensitivity, suitable for the determination of 0.01-2% organic carbon content of the sample. The rock samples are treated with phosphoric acid to remove carbonates, ammonium vanadate is used as a catalyst in the sulfuric acid medium, and chromic oxide is used as an oxidant to oxidize organic substances into carbon dioxide, which is absorbed by a mixture of ethylene glycol, ethanol, acetone and potassium hydroxide Agents and titration to Thymolphthalein and Thymol blue as indicators, titration end point significantly.