分光光度法测定油井岩芯的吸蓝量

介绍一种确定吸蓝反应终点的新方法。与通常采用的晕环法相比，该方法具有更高的准确性。与普通的分光光度法相比，该方法的优点是不需要用标准蒙脱石样品作标准曲线。根据所建立的方法测定蒙脱石的质量分数时，可以减小由于样品的不均匀性而产生的误差。对于某一油井岩芯样品，经过６ 次平行测定，蒙脱石质量分数的平均值为１５ ．１ ％ ，相对标准偏差为０ ．１ ％ 。

SPECTROPHOTOMETRIC DETERMINATION OF METHYLENE BLUE ADSORBED BY OIL WELL CORE

A new method has been developed for determining the end point of adsorption reaction for methylene blue.The accuracy is higher than halo method,which is generally used .In comparison with general spectrophotometric method,the advantage of this method is that no standard sample is needed for standard curve.The error from inhomogeneity of samples can be reduced.According to the measuring results for a oil-well core sample,the average content of montmorillonite is 15.1%,the relative standard deviation is 0.1 %.