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介绍了一种用双波长分光光度法测定稠油中沥青质含量的改进法。即通过测定样品悬浊液在７５０ｎｍ和８００ｎｍ波长入射光作用下的吸光度来计算正庚烷沥青质的含量，给出了公式推导方法，讨论了取样量、配制样品液的温度、放置时间和甲苯含量对样品溶液吸光度的影响，选择了最佳试验条件。此法具有工序少，耗时短，准确度高的特点。可用于炼厂过程控制中各种渣油的分析，也可用于稠油开采、集输方案的优选。
An improved method for determination of asphaltene content in heavy oil by dual wavelength spectrophotometry is introduced. That is, the content of asphaltene in n-heptane was calculated by measuring the absorbance of the sample suspension under the incident light at the wavelength of 750nm and 800nm. The formula was derived, and the sampling volume, the temperature of the prepared sample solution, the storage time and toluene Content of the sample solution absorbance, select the best test conditions. This method has fewer processes, time-consuming, high accuracy. It can be used in the analysis of all kinds of residual oil in refinery process control, and also can be used for the optimization of heavy oil recovery and gathering and transportation schemes.