An Impreved analytical method for, the determination of asphaltene content in crude oils and petroleum products wag developed. This method uses an on-column precipitation. and redissolution technique coupled with all evaporative light scattering detector (ELSD). Among the improvements is a quantification. of the asphaltene content using a calibration procedure, and the redissolution agent is replaced with it blend with a better solvent power. The method requires a small amount of sample. it takes only 20 mill to perform and call quantify asphaltene contents as low as 120 ppm with a relatively low error. It can be automated, and it also has the potential to be used on line. It has better repeatability and reproducibility than the traditional gravimetric method, which are the actual standards. This work also includes results from preparative experiments that support the reliability of the described methodology. All of these, characteristics make this on-column method a good candidate for the monitoring of processes in the oil industry.