4.0 Conclusion
This study faced some challenges during the measurement, one of the main difficulties caused by GC column which was blocked after each run. Therefore, another alternative method for the analysis of TPH in contaminated soil was required to be developed. The mixtures of (acetone: hexane v/v) in mixed solvent were effective in extracting weathered oil from contaminated soils. This experiment has shown that the interaction between the extraction solvent and oil contaminants was unlikely to be changed by increasing the weight of the soil sample or the contact time. The developed gravimetrical method used more solvent with less time, so that three samples could be extracted in one hour.