摘要
In this research, the affect of storage time and different metals concentration of copper and iron on gum formation in gas oil is investigated. A study of the affect of gum content on properties of sample is performed, where the gas oil derived from （Kirkuk crude oil） have boiling point range （266-420）℃. For this purpose, a gas oil sample has been doped with these two metals ions at concentration levels of 0.5, 1.5, 2.5 and 3.5 μg mL-1. Washed gum content tests have been carried out using ASTM D-381 on samples stored for 8, 16, 24 and 32 days. The experimental results show that an increase in storage time and metal concentration strongly increases the rate of gum formation for all metal investigations and this increase in gum concentration affects the viscosity of samples towards increasing of viscosity.
