This study employed turbidimetric method using a UV/VIS spectrophotometer to determine the total
sulfur levels of refined petroleum products in Southwestern Nigeria. The sulfur concentrations in the analyzed fuel samples were 0.0019–0.0178 wt% and 0.027–0.169 wt% for gasoline and diesel, respectively.
Sulfur levels in the selected samples were below the Nigerian standard for gasoline and diesel while
89.9% of the samples exceeded the U.S. Environmental Protection Agency standard. The turbidimetric
method showed better performance than the gravimetric method. The results gave insight into the adverse
environmental impact the nonuniform quality of fuels imported could pose to the country