Determination of trace metal elements in crude oils and the changes of trace metal elements of the weathered oils

A method was studied for the analysis of V、Cr、Mn、Fe、Ni、Zn、Mo、Ba etc in different crude oils and weathered oils by ICP-MS after these samples were digested with microwave digestion.The results showed that the detection limit of the method was in the range of 0.0056～0.8729 μg/g depending on eleven different elements.And the linear correlation coefficient was preferable,equaling to or more than 0.9995;the relative standard deviation was less than 5.0%.The distribution patterns of the trace metal elements in crude oils had great change after 30 days weathering;Among the selected elements,Ni、V had strong weathering-resistant capabilities and Ni/V ratio remained relatively stable.