Abstract
There are something impures contained in petroleum, metal compound make one of them. They are insoluble or melt as porphyrin complex in it, but they are small in quantity.
Compound of vanadium and nickel in petroleum has effect as catalyzer and cause of corrosion and wear of apparatus.
We measured vanadium and nickel contents of many crude oil and some kind of heavy fuel oil by absorptiometric analytical apparatus. Namely, analysis method of vanadium component take the JPI-5S-74T that use indicator of N-benzoyl-N-phenyl-hydroxylamine, and nickel component take the method of O.I. Milner's group that use indicator of di-methylglyoxime.
Beside those, as compared with the repetitional accuracy of each method and result of our method having different operation, these way produced results within acceptable JPI standard accuracy. And as an analysis of many crude oil, we could draw an interesting conclusion that vanadium/nickel ratio of crude oil was given by oil fields as the various numerical value.
