By J. S. Fruchter, C. L. Wilkerson, J. C. Evans, R. W. Sanders (auth.), Royston H. Filby, B. Stephen Carpenter, Richard C. Ragaini (eds.)
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Better than 20% comparisons were obtained for Cd, Cr, Mo and Ti. Systematic differences of about 15-20% between x-ray fluorescence and neutron activation determinations of arsenic were noted, with the neutron activation being generally higher. The environmentally interesting elements B, Hg, and Se could be reliably determined by only one method, so intercomparisons could not be made. Fluorine could not be reliably determined by any technique (selective ion electrode, colorimetry) that we tried.
A mechanism of mercury reduction to the elemental state in which the solvent ~layed an important role was proposed (25). ~odern analytical lI)ethods have extended the determination limits for certain elements to a point that the sensitivity of an analytical technique is greatly limited by the analytical blank value. ,ppm levels. Standards Standards are used both for recovery or yield corrections and for quantitation. Standard reference samples for multiple trace metals in petroleum are rather scarce, and thus any attempt for cross-checking or technique evaluation may be limited.
The authors also found that there was an almost linear relationship between the Ni and V contents for all Cretaceous oils, including the MCMurray bitumens, thus providing evidence for a similar mode of origin for these oils. , (7), and Bowman (8), have analyzed oil sand solids for several elements and the latter author has also reported Ni and V contents in the bitumens. Hitchon, Filby and Shah (9) have reported data on 22 elements in 88 Alberta crude oils, including two MCMurray Formation bitumens from the SYNCRUDEmining operation.