XRF Quantitative Analysis of Inorganic Elements in Oil with Different C/H Ratios and Oxygen Contents

<p>A new scattering X-ray correction method which can correct for the influence of immeasurable base elements in oil has been developed. This method can simultaneously correct for the influence of varying carbon to hydrogen ratio (C/H ratio) and oxygen content, as well as for the absorption by measurable inorganic elements in oil.</p><p>It was confirmed by theoretical calculations and experimental results that the influence of C/H ratio and oxygen content can be both accurately corrected for simultaneously by selecting a scattering X-ray with an appropriate wavelength as an internal standard line. It was also found that this method can prevent the appearance of the geometry effect, and the influence of sample thickness and density can be disregarded.</p><p>For samples such as lubricating and heavy oils which can contain high concentration levels of inorganic elements, absorption caused by the inorganic elements can be significant. Analysis errors caused by this effect can be corrected using correction coefficient alphas calculated by the fundamental parameter method.</p><p>Applying this new correction method has the advantage that the calibration curve can be easily generated using readily available standard oil samples. Regardless of sample type such as crude, shale or lubricating oils which can differ in C/H ratio and oxygen content, accurate quantitative analysis can be performed with a single universal calibration curve.</p>