For petrochemical XRF calibrations, single-element organometallic standards of 5000 ppm can be used for the calibration of wear and trace elements. We can offer single-element standards from Conostan of all elements that are important in the petrochemical field, and this in concentrations of 1000 and 5000 ppm. As most of the Conostan standards are prepared starting from metal sulfonates, they also contain Sulfur as major element. For XRF-applications, the concentration of all elements is important, therefore we can provide you of the estimate sulfur content for all Conostan single element standards. For applications where sulfur free standards are required we can offer you 1000 and 5000 ppm standards from LGC.