The fast and correct determination of total sulfur is an integral part of process and quality control in refineries. The most reliable method to do this is combustion of the sample followed by UV fluorescence detection of the produced SO2. Independent of the sulfur content, the majority of matrices can be analyzed with excellent results. But some of them give too high sulfur readings due to the presence of interfering components, such as nitrogen compounds. This effect is caused by a cross-sensitivity to NO, which fluoresces in the same wavelength range as SO2. Depending on the nitrogen content of the sample, this can lead to too high results of approx. 0.6 %–2 % of the TN content on the TS result.
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