Ultraviolet fluorescence sulfur method
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The sulfur content in naphtha is determined by the ultraviolet fluorescence sulfur method. In winter, the sulfur content is very high immediately after sampling; it drops significantly after being left indoors for a few minutes. What is the reason? The image shows a sampling bottle.
If the naphtha is a product of hydrogenation, then the sulfur present in it is mainly in the form of hydrogen sulfide. The sealing quality of your sampling bottle probably isn’t very good; since the sample was just taken and has just been exposed to the atmosphere, and given the low temperatures outside in winter, the hydrogen sulfide in the naphtha doesn’t dissipate into the air quickly. However, once you carry it to the laboratory, some of the hydrogen sulfide will escape over time. In the laboratory, as the temperature rises, the rate of dispersion increases, so the sulfur content will be lower by the time you conduct the measurement.