Analysis method for total sulfur in refined benzene
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May I ask what analysis methods are currently being used for the determination of total sulfur in pure benzene? Control 0.1PPM
With such a low content, ultraviolet fluorescence may be the appropriate method. The Coulomb method has reached its limit. Other methods can use chromatography with an FPD detector, but it is also very difficult to determine these concentrations accurately.
Chromatography with an SCD detector – I’m not sure what the results of this detection will be
For measuring 0.1PPM, the coulometric method is not accurate enough; the ultraviolet fluorescence method is more suitable. Using chromatography with an SCD detector also gives good results, though its performance is said to be rather unstable. The versions from Agilent are quite expensive.
FPD chromatography works as well, but 0.1 ppm may require use with an automatic sampler
Using a sulfur-chlorine analyzer, a precision of 0.1 ppm can be achieved.
It can be determined using the ultraviolet fluorescence sulfur method, but with such low concentrations, accuracy and repeatability are not very good.
TELDYNE has analyzers for measuring total sulfur using ultraviolet fluorescence, with a detection limit as low as the PPB level
The 8# XUTEMP can be used with the WDL-94 micro-sulfur analyzer from the Southwest Chemical Engineering Research and Design Institute; it is capable of detecting levels as low as 0.1 ppm. http://www.wdl-94.com. It is an intelligent, dedicated analyzer
Is it laboratory testing or online analysis? For laboratory analysis, accuracy can still be achieved using a chromatography FPD detector + automatic sampler. If it is online analysis, chromatography may not provide accurate results. Therefore, the adsorption of trace amounts of H2S in stainless steel pipelines is also a significant issue; if the ultraviolet fluorescence method is used, PVC or PFA pipelines can be employed for the transmission lines.