Sulfur compounds included in fuel and lubricating oil have a negative influence on life time of after-treatment system to purify exhaust gas (sulfur poisoning phenomenon). In order to improve that, we have to strictly make clear reaction mechanism and it is important to measure SO2/Sulafate/H2S separately and continuously.
In addition, we need to decrease H2S generated during catalysis reaction, as irritating smell. CRDS doesn't need any specific chemicals and can measure the only H2S with stability.