EXPLANATION
This test method is valid for sulfur levels of 0.05 to 100 mg/kg in liquid aromatic hydrocarbons, their derivatives, and related chemicals. Virtually all sulfur compounds will be detected by this technique.
TEST SUMMARY
The sample is injected at a controlled rate into a stream of inert gas (helium or argon) or inert gas mixed with oxygen. The sample is vaporized and carried into a high temperature zone (>900°C) where oxygen is introduced. Sulfur compounds are converted to sulfur dioxide which is then reacted with the sensing electrode in a 3-electrode electrochemical cell. This reaction produces a measurable current that is directly proportional to the amount of sulfur in the original sample.
TEST PRECISION
Based on very limited data, the following precision estimates are reported:
