ASTM D6445 Test Method for Sulfur in Gasoline
ASTM D6445 Standard Test Method for Sulfur in Gasoline by Energy-Dispersive X-ray Fluorescence Spectrometry
3. Summary of Test Method
3.1 The sample is placed in the beam emitted from an X-ray source. The resultant excited characteristic X radiation is measured, and the accumulated count is compared with counts from previously prepared calibration standards to obtain the sulfur concentration in mg/kg. One group of calibration standards is required to span the concentration 5 to 1000 mg/kg sulfur.
4. Significance and Use
4.1 This test method provides a means of quantifying sulfur content in gasoline. It can be referenced in specification documents as a means to determine if the material meets the desired sulfur content. It is a rapid and precise measurement of total sulfur in petroleum products with a minimum of sample preparation.
4.2 The quality of gasoline is related to the amount of sulfur present. Knowledge of sulfur concentration is necessary for processing purposes. There are also regulations promulgated in federal, state, and local agencies that restrict the amount of sulfur present in gasoline as it affects performance characteristics and potential corrosion problems and emission levels. During combustion, the sulfur content in fuel affects SOx emissions, which degrade air quality. Certain jurisdictions may restrict the amount of sulfur in gasoline to prevent or limit pollution to the environment.
