This method is for determining sulfur in liquid hydrocarbons at concentrations ranging from 10 to 1500 ng/g (mass-ppb). A direct measurement procedure (Part A) is used for samples above 100 ng/g. A trap 38; release procedure (Part B) is used for samples between 10 and 200 ng/g where high precision is required. This method is also applicable to highly volatile samples, such as pentane, through the use of a cooled sampling system.
Higher concentrations can be determined by ASTM Method D5453, 34;Standard Test Method for Determination of Total Sulfur in Light Hydrocarbons, Spark Ignition Engine Fuel, Diesel Engine Fuel, and Engine Oil by Ultraviolet Fluorescence34; and D7183, 34;Standard Test Method for Determination of Total Sulfur in Aromatic Hydrocarbons and Related Chemicals by Ultraviolet Fluorescence34; using the cooled sampling system described herein for highly volatile matrices.
Halogens interfere at concentrations greather than approximately 0.337;. The method has reduced sensitivity to sulfur present as a sulfate. For Part A, nitrogen content must not exceed sulfur by more than 100-fold to prevent a positive bias to the results.
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