ASTM International - ASTM D6021-06
Standard Test Method for Measurement of Total Hydrogen Sulfide in Residual Fuels by Multiple Headspace Extraction and Sulfur Specific Detection
|Publication Date:||1 August 2006|
|ICS Code (Liquid and solid fuel burners):||27.060.10|
significance And Use:
Excessive levels of hydrogen sulfide in the vapor phase above residual fuel oils in storage tanks may result in health hazard, OSHA limits violation, and public complaint. An additional concern is... View More
Excessive levels of hydrogen sulfide in the vapor phase above residual fuel oils in storage tanks may result in health hazard, OSHA limits violation, and public complaint. An additional concern is corrosion that can be caused by the presence of H2S during refining and other production activities. Control measures to maintain safe levels of H2S require a consistent method for the assessment of potentially hazardous levels of H2S in fuel oils. (Warning-H2S is a highly toxic substance. Extreme care must be used in the sampling and handling of samples that are suspected of containing high levels of H2S.)
A concentration of 0.1 μg/g (ppmw) of H2S in the liquid phase of a No. 4, 5, or 6 residual fuel oil can generate an actual gas concentration of 10 to 100 μL/L (ppmv) of H2S in the vapor phase; therefore an accurate analytical method is required to determine the total H2S concentration of these residual fuel oils. This test method was developed so refiners, fuel terminal operators, and independent testing laboratory personnel can analytically measure the amount of H2S in residual fuel oils.
Test Method D 5705 provides a simple and consistent field test method for the rapid determination of H2S in the residual fuel oils storage tank vapor phase. However, it does not necessarily simulate the vapor phase H2S concentration of a fuel storage tank nor does it provide any indication of the liquid phase H2S concentration. This test method provides a quantitative measure of a residual fuel oils liquid phase H2S concentration. It requires a laboratory and a skilled operator to perform the test but gives a more quantitative indication of potential H2S exposure than Test Method D 5705.
Note 1-Because of the reactivity, absorptivity, and volatility of H2S any measurement method only provides an H2S concentration at a given moment in time.View Less
1.1 This test method covers a method suitable for measuring the total amount of hydrogen sulfide (H2S) in heavy distillates, heavy distillate/residual fuel blends, or residual fuels as defined in Specification D 396 Grade 4, 5 (Light), 5 (Heavy), and 6, when the H2S concentration in the fuel is in the 0.01 to 100 g/g (ppmw) range.
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. For specific warning statements, see 5.1, 7.5, 8.2, 9.2, 10.1.4, and 11.1.