ASTM D7621-12

1.1 This test method covers a procedure for the determination of the hydrogen sulfide (H₂S) content of fuel oils such as marine residual fuels and blend stocks, in the range 0.40 to 15.0 mg/kg as measured in the liquid phase.

1.2 This test method is applicable for materials with a viscosity up to 3000 mm²s^-1 at 50°C.

Note 1 - ASTM specification fuels falling within the scope of this test method are: Specification D396 Grade Nos 5 (light), 5 (heavy) and 6.

1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.4 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.