IP 570: Determination of hydrogen sulfide in fuel oils — Rapid liquid phase extraction method

Overview:

This document specifies procedures for the determination of the hydrogen sulfide (H2S) content of fuel oils including marine residual
fuels, distillates and petroleum blend stocks with viscosities up to 3 000 mm2s-1 at 50 °C as measured in the liquid phase. The method covers two procedures (A and B) and the relevant apparatus.

NOTE 1 This standard is suitable for materials with a viscosity of over 3 000 mm2s-1 at 50 °C, (see 7.2.1), but the precision can be affected.

NOTE 2 For the purposes of this standard, the terms “% (m/m)” and “% (V/V)” are used to represent respectively the mass fraction and the volume fraction.

NOTE 3 Some samples can give elevated hydrogen sulfide readings, when measured by procedure B, if
they contain interfering compounds such as thiols or alkyl sulfides with a concentration above approximately 5 mg/kg. Elevated readings, as mentioned, are eliminated by following Procedure A.

NOTE 4 Samples containing FAME do not affect the measurement of hydrogen sulfide by this test method.

NOTE 5 A procedure for measuring the amount of hydrogen sulfide in crude oil can be found in Appendix B. Full precision for Appendix B has not yet been determined.