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

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  • Method adopted/last revised: 2015
  • Method reapproved: None
  • REF/ISBN: IP570-2938621
  • Status: Current
  • First printed in STM books: April 2018


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.

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