• Method adopted/last revised:
• Method reapproved: None
• REF/ISBN:
• Status: Current
• First printed in STM books: 2021

This document specifies a wavelength-dispersive X-ray fluorescence (WDXRF) test method for the determination of the sulfur content of liquid,
homogeneous automotive fuels from 5 mg/kg  to 500 mg/kg, which have a maximum oxygen content of 3,7 % (m/m). This product range
covers:

— diesel fuels containing up to about 30 %
(V/V) fatty acid methyl esters (FAME),

— motor gasolines containing up to about
10 % (V/V) ethanol,

— synthetic fuels such as hydrotreated
vegetable oil (HVO) and gas to liquid
(GTL) having sulfur contents in the range
of 5 mg/kg to 45 mg/kg.

Products with higher oxygen content show significant matrix effects, e.g. pure FAME used as biodiesel, nevertheless, pure FAME can be analysed when the corresponding procedures are followed (see 5.3 and 8.1). Other products can be analysed with this test method, though precision data for products other than those mentioned have not been established for this document.