本文件规定了一种波长色散X射线荧光（WDXRF）测试方法，用于测定5 mg/kg至500 mg/kg的液体均质汽车燃料的硫含量，该燃料的最大氧含量为3.7%（m/m）。该产品系列涵盖: -含有至多约30%(V/V)脂肪酸甲酯(FAME)的柴油燃料， -含有至多约10%(V/V)乙醇的车用汽油， -合成燃料，例如硫含量在5mg/kg至45mg/kg范围内的加氢处理植物油(HVO)和气液(GTL)。 氧含量较高的产品显示出显著的基质效应，例如用作生物柴油的纯FAME，然而，当遵循相应的程序时，可以分析纯FAME（见5.3和8.1）。 其他产品也可以用该测试方法进行分析，但本文件中未确定上述产品以外产品的精密度数据。注1样品稀释后可测定高于500 mg/kg的硫含量，但未确定稀释样品的精密度。 注2就本文件而言，“%(m/m)”和“%(V/V)”分别用于表示材料的质量分数w和体积分数φ。

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. NOTE 1 Sulfur contents higher than 500 mg/kg can be determined after sample dilution, however, the precision was not established for diluted samples. NOTE 2 For the purposes of this document, "% (m/m)" and "% (V/V)" are used to represent the mass fraction, w, and the volume fraction, φ, of a material respectively.