石油产品 - 汽车燃料硫含量的测定 - 波长色散X射线荧光光谱法

[中文适用范围]： 本文件规定了一种波长色散 X 射线荧光 (WDXRF) 测试方法，用于测定液态均质汽车燃料中硫含量从 5 mg/kg 到 500 mg/kg 不等的硫含量，这些燃料的最大氧含量为 3.7% (m/m)。本产品范围包括： — 含有高达约 30% (V/V) 脂肪酸甲酯 (FAME) 的柴油， — 含有高达约 10% (V/V) 乙醇的车用汽油， — 合成燃料，如加氢植物油 (HVO) 和气转液 (GTL)，硫含量在 5 mg/kg 至 45 mg/kg 范围内。含氧量较高的产品表现出明显的基质效应，例如用作生物柴油的纯 FAME，尽管如此，如果遵循相应的程序，也可以分析纯 FAME（见 5.3 和 8.1）。其他产品也可以用这种测试方法进行分析，但本文件尚未确定除上述产品以外的其他产品的精度数据。注 1 高于 500 mg/kg 的硫含量可在样品稀释后测定，但稀释样品的精度尚未确定。 注 2 在本文件中，“% (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。 [外文原描述]： 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.