石油和相关产品 汽车燃料中低浓度硫的测定 能量色散X射线荧光光谱法

[中文适用范围]： 本文件规定了一种能量色散X射线荧光（EDXRF）测试方法，用于测定汽车燃料中的硫含量。本文件适用于： — 含氧量高达3.7%（质量百分比）的汽油（包括与乙醇混合的汽油，体积百分比高达10%），硫含量在6.9 mg/kg至56.7 mg/kg范围内； — 柴油，包括按体积计含氧量高达约30%的脂肪酸甲酯（FAME）、石蜡柴油和纯FAME，硫含量在5.0 mg/kg至60.2 mg/kg范围内。其他产品中的硫含量可根据本文件中规定的测试方法测定；但是，本文件没有为汽车燃料以外的产品和规定范围以外的结果建立精度数据。由于光谱重叠的原因，本文件不适用于含铅车用汽油、铅含量超过 8 mg/kg 的汽油或含有铅、硅、磷、钙、钾或卤化物且浓度超过测得的硫浓度的十分之一或超过 10 mg/kg（以较大者为准）的产品和原料。 [外文原描述]： This document specifies an energy dispersive X-ray fluorescence (EDXRF) test method for the determination of sulfur content in automotive fuels. This document is applicable to: — gasoline containing up to 3,7 % oxygen by mass (including those blended with ethanol up to 10 % by volume) having sulfur contents in the range of 6,9 mg/kg to 56,7 mg/kg, — diesel fuels including those containing up to about 30 % fatty acid methyl ester (FAME) by volume, paraffinic diesel fuel, and neat FAME, having sulfur contents in the range of 5,0 mg/kg to 60,2 mg/kg. The sulfur content in other products can be determined according to the test method specified in this document; however, no precision data for products other than automotive fuels and for results outside the specified range have been established for this document. For reasons of spectral overlap, this document is not applicable to leaded automotive gasoline, gasoline having a content of greater than 8 mg/kg lead or to product and feedstock containing lead, silicon, phosphorus, calcium, potassium or halides at concentrations greater than one tenth of the concentration of sulfur measured, or more than 10 mg/kg, whichever is the greater.