ISO 20847:2004规定了能量色散X射线荧光（EDXRF）测试方法，用于测定汽油的硫含量，包括含有高达2,7％（m/m）氧气的柴油和含柴油的硫含量，包括那些含有高达5％（V/V）脂肪酸甲酯（FAME）的硫含量在30mg/kg至500mg/kg范围内。可以分析其他产品，并根据该测试方法确定其他硫含量，但对于ISO 20847:2004，汽车燃料以外的产品和规定范围以外的结果没有精确数据。由于光谱重叠的原因，ISO 20847:2004不适用于含铅汽油，含8 mg/kg钾至20 mg/kg钾的铅替代汽油，或不含铅，硅，磷，钙，钾的产品和原料或者卤化物浓度大于所测硫浓度的十分之一

ISO 20847:2004 specifies an energy dispersive X-ray fluorescence (EDXRF) test method for the determination of the sulfur content of motor gasolines, including those containing up to 2,7 % (m/m) oxygen, and of diesel fuels, including those containing up to 5 % (V/V) fatty acid methylester (FAME), having sulfur contents in the range 30 mg/kg to 500 mg/kg. Other products may be analysed and other sulfur contents may be determined according to this test method, however, no precision data for products other than automotive fuels and for results outside the specified range have been established for ISO 20847:2004. For reasons of spectral overlap, ISO 20847:2004 is not applicable to leaded motor gasolines, lead-replacement gasolines containing 8 mg/kg potassium to 20 mg/kg potassium, or to products and feedstocks containing lead, silicon, phosporus, calcium, potassium or halides at concentrations greater than one-tenth of the concentration of sulfur measured.