ISO 20847:2004规定了一种能量色散X射线荧光(EDXRF)测试方法，用于测定车用汽油(包括含有至多2.7%(m/m)氧的那些)和柴油燃料(包括含有至多5%(V/V)脂肪酸甲酯(FAME)的那些)的硫含量，其硫含量在30mg/kg至500mg/kg的范围内。可以根据该测试方法分析其他产品和测定其他硫含量，但是，对于除汽车燃料以外的产品和超出ISO 20847:2004规定范围的结果，尚未建立精密度数据。由于光谱重叠的原因，ISO 20847:2004不适用于含铅车用汽油、含钾量为8毫克/千克至20毫克/千克的铅替代汽油，或含铅、硅、磷、钙、钾或卤化物的产品和原料，其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.