ISO 6974-6:2002描述了使用三个毛细管柱定量测定天然气样品中氦，氢，氧，氮，二氧化碳和C1至C8烃含量的气相色谱法。该方法适用于根据所分析的成分，根据所分析的成分，测定这些气体的摩尔分数范围为0,000 1〜40％，通常用于实验室应用。但是，仅适用于40％〜100％摩尔分数范围内的甲烷。这些范围不表示检测限，而是表示该方法规定的精度的限制。虽然样品中的一种或多种组分可能不存在于可检测的水平，但该方法仍然可以应用。 ISO 6974-6:2002仅适用于与ISO 6974-1:2000和ISO 6974-2:2001结合使用。 这种方法也适用于天然气替代品的分析。关于这种方法适用于确定天然气替代品的更多信息也将在相关的情况下给出

ISO 6974-6:2002 describes a gas chromatographic method for the quantitative determination of the content of helium, hydrogen, oxygen, nitrogen, carbon dioxide and C1 to C8 hydrocarbons in natural gas samples using three capillary columns. This method is applicable to the determination of these gases within the mole fraction ranges varying from 0,000 1 % to 40 %, depending on the component analysed, and is commonly used for laboratory applications. However, it is only applicable to methane within the mole fraction range of 40 % to 100 %. These ranges do not represent the limits of detection, but the limits within which the stated precision of the method applies. Although one or more components in a sample may not be present at detectable levels, the method can still be applicable. ISO 6974-6:2002 is only applicable if used in conjunction with ISO 6974-1:2000 and ISO 6974-2:2001. This method can also be applicable to the analysis of natural gas substitutes. Additional information on the applicability of this method to the determination of natural gas substitutes is also given where relevant.