燃料用二甲醚 (DME). 高温 (105 ℃) 蒸发残留物的测定. 质量分析法

[中文适用范围]： 本标准规定了用质量分析法测定燃料二甲醚高温（105℃）蒸发残渣的方法。 该程序适用于测定高温 (105 °C) 蒸发残留物的量，最高可达 ISO 16861 中规定的值。 可应用多种测试来测定液化产品中蒸发残留物的量。 其中，该国际标准规定了具有足以满足 ISO 16861 中 DME 规范的检测限的方法，与其他方法相比，使用更少的资源。 当需要更精确的定量测试时，建议使用 ISO 13757 代替本国际标准。 由于所采用的程序，沸点低于 105 °C 的蒸发残留物将无法测定。 注：该方法的精度已由有限数量的实验室针对有限的样品和含量水平进行了研究。 它允许建立 DME 的质量规范，但不能被视为符合 ISO 4259 中常用统计方法的完全精确测定。 [外文原描述]： ISO 17786:2015 specifies a procedure of test for high temperature (105 °C) evaporation residue in DME used as fuel by the mass analysis method. This procedure is applicable to determine the amount of high temperature (105 °C) evaporation residue up to the value specified in ISO 16861. Several tests can be applied to determine amount of evaporation residue in liquefied products. Among them, this International Standard specifies the method that has detection limit sufficient for a DME specification in ISO 16861, using less resource compared to other methods. When more precise quantitative test is required, use of ISO 13757 instead of this International Standard is recommended. Because of the procedure applied, the evaporation residue which has a boiling point lower than 105 °C will not be determined. NOTE The precision of this method has been studied for a limited set of samples and content levels by a limited amount of labs. It allows establishment of a quality specification of DME but cannot be considered as a full precision determination in line with the usual statistical methodology as in ISO 4259.