Ethylene glycol is a super commodity chemical and it has vital roles in various applications. Its co‐production with other chemicals, such as ethylene carbonate and glycerol carbonate, has promised cheaper production cost. Its quantification presents a challenge as its contaminants, such as ethylene carbonate, produce a signal‐reducing effect in flame ionized detector. The aim of this study is to evaluate external standard to quantify the composition of glycol mixture. Measurement system analysis was employed on the external standard method. Reliability of the external standard is statistically significant with low p‐values, excellent capability indices, and high F‐values. The external standard is found to have remarkable precision and trueness as both capability indices are mirroring each other. Furthermore, the capability analysis has a strong correlation with quality measurement. Based on capability indices, the limit of detection is recommended at S/N = 25 and the limit of quantification is recommended at S/N = 100 for a reliable measurement. A high degree of reliability is achieved coherently as almost all uncertainties of coefficients of variations are less than 5%. The established method was validated and successfully applied to glycol mixture at azeotropic distillation pilot plant.

中文翻译：

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使用乙二醇共沸混合物的外标测量系统分析和详细的不确定性

乙二醇是一种超级商品化学品，在各种应用中都起着至关重要的作用。它与其他化学品（例如碳酸亚乙酯和碳酸甘油酯）的联产已经保证了较低的生产成本。由于其污染物（例如碳酸亚乙酯）会在火焰离子化检测器中产生信号减弱效果，因此对其定量提出了挑战。这项研究的目的是评估外标，以量化乙二醇混合物的成分。采用外标法进行测量系统分析。低p值，出色的性能指数和高F值对外标的可靠性具有统计学意义。由于两个功能指标相互镜像，因此发现外部标准具有卓越的精度和真实性。此外，能力分析与质量测量有很强的相关性。根据能力指标，建议检测限为S / N = 25，定量限为S / N = 100，以实现可靠的测量。由于几乎所有变化系数的不确定性都小于5％，因此可以连贯地实现高度的可靠性。验证了所建立的方法，并将其成功应用于共沸蒸馏中试厂的乙二醇混合物中。