苯乙烯中烃类杂质定量方式对比研究

A Comparative Study of the Determination of Hydrocarbon Impurities in Styrene

通过实际样品测试,对气相色谱法测定苯乙烯中烃类杂质的内标法、实测校正面积归一化法和有效碳数校正面积归一化法3种定量方式进行分析、讨论。结果表明,3种定量方式之间无显著性差异,精密度和准确度均能满足GB/T12688.1-2019检测要求。实测校正面积归一化法和有效碳数校正面积归一化法中每种杂质在3种不同浓度下的平均相对标准偏差(RSD)不超过2.99%,每种杂质的平均回收率范围集中在92.3%~106.0%。因此,推荐操作相对简单、无需添加内标物和配制标准曲线的实测校正面积归一化法和有效碳数校正面积归一化法2种定量方式。

The internal standard method, area correction normalization and the effective carbon number(ECN) correction factors for the determination of hydrocarbon impurities in styrene by gas chromatography were analyzed and discussed through the actual sample test. The results showed that there was no significant difference among the three quantitative methods, which meet the technical requirements of GB/T12688.1-2019 for precision and accuracy. The mean relative standard deviation of various impurities of both the area correction normalization and ECN correction factors was not more than 2.99% at different concentrations, the average recovery of each impurity ranged from 92.3% to 106.0%. Therefore, the area correction normalization and ECN correction factors are recommended, which are relatively simple and do not need to add internal standard and prepare standard curve.