离子排斥色谱法测定甘油催化氧化产物中的H_2CO_3和HCOOH

Determination of carbonic acid and formic acid in the glycerol oxidation products by ion-exclusion chromatography

建立了测定甘油催化氧化产物中H2CO3和HCOOH的离子排斥色谱分析方法。采用离子排斥柱分离,分别用纯水和4 mmol/L HCl作流动相进行H2CO3和HCOOH的分析。检测方式为非抑制电导检测。实验结果显示,H2CO3和HCOOH工作曲线的线性范围为2～100 mg/L和6.23～124.6 mg/L,检出限分别为0.45 mg/L和2.49 mg/L(S/N=3)。H2CO3的保留时间和峰面积的相对标准偏差分别为0.07%和4.0%,HCOOH的保留时间和峰面积的相对标准偏差分别为0.09%和2.2%。方法已用于甘油催化氧化产物中H2CO3和HCOOH的分析。

An ion-exclusion chromatographic method was developed for the determination of carbonic acid and formic acid in the glycerol oxidation products.The separation was carried out on an ion-exclusion column with water as mobile phase for carbonic acid and 4 mmol/L HCl for formic acid.The detection mode was non-suppressed conductivity detection.As a result,good linear relationships were obtained in the range of 2-100 mg/L for carbonic acid and 6.23～124.6 mg/L for formic acid,The detection limits were 0.45 mg/L for carbonic acid and 2.49 mg/L for formic acid（S/N=3）.The relative standard deviations（RSD） of the peak areas and the retention times for carbonic acid were 0.07% and 4.0%,respectively.The relative standard deviations（RSD） of the peak areas and the retention times for formic acid were 0.09% and 2.2%,respectively.This method has been applied to the determination of carbonic acid and formic acid in the glycerol oxidation products