桉木热水预水解液有机酸离子色谱分析  

Determination of Organic Acids in Extraction Liquor from Hot-water Prehydrolysis of Eucalyptus by Ion Chromatography

作　　者：崔金龙[1] 郭怀泽 李海明[1] 周景辉[1] 韩颖[1] 毕佳捷 王安[1] 

机构地区：[1]大连工业大学,辽宁大连116034

出　　处：《中国造纸》2014年第5期20-23,共4页China Pulp & Paper

基　　金：国家自然科学基金资助项目(31370584);制浆造纸工程国家重点实验室开放基金项目(201113);辽宁省教育厅项目(L2012185)

摘　　要：建立了离子色谱法直接分析桉木热水预水解液中有机酸的方法,样品经简单处理后,就可采用离子色谱仪进行检测。结果表明,用IonPacTMAS11-HC阴离子分析柱(250 mm×4 mm),在2.0 mmol/L NaOH溶液等梯度淋洗15.0 min、淋洗液流速1.0 mL/min的条件下,用电导检测器可以测定桉木热水预水解液中的乙酸、甲酸和乙酰丙酸。乙酸、甲酸和乙酰丙酸的检出限分别为12.5μg/L、6.3μg/L、18.8μg/L,相关系数(r2)分别为0.9999、0.9997、0.9990,相对标准偏差(RSD)分别为1.91%、0.82%、1.96%,加标回收率分别为98.02%、103.00%、96.00%;该法具有操作简单、快速、结果准确、重现性好等优点。A method for the determination of organic acids in extraction liquor from hot-water prehydrolysis of eucalyptus by an ion chromatography was developed. After simply treatment of the samples,the extraction liquor was analyzed using Dionex ICS-5000 ion-exchange chromatography with conductivity detector. The experimental results showed that acetic acid,formic acid and levulinic acid in the extraction liquor were separated on a IonPacTMAS11-HC anion-column（ 250 mm × 4 mm） by using 2. 0 mmol / L NaOH as mobile phase to isocratically elute at a flow rate of 1. 0 mL / min in 15 minutes. Detection limits of acetic acid,formic acid and levulinic acid were 12. 5 μg / L,6. 3 μg / L and 18. 8 μg / L,respectively. The correlation coefficients were 0. 9999,0. 9997 and 0. 9990,respectively. Relative standard deviations（ RSD） of repeated analyses were 1. 91%,0. 82% and 1. 96%,respectively. Recovery rates were 98. 02%,103. 00% and 96. 00%,respectively. The method developed was fast and easy to operate,with high accuracy and good repeatability.

关 键 词：离子色谱 有机酸 桉木 热水预水解 

分 类 号：O657.7[理学—分析化学] TS721.1[理学—化学]