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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
收稿日期:  
DOI:10.11980/j.issn.0254-508X.2014.05.004
关键词:  离子色谱  有机酸  桉木  热水预水解
Key Words:ion chromatography  organic acid  eucalyptus  hot-water prehydrolysis
基金项目: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)。
作者单位
崔金龙 大连工业大学,辽宁大连,116034 
郭怀泽 大连工业大学,辽宁大连,116034 
李海明* 大连工业大学,辽宁大连,116034 
周景辉 大连工业大学,辽宁大连,116034 
韩 颖 大连工业大学,辽宁大连,116034 
毕佳捷 大连工业大学,辽宁大连,116034 
王 安 大连工业大学,辽宁大连,116034 
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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IonPacTM AS11-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12.5 μg/L、6.3 μg/L、18.8 μg/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。
Abstract: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 IonPacTM AS11-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.
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