色谱法测定制浆造纸工业漂白废液中的草酸浓度(英文)  

CHROMATOGRAPHIC METHOD FOR DETERMINATION OF OXALIC ACID IN BLEACHING FILTRATES FROM THE PULP AND PAPER INDUSTRY

作　　者：洪枫[1] EIMANN Anders JNSSON Leif-j NILVEBRANT Nils-olof 

机构地区：[1]东华大学化学与化工学院,上海200051 [2]瑞典制浆造纸研究所(STFI) [3]卡尔斯大德大学化学部

出　　处：《林产化学与工业》2005年第1期23-28,共6页Chemistry and Industry of Forest Products

摘　　要：近年来草酸钙(草酸垢)的形成在制浆造纸工业中造成诸多问题,因此如何分析及控制漂白废液中的草酸浓度就显得尤为重要。高效液相色谱和离子交换色谱等色谱法一般可以作为测定草酸的标准方法。本研究以一个基于阴离子交换柱的离子交换色谱法作为对照方法,利用一套配备了AminexHPX-87H液相色谱柱的高效液相色谱系统测定漂白废液中的草酸浓度。结果显示,漂白废液中含有一些干扰高效液相色谱法测定的化合物。通过采用稀释样品后再经活性炭吸附的处理方法,可以得到较为满意的结果。分析发现高效液相色谱法与离子交换色谱(对照法)之间的相关性较好,相关系数为 0. 994。该方法的建立将有利于监控制浆造纸企业中闭路循环漂液中形成草酸钙时的临界草酸浓度。Analysis and control of oxalic acid in bleaching filtrates has recently gained considerable attention in the pulp and paper industry due to problems with the formation of calcium oxalate scaling.Chromatographic methods,such as HPLC and ion chromatography(IC),are generally valuable as standard methods for determination of oxalic acid.In this study,a HPLC system equipped with an Aminex HPX-87H column was applied to determine oxalic acid in (authentic) bleaching filtrates.An established IC method based on separation with an anion-exchange column was used as reference method.The results showed that bleaching filtrates contain compounds interfering with the HPLC method.A strategy, dilution of the samples followed by treatment with activated carbon,was needed to obtain similar oxalic acid concentrations as provided by the reference method.The correlation(R=0.994) between the HPLC method and the IC method is described by the equation y=1.294 7x.The method improves the possibility for control of critical (oxalic) acid concentration in closed-loop bleaching streams.

关 键 词：草酸 漂白废液 活性炭 制浆造纸工业 

分 类 号：X793[环境科学与工程—环境工程] TQ424.1[化学工程]