离子色谱法测定活性染料臭氧化产物中的阴离子

Determination of Anions in the Products of Ozonation of Reactive Dye by Ion Chromatography

建立了用离子色谱测定未经水解的活性红 1 2 0 (C I ReactiveRed 1 2 0 )染料臭氧化产物中的阴离子的方法。染料样品经OnGuardP型前处理柱过滤后可有效去除其中一些有机物 (如偶氮化合物 )。采用DionexIonPacAS 1 1色谱柱分离 ,NaOH溶液梯度洗脱 ,电导或紫外吸收检测 ,可在 1 8min内完成染料臭氧降解后产物中的阴离子(SO2 - 4,Cl- ,NO- 3,HCOO- 和C2 O2 - 4)的测定。 5种阴离子的加标回收率在 91 6 %～ 1 0 8 3 %。结合染料溶液常规参数的测定结果 ,对臭氧降解活性红 1 2

A method for the determination of anions in the degradation products of C I Reactive Red 120 by ozonation was investigated. The sample can be pretreated with a Dionex OnGuard P column, which has high selectivity for removing phenols, azo group contaning compounds, aromatic carboxylic aicds etc. For the separation of organic and inorganic anions in the products, the anion exchange chromatograhy with gradient elution of NaOH was used. All the species were detected by both suppressed conductivity and UV absorbance detectors. The sulfate, oxalate, chloride, nitrate and formate could be identified even in very low concentration with ion chromatography, within 18 min, with the recoveries between 91 6%-108 3%. The results indicate that the method is reliable, simple, rapid and especially sensitive. In combining with the determination results of conventional parameters of the solution of Reactive Red 120, a preliminary elucidation of the degradation mechanism is presented.