壳聚糖预分离富集-离子色谱法测定痕量草酸根  

Preconcentration and Separation of Trace Amounts of Oxalate with Chitosan and Determination by Ion Chromatography

作　　者：沈敏[1] 田莉[1] 薛爱芳[1] 李胜清[1] 陈浩[1] 李秀娟[2] 

机构地区：[1]华中农业大学理学院化学系,武汉430070 [2]华中农业大学食品科学技术学院,武汉430070

出　　处：《分析科学学报》2008年第3期299-302,共4页Journal of Analytical Science

摘　　要：本文通过壳聚糖(CTS)对水样中草酸根的预富集,利用离子色谱作为检测手段,建立了测定痕量草酸根的新方法。研究了CTS对C2O42-的吸附行为,考察了吸附时间、CTS用量、共存离子等对吸附率的影响。结果表明:在pH=3.0时,CTS对C2O42-的吸附率最大,可达100%;吸附后的C2O42-用0.1 mol/L的NaOH即可定量解吸,解吸率为96%;C2O42-的检出限为4.3μg/L,相对标准偏差(RSD)为7%(n=6)。CTS对C2O42-的等温吸附特性符合Langmuir方程,其饱和吸附量为194.0 mg/g。本方法用于水样中C2O42-的测定,结果满意。A novel method based on ion chromatography has been developed for the separation and preconcentration of trace oxalate using chitosan （CTS） as adsorbent. The effects of preconcentration time, dosage of chitosan and co-existing ions have been investigated. It was found that the adsorption rate of chitosan for oxalate was near 100% at pH 3. 0. Under the optimum conditions, the adsorbed oxalate can be quantitatively eluted by 5.0 mL of 0.1 mol/L NaOH and the desorption rate was 96%. The detection limit （S/N = 3, n = 6） for the oxalate was 4. 3 μg/L with relative standard deviation （RSD） of 7%. The adsorption equilibrium was well described by Langmuir isotherm model, and the maximum adsorption capacity of oxalate on CTS was 194.0 mg/g. The proposed method was applied to the determination of trace oxalate in water samples with satisfactory results.

关 键 词：壳聚糖 预富集 离子色谱法 草酸根 

分 类 号：O657.75[理学—分析化学]