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泡塑吸附分离萃取光度法测定粉煤灰中的镓 被引量:8

Determination of Gallium in Coal Ash Samples by Photometry after Separation and Pre-concentration with Polyurethane Foam Adsorption-Solvent Extraction
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摘要 试验了在盐酸介质中聚氨酯泡沫塑料吸附分离镓的性能,将该性能用于粉煤灰分离镓的预处理过程,罗丹明B萃取光度法定量测定镓含量。结果表明,室温条件下,在6 mol/L盐酸溶液中,聚氨酯泡沫塑料对镓有良好的吸附性能,90 m in可达吸附平衡,饱和吸附量为每克泡塑可吸附42 mg镓;被吸附的镓可用0.5 mol/L氯化铵溶液定量洗脱;用罗丹明B萃取光度法测定镓含量时,镓浓度在0~1.0μg/mL服从比尔定律,检出限为0.008 mg/L。测定粉煤灰样品中镓的含量,加标回收率在103%~107%,相对标准偏差(RSD,n=20)为1.5%,富集分离效果明显,选择性高。 The adsorption and separation performances of polyurethane foam for gallium in HCl medium and the application for the sample pretreatment in rhodamine B solvent extraction photometric determination of gallium in coal ash samples were studied.The results showed that the polyurethane foam provided the excellent adsorption features for gallium in 6 mol/L HCl medium at room temperature.The adsorption equilibrium could be reached after 90 minutes with saturated adsorptive capacity of 42 mg Ga per gram of polyurethane foam.The gallium adsorbed could be quantitatively eluted with 0.5 mol/L NH4Cl solution.Beer′s law was obeyed in the concentration range of 0~1.0 μg/mL for gallium with the detection limit of 0.008 mg/L.Recovery of the method for gallium was 103%~107% with precision of 1.5%RSD(n=20).The method has been applied to the determination of gallium in coal ash samples with advantage of high selectivity.
作者 赵慧玲 刘建
出处 《岩矿测试》 CAS CSCD 北大核心 2010年第4期465-468,共4页 Rock and Mineral Analysis
关键词 聚氨酯泡沫塑料 吸附分离 粉煤灰 gallium polyurethane foam adsorption separation coal ash
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