分析化学2012，Vol.40Issue(11)：1720-1724,5.DOI:10.3724/SP.J.1096.2012.20218
硫代乙酰胺键合硅胶在线选择性固相萃取火焰原子吸收测定环境样品中痕量铜
Determination of Trace Copper in Environmental Samples by Flame Atomic Absorption Spectrometry After On-line Selective Preconcentration with Thioacetamide Modified Silica Gel Mini-Column
摘要
Abstract
A selective and sensitive on-line preconcentration procedure was developed for the determination of trace levels of copper(Ⅱ) by flame atomic absorption spectrometry(FAAS). A mini-column packed with a silica gel functionalized with thioacetamide was used for the on-line selective enrichment of copper(Ⅱ) at pH 1. 0. The copper(Ⅱ) was eluted with 0. 6 mol/L thiourea solution and determined by FAAS. Some important flow injection variables affecting preconcentration were optimized (sample flow rate was 8. 0 mL/min, eluent flow rate was 5. 0 mL/min and elution time was 60 s). Under the optimum conditions, linear calibration graphs over the concentration ranges of 2. 0-100. 0μg/L and 0. 5 - 30. 0 μg/L; detection limits of 0. 36 and 0. 07 μg/L; preconcentration factor of 80 and 170 were obtained for the preconcentration volumes of 10. 0 and 50. 0 mL of copper(Ⅱ) solutions, respectively. The relative standard deviations for 9 replicate determinations of copper(Ⅱ) were 3. 5% and 2. 0% at same conditions, respectively. The effect of the presence of various species commonly associated with environmental samples was also investigated. The method has been successfully applied to the selective determination of the trace Copper in standard reference materials (GBW07602, GBW08608 with satisfactory results.关键词
在线/预富集/火焰原子吸收/铜/环境样品Key words
On-line/ Preconcentration/ Flame atomic absorption spectrometry/ Copper/ Environmental samples引用本文复制引用
谢发之,张峰君,宣寒,葛业君,王颖..硫代乙酰胺键合硅胶在线选择性固相萃取火焰原子吸收测定环境样品中痕量铜[J].分析化学,2012,40(11):1720-1724,5.基金项目
本文系国家科技支撑计划项目(No.2011BAJ03B04)和国家自然科学基金项目(No.21107001)资助 （No.2011BAJ03B04）
