Citation: XIE Fa-Zhi, ZHANG Feng-Jun, XUAN Han, GE Ye-Jun, WANG Ying. Determination of Trace Copper in Environmental Samples by Flame Atomic Absorption Spectrometry After On-line Selective Preconcentration with Thioacetamide Modified Silica Gel Mini-Column[J]. Chinese Journal of Analytical Chemistry, ;2012, 40(11): 1720-1724. doi: 10.3724/SP.J.1096.2012.20218 shu

Determination of Trace Copper in Environmental Samples by Flame Atomic Absorption Spectrometry After On-line Selective Preconcentration with Thioacetamide Modified Silica Gel Mini-Column

1.
School of Materials Science and Chemical Engineering, Anhui University of Architecture, Hefei 230022, China

Corresponding author: XIE Fa-Zhi,
Received Date: 3 March 2012
Available Online: 26 May 2012
Fund Project: 本文系国家科技支撑计划项目(No.2011BAJ03B04) (No.2011BAJ03B04)国家自然科学基金项目(No.21107001)资助 (No.21107001)

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 2.0-100.0 μg/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.
- On-line,
- Preconcentration,
- Flame atomic absorption spectrometry,
- Copper,
- Environmental samples
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沈阳化工大学材料科学与工程学院沈阳 110142