| 光谱学与光谱分析 |
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| Determination of Trace Silver in Water Samples by Solid Phase Extraction Portable Tungsten-Coil Electrothermal Atomic Absorption Spectrometry |
| FAN Guang-yu, JIANG Xiao-ming, ZHENG Cheng-bin, HOU Xian-deng, XU Kai-lai* |
| College of Chemistry, Sichuan University, Chengdu 610064, China |
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Abstract A simple method has been developed for the determination of silver in environmental water samples using solid phase extraction with tungsten-coil electrothermal atomic absorption spectrometry. Silica gel was used as an adsorbent and packed into a syringe barrel for solid phase extraction of silver prior to its determination by using a portable tungsten-coil electrothermal atomic absorption spectrometer. Optimum conditions for adsorption and desorption of silver ion, as well as interferences from co-existing ions, were investigated. A sample pH value of 6.0, a sample loading flow rate of 4.0 mL·min-1, and the mixture of 4%(m/v) thiourea and 2%(φ) nitrate acid with the eluent flow rate of 0.5 mL·min-1 for desorption were selected for further studies. Under optimal conditions, a linear range of 0.20～4.00 ng·mL-1, a limit of detection (3σ) of 0.03 ng·mL-1 and a preconcentration factor of 94 were achieved. The proposed method was validated by testing three environmental water samples with satisfactory results.
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Received: 2010-08-26
Accepted: 2010-11-26
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Corresponding Authors:
XU Kai-lai
E-mail: xukailai@scu.edu.cn
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