title: [Determination of trace silver in water samples by solid phase extraction portable tungsten-coil electrothermal atomic absorption spectrometry].
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 x min(-1), and the mixture of 4% (m/v) thiourea and 2% (phi) nitrate acid with the eluent flow rate of 0.5 mL x min(-1) for desorption were selected for further studies. Under optimal conditions, a linear range of 0.20-4.00 ng x mL(-1), a limit of detection (3sigma) of 0.03 ng x mL(-1) and a preconcentration factor of 94 were achieved. The proposed method was validated by testing three environmental water samples with satisfactory results.
authors.affiliation: College of Chemistry, Sichuan University, Chengdu 610064, China. gyfan2006@yahoo.com.cn
authors.forename: Guang-yu
authors.initials: GY
authors.lastname: Fan
authors.forename: Xiao-ming
authors.initials: XM
authors.lastname: Jiang
authors.forename: Cheng-bin
authors.initials: CB
authors.lastname: Zheng
authors.forename: Xian-deng
authors.initials: XD
authors.lastname: Hou
authors.forename: Kai-lai
authors.initials: KL
authors.lastname: Xu