Journal
JOURNAL OF THE CHINESE CHEMICAL SOCIETY
Volume 56, Issue 4, Pages 725-728Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/jccs.200900108
Keywords
Solid-phase extraction; Naphthalene; Silver; Dithizone; Flame atomic absorption spectrometry
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Funding
- Shahid Chamran University Research Council [1387]
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A solid-phase extraction method for preconcentration of silver and consequent determination by atomic absorption spectrometry is described. The method is based on the adsorption of silver on naphthalene modified with dithizone in a column. The adsorbed silver is eluted from the column with a thiourea solution and determined by flame atomic absorption spectrometry. The adsorption conditions including pH, reagent concentration, eluent volume, flow rate and interfering ions were investigated. The calibration graph was linear in the range 10-1000 ng mL(-1) of Ag in the initial solution with r = 0.9998. The limit of detection based on 3S(b) was 3.9 ng mL(-1). The relative standard deviation for ten replicate measurements of 40 and 600 ng mL(-1) of Ag was 4.4% and 0.9%, respectively. The method was applied to the determination of silver in mineral, radiology film and wound dressing samples.
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