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Determination of Trace Silver in Polymetallic Ore Samples by Flame Atomic Absorption Spectrometry after Solid‐Phase Extraction Using a Microcolumn Comprising Eggshell Membrane
Author(s) -
Cheng Xianzhong,
Shao Kun,
Shen Shangyue,
Hu Shenghong,
Qiu Haiou
Publication year - 2011
Publication title -
geostandards and geoanalytical research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.037
H-Index - 73
eISSN - 1751-908X
pISSN - 1639-4488
DOI - 10.1111/j.1751-908x.2011.00101.x
Subject(s) - chemistry , solid phase extraction , eggshell membrane , extraction (chemistry) , adsorption , atomic absorption spectroscopy , elution , detection limit , certified reference materials , analytical chemistry (journal) , volumetric flow rate , column chromatography , chromatography , membrane , quantum mechanics , biochemistry , physics , organic chemistry
A rapid and inexpensive method was developed for the determination of trace silver in polymetallic ore samples by use of eggshell membrane (ESM), a natural biomaterial, as the solid‐phase extraction (SPE) adsorbent coupled with flame atomic absorption spectrometry (FAAS). The ESM was used for the separation/pre‐concentration of silver, and the parameters affecting sensitivity, such as pH, sample flow rate, eluent volume and eluent flow rate, were carefully investigated. ESM was found to be an effective solid phase extractant for the adsorption of trace silver over a wide range of acidity from 0.02 to 0.50 mol l −1 HNO 3 . The sample solution in 0.4 mol l −1 HNO 3 was pumped through an ESM microcolumn at the rate of 1.0 ml min −1 . Silver was absorbed, and then eluted with a solution of 1.0% m/v thiourea–0.5% v/v HCl. Under these optimal conditions, ESM exhibited a good enrichment efficiency for silver with a dynamic adsorption capacity of 1.7 mg g −1 . The proposed method was applied to the FAAS determination of trace silver in polymetallic ores and geological reference materials, GSO‐2, 3 and 5, and GSD‐11, GSD‐12, and the determined values were in good agreement with certified values.