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《Analytical Laboratory》 2002-04
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<title>Flow-injection on-line TOA extraction resin separation and preconcentraction system for determination of trace silver by flame atomic absorption spectrometry

Yang Liu,Zhou Fangqin and Long Sihua(College of Chemistry, Xiangtan University, Xiangtan, 411105)  
AbstrcatAn efficient flowinjection online Trinoclylamine(TOA) extraction resin separation and preconcentraction system was proposed for determination of trace silver by flame atomic absorption spectrometry. The microcolumn used was packed with TOA extraction resin as stationary phase. Sample in 1.0 mol/L HCl was pumped through a microcolumn at the rate of 8.1 mL/min. After 60 s of sampling and 60 s of elution, silver was absorbed and then eluted into the nebulizer of FAAS by 0.25 mol/L HCl0.5 mol/L thiourea. At the analytical frequency of 30/h, an enrichment factor of 26, a concentration efficiency of 26/min and a consumptive index of 0.31 mL were obtained. The linear calibration range for Ag is 0~1000 μg/L with detection limit (3σ) of 1.2 μg/L. The relative standard deviation at the 50μg/L level is 1.4%. The proposed method was applied to determination of trace silver in leadzinc waste slag and spectrum magnesium oxide reagent successfully.
【Fund】: .NULL.
【CateGory Index】: O657.32
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