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Determination of Chromium in Geological Samples with Slurry Sampling a nd Probe Atomization in GFAAS

Shuen HOU and Cheng CHANG Central Laboratory,China University of Geosciences,430074 Wuhan  
A method of loading a slurry prepared from a sol id sample for analysis of chromium in geological samples using graphite furnace atomic absorption spectrometry had been approached by combining slurry sampling with probe atomization.The factors that influence the performances of chromium i ncluding ashing and atomization temperature,atomization surfaces were investigat ed.The results showed that the determination of chromium in geological samples c ould be performed by direct slurry sampling with the use of a calibration establ ished with aqueous standards.The relative standard deviations(RSD) of the method were 3.0%—6.5%.The detection limit was 5.1×10- -12 g Cr.The Analy tical results of the geological reference samples were consistent with the certi fied values.
【Fund】: 国土资源部“九五”重点科技项目!(95 0 5 6 16 -3.4)基金资助课题
【CateGory Index】: O657.3
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