Determination of total selenium in geological samples by HG-AFS? After enrichment with thiol cotton fiber

Abstract

Standard reference material and different geological samples were dissolved by system A(the mixture of nitric,perchloric acids) and system B(the mixture of nitric,perchloric and hydrofluoric acids),and total Se in all the samples was measured by hydride generation atomic fluorescence spectrometry(HG-AFS) after enrichment with thiol cotton fiber(TCF).The agreement is very good(within error) for most of the samples,particularly for those having recommended values with two different digestion methods.The Se concentrations found in our study by the two methods are identical,the correlation coefficient is 0.9986;the relative standard deviation(RSD) for the determination of 0.04 μg/g Se is 10.2%;and the recovery of systems A and B are 96%—106% and 99%—104%,respectively.