Determination of Trace Elements in Manganese Salts after Preliminary Matrix Separation
 
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1
Institute of Chemistry, Faculty of Science, Sts. Cyril and Methodius University, Skopje, Macedonia
2
Faculty of Chemistry, University of Sofia, 1126 Sofia, Bulgaria
CORRESPONDING AUTHOR
Rajče Z. Stafilov   

Institute of Chemistry, Faculty of Science, Sts. Cyril and Methodius University, Skopje, Macedonia
Online publish date: 2007-10-01
Publish date: 2007-10-01
 
Eurasian J Anal Chem 2008;3(1):1–9
KEYWORDS
ABSTRACT
The analytical procedure for trace elements (Co, Cr, Cu, Fe, Pb and Zn) determination in various manganese salts (manganese sulfate, manganese chloride) is described. Preliminary separation of matrix element is based on the different kinetics of reextraction of dithiocarbamate complexes of the trace elements and manganese. Analytical procedure consists of following steps: simultaneous extraction of dithiocarbamate complexes of analytes and matrix element in isobutylmethyl ketone (IBMK), reextraction of manganese dithiocarbamate in aqueous phase and FAAS or ETAAS measurement of trace elements in the organic phase. The method is adapted also for ICP-AES measurements by using the second step of reextraction of the trace analytes (after manganese reextraction) in 4 mol L-1 HNO3. Several parameters which are the most important for quantitative separation of matrix element without losses of trace elements were optimized by using model experiments. Optimal instrumental parameters for ETAAS/FAAS measurements in IBMK are presented. The accuracy and precision of the proposed analytical procedure was verified by the method of standard additions and by comparative analysis using routine ETAAS after sample dissolution in H2O. Detection limits achieved are 0.01 μg g-1 for Co, Cr, Cu (ETAAS determination) and Zn (FAAS determination) and 0.02 μg g-1 for Fe (ETAAS determination) and Pb (ETAAS determination). Relative standard deviation varied in the range from 2 to 12% for all studied elements at levels of content from 0.04 to 1 μg g-1.
 
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