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7940994 
Journal Article 
Sorption behavior of vanadium on silica gel modified with tetrakis(4-carboxyphenyl)porphyrin 
Pyrzyńska, K; Wierzbicki, T 
2005 
Yes 
Analytical Sciences
ISSN: 0910-6340
EISSN: 1348-2246 
21 
8 
951-954 
English 
16122166 
WOS:000231180200011 
Tetrakis(4-carboxyphenyl)porphyrin (TCPP) has been loaded on aminopropyl-silica gel by physical adsorption and by direct immobilization through formation of an amide bond to obtain chelating sorbents. These sorbents have been studied for preconcentration and separation of vanadium prior to its determination by atomic absorption spectrometry. Several parameters, such as sorption capacity of the chelating resin, pH for retention of V(IV) and V(V), volume of sample and eluent, were evaluated. Both vanadium species sorbed on TCPP-modified resin could be eluted using 2 mol L(-1) nitric acid solution. The recovery values were > 94% and preconcentration factor of 160 was obtained. For speciation analysis, cyclohexane-1,2-diaminetetraacetic acid (CDTA) was added to the sample for complexation of vanadium(IV), which was not retained on the microcolumn. The proposed method was examined for reference standard materials (TM-25.2 and CAAS-3) as well as for river water samples.