01782naa a2200217 a 450000100080000000500110000800800410001910000210006024501760008126000090025752010850026665000100135165000130136165300100137465300190138465300210140370000260142470000220145070000200147277300720149210468812022-05-31       2004    bl uuuu     u00u1 u    #d1 aFERNANDES, K. G.  aDetermination of vanadium in urine by electrothermal atomic absorption spectrometry using hot injection and preconcentration into the graphite tube.h[electronic resource]  c2004  aIn this work it was developed a procedure for the determination of vanadium in urine samples by electrothermal atomic absorption spectrometry using successive injections for preconcentration into a preheated graphite tube. Three 60?L volumes were sequentially injected into the atomizer preheated to a temperature of 110 ºC. Drying and pyrolysis steps were carried out after each injection. A chemical modifier, barium difluoride (100 mg L-1), and a surfactant, Triton X-100 (0.3% v v-1), were added to the urine sample. When injecting into a hot graphite tube, the sample flow-rate was 0.5?L s-1. The limits of detection and quantification were 0.54 and 1.82 without preconcentration, and 0.11 and 0.37 ?g L-1 with preconcentration, respectively. The accuracy of the procedure was evaluated by an addition-recovery experiment employing urine samples. Recoveries varied from 96.0 to 103% for additions ranging from 0.8 to 3.5 ?g L -1 V. The developed procedure allows the determination of vanadium in urine without any sample pretreatment and with minimal dilution of the sample.  aurine  avanadium  aETAAS  aHot injecction  aPreconcentration1 aNOGUEIRA, A. R. de A.1 aGOMES NETO, J. A.1 aNÓBREGA, J. A.  tJournal of Braziliand Chemical Societygv.15, n.5, p.676-681, 2004.