Determination of vanadium in urine by electrothermal atomic absorption spectrometry using hot injection and preconcentration into the graphite tube

Journal of the Brazilian Chemical Society

Fernandes, Kelly G.¹  Universidade Federal de São Carlos, São Carlos, Brazil¹  Nogueira, Ana Rita A.¹  Gomes Neto, José A.¹  Nóbrega, Joaquim A.¹  Embrapa Pecuária Sudeste, São Carlos, Brazil¹  Universidade Estadual Paulista, Araraquara, Brazil¹ 

关键词: vanadium;    urine;    ETAAS;    preconcentration;    hot injection;   

DOI  :  10.1590/S0103-50532004000500011

学科分类：化学（综合）

来源: SciELO

【 摘 要 】

In 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 µL 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 µL s-1. The limits of detection and quantification were 0.54 and 1.82 without preconcentration, and 0.11 and 0.37 µg 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 µg L-1 V. The developed procedure allows the determination of vanadium in urine without any sample pretreatment and with minimal dilution of the sample.

【 授权许可】

Unknown