Direct determination of Cr and Cu in urine samples by electrothermal atomic absorption spectrometry using ruthenium as permanent modifier (R1).
In this study Ru, deposited thermally on an integrated platform pyrolytic graphite tube, is proposed as a permanent modifier for the determination of Cu and Cr in urine samples by electrothermal atomic absorption spectrometry. The samples were diluted 1:1 with nitric acid (1% v/v). Pyrolysis and atomization temperatures for spiked urine samples were 1,100 degrees C and 1,900 degrees C respectively for Cu, and 1,400 degrees C and 2,500 degrees C respectively for Cr. For comparison purposes, the conventional modification with Pd+Mg was also studied. The sensitivity for Ru as permanent modifier was higher for the two analytes. The characteristic masses were 7.3 and 17.7 for Cr and Cu. The detection limits (3sigma) were 0.22 and 0.32 microg/L, for Cr and Cu, respectively. Good agreement was obtained with certified urine samples for the two elements.
Lelis
Kátia Linces Alves
KL
lnstituto de Patologia Clínica Hermes Pardini, 30140-070 Belo Horizonte, MG, Brazil.
Magalhães
Cristina Gonçalves
CG
Rocha
Clélia Aparecida
CA
of Silva
José Bento Borba
JB
D002857:Chromium / Q000652:urine*; D003300:Copper / Q000652:urine*; D006801:Humans; D015203:Reproducibility of Results; D012428:Ruthenium / Q000737:chemistry*; D012680:Sensitivity and Specificity; D013054:Spectrophotometry, Atomic / Q000379:methods*; D013696:Temperature; D016482:Urinalysis / Q000379:methods*
D002857:Chromium; D003300:Copper; D012428:Ruthenium