Effectiveness of palladium matrix modification for the determination of thallium by graphite furnace atomic absorption spectrometry.
The effect of palladium matrix modification on the determination of thallium has been investigated. The effect of palladium combined either with ammonium nitrate or with magnesium nitrate on the sodium chloride interference was systematically studied and was compared with that of the classical sulfuric acid modifier. A combination of 6 micrograms palladium with 100 micrograms ammonium nitrate allows the direct determination of thallium in ten-fold diluted blood against matrix-free standards. The detection limit (3 sigma) in the undiluted blood was calculated to be 25 micrograms.1(-1). For the urine analysis the standard addition technique is recommended because a complete thallium recovery for all different urine samples studied was not always obtained.
Yang
Q
Q
Laboratory of Pharmaceutical and Biomedical Analyses, Farmaceutisch Institute, Vrije Universiteit Brussels, Belgium.
Smeyers-Verbeke
J
J
D006358:Hot Temperature; D006801:Humans; D007202:Indicators and Reagents; D008274:Magnesium; D017616:Magnesium Compounds; D009566:Nitrates; D010165:Palladium; D012965:Sodium Chloride / Q000032:analysis; D013054:Spectrophotometry, Atomic / Q000379:methods*; D013793:Thallium / Q000032:analysis* / Q000097:blood / Q000652:urine
D007202:Indicators and Reagents; D017616:Magnesium Compounds; D009566:Nitrates; D012965:Sodium Chloride; D010165:Palladium; C018330:magnesium nitrate; D013793:Thallium; D008274:Magnesium; C006568:ammonium nitrate