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Cadmium, lead, copper and manganese determination in human deciduous teeth by electrothermal atomic absorption spectrometry using a lanthanum, palladium and citric acid mixture as chemical modifier
Ist Teil von
International journal of environmental analytical chemistry, 2008-10, Vol.88 (12), p.869-878
Ort / Verlag
Taylor & Francis Group
Erscheinungsjahr
2008
Link zum Volltext
Quelle
Taylor & Francis
Beschreibungen/Notizen
Cadmium, lead, copper and manganese were determined in human deciduous teeth and bone ash 1400 standard reference material by electrothermal atomic absorption spectrometry (ETAAS), using a lanthanum + palladium + citric acid (CA) modifier mixture. Optimum masses and mass ratios of La, La + Pd and La + Pd + CA modifiers for analytes in bone ash 1400 sample solution were investigated. Pyrolysis and atomization temperatures of analytes in a tooth sample solution were obtained with and without modifiers. The mixture of La + Pd + CA was found to be preferable for the determination of analytes in tooth samples and bone ash 1400, dissolved in a mixture of HNO
3
+ H
2
O
2
. The detection limits and characteristic masses of analytes were obtained with or without modifiers based on integrated absorbance for tooth sample solution (2% m/v). The detection limits obtained with La + Pd + CA are 6,24,16 and 46 ng g
−1
for Cd, Cu, Mn and Pb, respectively. Recovery tests for analytes in bone ash 1400 and a tooth solution with La and La + Pd + CA modifier mixture were studied and compared with certified and non certified values. The La + Pd + CA mixture was also applied to the determination of Cd, Pb, Cu and Mn in tooth samples.