Removal of interfering elements in ICP-QMS for the determination of Pt, Rh, and Pd by chemically modified sample introduction capillaries.
New on-line methods developed for the determination of Pt, Rh, and Pd by inductively coupled plasma-quadrupole mass spectrometry (ICP-QMS) include separation of elements which might lead to spectral interference in the quadrupole instrument. The fused-silica capillaries generally used for transport of the sample to mu-flow nebulizers have been chemically modified with ion-exchanger compounds to remove interfering elements such as Cu, Pb, or Hf. Characterization of the modification procedures by atomic-force microscopy showed that the quality of the quartz material and the kind of modification had a decisive influence on the yield of surface modification, and thus the exchange capacity of the capillaries.
Riepe
H G
HG
Institut für Chemo- und Biosensorik, Münster, Germany.
Loreti
V
V
Garcia-Sanchez
R
R
Cámara
C
C
Bettmer
J
J