Modification of capillaries coupled to micro-flow nebulizers: a new strategy for on-line interference removal in inductively coupled plasma mass spectrometry
✍ Scribed by Hans-Gerd Riepe; Milagros Gómez; Carmen Cámara; Jörg Bettmer
- Publisher
- John Wiley and Sons
- Year
- 2000
- Tongue
- English
- Weight
- 150 KB
- Volume
- 35
- Category
- Article
- ISSN
- 1076-5174
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✦ Synopsis
The application of interference removal within modified silica capillaries for the introduction of liquid samples by a micro-flow nebulizer into an inductively coupled plasma quadrupole mass spectrometer is described using the example of 103 Rh and its mass interferences resulting from 63 Cu (ArCu Y ), 87 Rb (RbO Y ), 87 Sr (SrO Y ) and 206 Pb (Pb 2Y ). A strong cation exchanger was covalently bound to the capillary surface and its ability to interact with cations in aqueous solution was investigated. At pH 7.0 the interfering elements can be selectively adsorbed within the capillaries without hampering the elution of Rh. The capillaries are easily regenerated by flushing with 10 -3 M hydrochloric acid in order to exchange retained cations for protons. Calibrations show no significant difference between the absence and presence of interfering elements, so the detection limit for Rh of 6.0 ng l -1 (3s) is not influenced by adding up to a 100-fold excess of interferents. The method developed is compared with a mathematical correction model for inductively coupled plasma mass spectrometry using the example of Rh determination in particulate car exhaust fumes and the results obtained are discussed.