Application of an economical and small thermal ionization mass spectrometer for accurate anion trace analyses

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書誌事項

公開日
1985-01
権利情報
  • http://www.springer.com/tdm
DOI
  • 10.1007/bf00479812
公開者
Springer Science and Business Media LLC

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説明

Isotope dilution mass spectrometry as a definitive method is preferably used for both calibration of routine methods and for analyses with high accuracy requirements. So far, the isotope dilutionn technique has been applied only in a few cases in spite of the great advantages of this method. This was due to the fact that only large magnetic sector field mass spectrometers have been commercially available for this application. These instruments are primarily designed for high precision isotope ratio measurements. Therefore, a small, cost-efficient and easy-to-use quadrupole thermal ionization mass spectrometer was developed. This instrument's precision of the isotope ratio measurement is suitable to fit the needs of the isotope dilution technique in particular. The new mass spectrometer can produce and analyse positive thermal ions for metal analysis as well as negative thermal ions for anion analysis. A review on the developed isotope dilution techniques for anion determinations and on the elements which are potentially determinable is given. The principle of this method is described, using the chloride analysis as an example. Isotope ratio measurements are carried out in a direct comparison between the new quadrupole instrument and a magnetic sector field mass spectrometer, using borate, chloride, bromide and iodide samples. Additionally, the boron trace content in different materials and the iodine content in food samples is determined. The relative standard deviations of isotope ratio measurements are 0.2–0.6% for the quadrupole and 0.1–0.2% for the magnetic mass spectrometer. Considering the limits of error the results of isotope dilution analyses are identical for both instruments.

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