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32 Mass SpectrometricMethods for Trace Analysis of Metals These results clearly demonstrate that FDMS, in conjunction with a multichannel analyzer, represents a powerful method for the trace analysis of metals. Obviously, the unavoidable statistical fluctuations in the FD ion currents have lost their detrimental effect on the FD assay and the signal-to-noise ratio of the signals in question has been improved considerably by spectra accumulation. In addition, it can be expected that by use of the isotope dilution technique quantitative determinations of high sensitivity and accuracy can be accomplished without prior treatment of the original biological or environmental sample.

It is evident from these results that FDMS using photographic detection has a considerable advantage over most other analytical techniques of giving direct information on metal cations and intact inorganic salts present in the aerosol. g. single cations, or molecules M and clusters of n molecules, bearing an additional cation, of the general formula (n × M + cation). In addition, airborne, organic material of low volatility can also be analyzed by this technique. 30 Mass Spectrometric Methods for Trace Analysis of Metals Table 6.

5 % of fetal malformations. If this were transformed to humans it would mean that an oral dosage of ca. 10 microgram of thallium (per kg body weight) at the time of formation of the extremities and organs in the embryo would result in a significant enhancement of malformations. Consecutively, a quantitative measurement of the time dependent thallium distribution in organs of mice by FDMS 78"90) was performed'. The results of this recent investigation can be summarized as follows. 5,10-3 I 10-3 I O !

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