Abstract
Commercial filament-type pyrolysis apparatus (CDS 100–382) directly interfaced to a Finnigan 4000 mass spectrometer (INCOS data system) was used to investigate processes relevant to the direct graphite furnace atomic absorption spectroscopic determination of trace metals in seawater with the aid of organic “releasing agents”. The temperature of the pyrolyzer filament was programmed so the pyrolysis—mass spectrometry experiments would be analogous to the GFAAS operation. Rapid mass spectrometer scans ( < 0.5 s) allowed temporal resolution of pyrolysis reactions. Chemical ionization (Ar, He, i-butane; positive, negative) and electron impact ionization were used. Systems studied included those relevant to the direct determination of Zn and Cd in seawater, using citric acid and EDTA as releasing agents. Analytical sensitivities for determinations of trace metals in seawater by pyrolysis—mass spectrometry were assessed with the aid of GFAAS.
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