Analysis of geoporphyrins by high-temperature gas chromatography inductively coupled plasma mass spectrometry and high-performance liquid chromatography inductively coupled plasma mass spectrometry. Plenary lecture

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Abstract
High-temperature gas chromatography (HTGC) and high-performance liquid chromatography (HPLC) have been coupled to inductively coupled plasma mass spectrometry (ICP-MS) for the determination of geopophyrins from oils shales. A New, directly heated stainless-steel capillary interface was used to introduce the eluent into the ICP torch. The interface was robust, simple to install, programmable and introduced minimal loss (5–10%) in chromatographic efficiency. The HTGC–ICP-MS was used for rapid metal fingerprinting of the geoporphyrin fractions. Cobalt, Chromium, iron, nickel, titanium, vanadium and zinc metalloporphyrins were fingerprinted. For quantitative analysis HPLC–ICP-MS was preferred. Quantitative data obtained by HPLC–ICP-MS and HPLC with UV absorption detection of nickel geoporphyrins from Julia Creek and Serpiano oil shales showed good agreement. Levels of nickel porphyrins were in the range 15–120 µg g–1 in the samples analysed. The potential for multi-element, multi-isotopic detection is clearly illustrated using up to ten elements/isotopes virtually simultaneously.

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