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  • Inorganic and organic arsenic compounds in Slovenian mushrooms : comparison of arsenic specific detectors for liquid chromatography
    Slekovec, Metka ; Goessler, W. ; Irgolič, K.J.
    After separation of arsenite, dimethylarsinic acid, methylarsonic acid, and arsenate on an Hamilton PRP-X 100 anion-exchange column, arsenic compounds were detected with flame atomic absorption ... spectrometry (FAAS), graphite furnace atomic absorption spectrometry (GFAAS) or inductively coupled plasma mass spectrometry (ICP-MS). With HPLC-ICP-MS system 0,1 ng of arsenic with a relative standard deviation of 10% could be quantified. The HPLC-FAAS and HPLC-GFAAS require at last three erders of magnitude more arsenic to be reliably quantified. The applicability of the three arsenic-specific detectorswas tested with aqueous extracts of mushrooms Laccaria amethystina (~26 mg As/kg dry mass), Laccaria laccata (~26 and ~32 mg As/kg dry mass), Boletus cavipes (~12 mg As/kg dry mass), and Thelephora terrestris (~38 mg As/kg dry mass) collected in unpolluted areas in Slovenia. The detection limits abtained with HPLC-FAAS were found to be to high to be used to quantifythe arsenic compounds in the aqueous extracts of mushrooms from uncontaminated sites. In the Laccaria amethystina, 97% of the arsenic was found to be dimethylarsinic acid and 3% arsenite. In the related Laccaria laccata, the predominant arsenic compound was arsenate (~80%) and the minor arsenic compounds were arsenite (~14%), and dimethylarsinic acid (~3%). In theThelephora terrestris, an inedible mushroom with woody structure, only inorganic arsenic compounds were determined (~70% arsenite and ~30% arsenate). In the Boletus cavipes, 50% of arsenic was found to be arsenate, 40% arsenite, and the form of dimethylarsinic acid. The quantitative results for the four mushrooms obtained with two systems agree reasonably when the concentrations in the extracts are sufficiently high. Minor arsenic compounds could only be detected with HPLC-ICP-MS.
    Vir: Chemical speciation and bioavailability. - ISSN 0954-2299 (11, No. 4, 1999, str. 115-123)
    Vrsta gradiva - članek, sestavni del
    Leto - 1999
    Jezik - angleški
    COBISS.SI-ID - 1647916

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