Extraction of heavy metal complexes from a biofilm colony for biomonitoring the pollution

An extraction method was tested for biomonitoring the biofilm samples containing heavy metals. Thefractionation of metal complexes was performed via C-18-HPLC-ICP-MS and MALDI-MS, respectively. The extractionpower of some reagents was determined for the heavy metal extraction from biofilm samples collected in Erdemli coastin the Mediterranean Sea. The ammonium acetate solution giving the highest extraction results was found as a suitableextraction reagent. The concentration and pH of the ammonium acetate solution were optimized and found as 1 M and 5,respectively. The chromatograms of metal complexes with the C-18-HPLC-ICP-MS system were taken to determine theeffect of the pH of the metal complexes. After performing the extraction, metal bounded biomolecules were characterizedby MALDI-MS for the fractions in the C18-HPLC system. It was seen that ammonium acetate extraction (1M, pH 5)might be used in biomonitoring studies due to relatively simple procedure, short analysis period, and low cost. Theevaluation of the applicability of the method in biomonitoring studies might be supported by further studies withbiofilms having similar characteristics.

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