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I make this enquiry for our study group concerning QC material for the microwave digestion procedure. We plan to use this technique for extraction of trace metals e.g. Hg from facial creams. Any advise from the Group for the source of such a QC material is much appreciated. Robert Cheung Ph.D. Chemical Pathology Prince of Wales Hospital Shatin, Hong Kong email: [log in to unmask] %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%