This reference material is primarily intended for use in the calibration of procedures and the development of methods for the determination of trace metals in marine fauna and materials of similar matrix. This reference material was prepared from a fish protein homogenate. A uniform material was produced using an enzyme hydrolysis procedure subsequent to removal of the bones and the majority of the oil. The protein hydrolysate was spray dried, sieved to pass a 297 μm screen, blended and bottled. After bottling the material was sterilized by subjecting it to a minimum dose of 25 kGy gamma irradiation at the Canadian Irradiation Centre, Laval, Quebec. The predecessor CRM, DORM-3, has been periodically analyzed for more than nine years and found to be both physically and chemically stable over this time interval. We expect similar results for DORM-4. Uncertainty components for long and short term stability were considered negligible and are thus not included in the uncertainty budget. keywords: Biological material, Animal tissue, Foodstuff, Fish/Shellfish, Trace elements, Heavy metals, Speciation analysis, Mercury speciation
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