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產(chǎn)品詳細介紹

IAEA-461蛤蜊/蚌/厚殼縱簾蛤Clam (Gafrarium tumidum)

Sixty kg of clams (Gafrarium tumidum) were collected in Noumea, New Caledonia. Clams were
opened, the soft-shell part was frozen and then freeze dried. The dry material was first ground and
sieved at 250 μm. A portion of about 5 kg was micronized to achieve a final powder size <50 μm. The
homogenization was performed by mixing the material in a stainless steel rotating homogenizer
Moritz ERM-BB124 (Moritz, Chatou, France) for 14 days at a temperature of 20 (±2)°C and relative
humidity of 50%. After checking for the homogeneity of sample material, aliquots of about 8 g were
packed into pre-cleaned brown borosilicate glass bottles with polyethylene caps and then sealed in
plastic bags. The sample material was labelled as IAEA-461.

(a) Information on calculation of certified values Certified values are calculated from the accepted data sets, each set being obtained by a different laboratory and/or a different method of determination following ISO Guide 35 ‘Reference materials – General and statistical principles for certification’ [1].
(b) Information on method used for uncertainty estimation The uncertainty is expressed as a combined uncertainty with a coverage factor k = 2, corresponding to a level of probability 95% , estimated in accordance with the JCGM 100:2008 ‘Evaluation of measurement data – Guide to the expression of uncertainty in measurement’ [2] and ISO Guide 35 [1].