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GC-MS, gas chromatography - mass spectrometry; ICP-MS, inductively coupled plasma – mass spectrometry; ID-ICP-MS: isotope dilution inductively coupled plasma – mass spectrometry; INAA, instrumental neutron activation analysis; LC-MS, liquid chromatography - mass spectrometry. 
The uncertainty attached to the certified values is the expanded uncertainty using a coverage factor k=2, corresponding to a confidence interval of approximately 95 %. 
All certified values were determined based on dry mass.

The property values of the material were statistically determined based on chemical analyses by 21 organizations using a wide range of methods. A property value satisfying the following conditions was accepted as a certified value: 1) the relative standard deviation associated with the mean of the laboratory means was 5 % or less; 2) the number of laboratories contributing to the mean of the laboratory means was at least six; 3) the number of methods contributing to the mean of the laboratory means was at least two. The uncertainty attached to the certified values is the expanded uncertainty using a coverage factor k=2, corresponding to a confidence interval of approximately 95 %. Property values for the elements except tin are given as reference values. All certified and reference values were determined based on dry mass.

AS, absorption spectrophotometry; F-AAS, furnace atomic absorption spectrometry; HR-ICP-MS, high resolution inductively coupled plasma – mass spectrometry; ICP-AES, inductively coupled plasma – atomic emission spectrometry; ICP-MS, inductively coupled plasma – mass spectrometry; INAA, instrumental neutron activation analysis; MIP-MS, microwave induced plasma mass spectrometry; XRF, X-ray fluorescence spectrometry. 
All reference values were determined based on dry mass.

The material consists of freeze dried and powdered adductor muscle of scallop (20 g) in a vacuum-packed in a plastic bag.

TBT, TPT, and the elements were determined in material taken from 10 bags randomly selected from the 1380 bags, using LC-MS, ICP-AES, or ICP-MS. The between-bottle variation evaluated by a one-way analysis of variance (ANOVA) showed the relative standard deviations between bags for the analytes to be less than 1 %. The material, therefore, is sufficiently homogeneous for its intended use as a reference material.