Gd - Gadolinium

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Element CCRMP
Material
Concen-
tration
Units Classification*
Gd SY-4 14 µg/g Certified
Gd WPR-1 0.9 µg/g Provisional
Gd2O3 OKA-2 0.58 % Provisional
Gd WMS-1a 0.8 µg/g Informational
Gd HV-2 1.4 µg/g Informational
Gd SU-1b 2 µg/g Informational
Gd WGB-1 2.5-3.5 µg/g Informational
Gd CH-4 3 µg/g Informational
Gd (T) GTS-2a 6.3 ug/g Informational
Gd TDB-1 7 µg/g Informational
Gd MA-2c 9.58 µg/g Informational

*Classification of the results by level of agreement

All concentration values are derived from an interlaboratory measurement program. Samples are sent to many laboratories, typically twenty to forty, and the results are analyzed statistically to determine the mean and other statistical parameters.

Certified: The value is calculated from a minimum of 10 sets of data that fulfill specific statistical criteria regarding agreement.

Provisional: The value is calculated from 8 or 9 sets of data that fulfill specific statistical criteria regarding agreement; or alternatively, more than 9 sets of data that do not fulfill the specific statistical criteria required for certification.

Informational: The value is calculated from 7 or fewer sets of data.

Note: Because of different digestion methods used, a single material may show different concentrations for a specific element. Details about methods are provided on the certificate and in the report.