Rb - Rubidium

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Element CCRMP
Material		 Concen-
tration		 Units Classification*
Rb SO-3 39 µg/g Certified
Rb SY-4 55 µg/g Certified
Rb WPR-1 5 µg/g Provisional
Rb WGB-1 19.5 µg/g Provisional
Rb TDB-1 23 µg/g Provisional
Rb LKSD-1 24 µg/g Provisional
Rb LKSD-4 28 µg/g Provisional
Rb STSD-1 30 µg/g Provisional
Rb STSD-4 39 µg/g Provisional
Rb TILL-1 44 µg/g Provisional
Rb TILL-3 55 µg/g Provisional
Rb STSD-3 68 µg/g Provisional
Rb LKSD-3 78 µg/g Provisional
Rb LKSD-2 85 µg/g Provisional
Rb TILL-2 143 µg/g Provisional
Rb TILL-4 161 µg/g Provisional
Rb WMS-1a 3 µg/g Informational
Rb RTS-3a 13 µg/g Informational
Rb SU-1b 13 µg/g Informational
Rb FER-4 16 µg/g Informational
Rb HV-2 43.1 µg/g Informational
Rb FER-2 66 µg/g Informational
Rb CH-4 79 µg/g Informational
Rb MA-2c 147 µg/g Informational
Rb MA-1b 160 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.