PRELIMINARY - U.S. Geological Survey Certificate of Analysis
Basalt, Columbia River, BCR-2
Material used in the preparation of BCR-2 was collected in 1996 from the Bridal Veil Flow Quarry under the direction of Stephen A. Wilson, U.S. Geological Survey. The quarry, located approximately 29 miles east of Portland, Oregon, is the same collection site used to provide material for BCR-1.
Element concentrations were determined in a round-robin study involving 20 international laboratories. Recommended total element concentrations are reported when analytical results provided by three independent laboratories using a minimum of three independent analytical procedures are in statistical agreement. Information values with standard deviations are provided when two or more independent laboratories using at least two independent analytical procedures have provided information. Information values without standard deviations represent information from a single laboratory or analytical procedure.
|Element||Wt %||±||Oxide||Wt %||±|
Dr. Geoff Plumlee
U.S. Geological Survey
Central Region Mineral Resources Team
Wilson, S.A., 1997, The collection, preparation, and testing of USGS reference material BCR-2, Columbia River, Basalt: U.S. Geological Survey Open-File Report 98-xxx.
|Wt %||Percent of total element concentration|
|µg/g||Total element concentration expressed as micrograms of element per gram of solid sample|
|±||One standard deviation|
|N||Number of labs reporting|
Order and Pricing Information
Placing an Order
USGS reference materials may be obtained directly from Dr. Stephen A. Wilson. The price for each reference material is listed in U.S. dollars and are subject to change. For domestic orders, this cost includes all shipping and handling charges using normal mail delivery by the U.S. Postal Service. For foreign orders, delivery charges will be added to the final bill. Urgent requests for reference materials should be initiated by Fax or e-mail. If required, expedited delivery is available with any additional shipping charges added to the final bill.
Dr. Stephen A. Wilson
U.S. Geological Survey
Box 25046, MS 964D
Denver, CO 80225
FAX: 303-236-3200 or 303-236-1425
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Payments for domestic or international orders using a credit card receive a 10% discount on the per bottle price.
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Please download the agreement form and follow the instructions on the form when placing your order.