U.S. Geological Survey Geochemical Reference Materials and Certificates
U.S. Geological Survey
Certificate of Analysis
The medium volatile bituminous coal used in the preparation of this USGS reference material was collected in 1982 from the Lower Bakerstown coal bed under the direction of Paul C. Lyons. All values are reported on a whole coal basis.
Recommended Element Concentrations are derived using at least three independent methods of analysis from a minimum of two independent laboratories. Statistical treatment of the data uses the procedures outlined in previous USGS publications (Kane et al. 1990).
Information values are presented when less than three independent methods of analysis were used to determine the final concentration. Standard deviations are provided when at least three independent laboratories reported values in statistical agreement.
Recommended Values | Information Values | Bibliography | Glossary | Notes | Order and Pricing Information
| Oxide | Wt% | ± | Oxide | µg/g | ± | |
|---|---|---|---|---|---|---|
| Fe2O3 | 1.25 | 0.05 | MgO | 470 | 30 | |
| CaO | 0.22 | 0.01 | Na2O | 230 | 22 | |
| K2O | 760 | 50 | ||||
| Element | µg/g | ± | Element | µg/g | ± | |
|---|---|---|---|---|---|---|
| Ba | 34 | 5 | Pb | 5.1 | 0.7 | |
| Ce | 10 | 1.6 | Rb | 5.2 | 0.9 | |
| Co | 7.0 | 0.7 | Sc | 2.0 | 0.1 | |
| Cr | 9.7 | 1.2 | V | 12 | 1 | |
| Ni | 18 | 2 | Zn | 48 | 4 |
| Major Component | Wt % | ± | Oxide | µg/g | ± | |
|---|---|---|---|---|---|---|
| Al2O3 | 1.51 | 0.04 | P2O5 | 700 | 100 | |
| SiO2 | 2.51 | 0.21 | TiO2 | 780 | 30 | |
| Stot | 1.49 | 0.09 | ||||
| Ash | 6.3 | 0.1 | ||||
| Element | µg/g | Element | µg/g | |
|---|---|---|---|---|
| As | 13 | Mo | 9 | |
| Cu | 10 | Nb | 1 | |
| Ga | 3 | Nd | 5 | |
| Hg | 0.2 | Sb | 1.5 | |
| La | 5 | Se | 2 | |
| Li | 8 | Th | 1.4 | |
| Mn | 8 | U | 0.55 |
Wilson, S.A. 1997, Certificate of Analysis Coal, Lower Bakerstown CLB-1, U.S. Geological Survey Open-File Report 97-299, p 1.
| Symbol | Definition |
|---|---|
| Fe2O3T | Total iron concentration expressed as Fe2O3 |
| Stot | Total sulfur concentration |
| Wt % | Percent of total element concentration |
| µg/g | Total element concentration exressed as micrograms of element per gram of solid sample |
| ± | One standard deviation |
Unless indicated total element concentrations are reported for material on an as-received basis.
USGS reference materials (RMs) may be obtained directly from Dr. Stephen A. Wilson. The price for each bottle of RM is $80.00 (U.S. dollars) except DGPM-1, which is $175.00 (U.S. dollars). For domestic orders, this cost includes all shipping and handling charges using normal mail delivery. For foreign orders, delivery charges will be added to the final bill. Urgent requests for RMs should be initiated by Fax or e-mail. If required, overnight delivery is available with these charges added to the final bill.
Dr. Stephen A. Wilson
U.S. Geological Survey
Box 25046, MS 964
Denver, CO 80225
Tel: 303-236-2454
FAX: 303-236-3200 or 303-236-1425
e-mail: (wilson)
Domestic customers: Payment options include purchase order, check, money order, or credit card (Visa, Mastercard).
International customers: Payment on foreign orders can only be made using the following:
Payments for domestic or international orders using a credit card receive a 10% discount on the per bottle price.
Beginning in 2006, users of USGS geochemical reference standards must complete a user agreement form prior to the order being purchased.
User agreement for domestic users: Word format, 56 KB and PDF format, 24 KB.
User agreement for foreign users: Word format, 56 KB and PDF format, 28 KB.
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