U.S. Geological Survey Geochemical Reference Materials and Certificates
PRELIMINARY
U.S. Geological Survey
Certificate of Analysis
Material used in the preparation of AGV-2 was collected from the eastern side of Guano Valley, in Lake County, Oregon. This is the same location used to provide material for AGV-1. Information on the mineralogy and classification of AGV-2 is unavailable but it is assumed to be very similar to AGV-1 (Flanagan, 1967, 1969). Element concentrations for AGV-2 were obtained through a round robin study involving 23 international laboratories.
Element concentrations are recommended, if results from three of more independent laboratories using three or more independent analytical procedures are in statistical agreement. Information values with standard deviations are reported when three 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. All isotopic information is from a single laboratory.
Recommended Values | Information Values | Certificate Information | Bibliography | Glossary | Order and Pricing Information
| Element | Wt % | ± | Oxide | Wt % | ± | |
|---|---|---|---|---|---|---|
| Al | 8.95 | 0.11 | Al2O3 | 16.91 | 0.21 | |
| Ca | 3.72 | 0.09 | CaO | 5.20 | 0.13 | |
| Fe | 4.68 | 0.09 | Fe2O3 | 6.69 | 0.13 | |
| K | 2.39 | 0.09 | K2O | 2.88 | 0.11 | |
| Mg | 1.08 | 0.02 | MgO | 1.79 | 0.03 | |
| Na | 3.11 | 0.09 | Na2O | 4.19 | 0.13 | |
| P | 0.21 | 0.01 | P2O5 | 0.48 | 0.02 | |
| Si | 27.7 | 0.35 | SiO2 | 59.3 | 0.7 | |
| Ti | 0.63 | 0.13 | TiO2 | 1.05 | 0.22 |
| Element | µg/g | ± | Element | µg/g | ± | |
|---|---|---|---|---|---|---|
| Ba | 1140 | 32 | Pb | 13 | 1 | |
| Be | 2.3 | 0.4 | Pr | 8.3 | 0.6 | |
| Ce | 68 | 3 | Rb | 68.6 | 2.3 | |
| Co | 16 | 1 | Sc | 13 | 1 | |
| Cr | 17 | 2 | Sr | 658 | 17 | |
| Cu | 53 | 4 | Th | 6.1 | 0.6 | |
| Dy | 3.6 | 0.2 | U | 1.88 | 0.16 | |
| Gd | 20 | 1 | V | 120 | 5 | |
| La | 38 | 1 | Y | 20 | 1 | |
| Mn | 770 | 20 | Yb | 1.6 | 0.2 | |
| Nb | 15 | 1 | Zn | 86 | 8 | |
| Nd | 30 | 2 | Zr | 230 | 4 | |
| Ni | 19 | 3 | ||||
| Element | µg/g | ± | Element | µg/g | ± | |
|---|---|---|---|---|---|---|
| Cs | 1.16 | 0.08 | Lu | 0.25 | 0.01 | |
| Er | 1.79 | 0.11 | Sb | 0.6 | ||
| Eu | 1.54 | 0.10 | Sm | 5.7 | 0.3 | |
| F | 440 | Sn | 2.3 | 0.4 | ||
| Gd | 4.69 | 0.26 | Ta | 0.89 | 0.08 | |
| Hf | 5.08 | 0.20 | Tb | 0.64 | 0.04 | |
| Ho | 0.71 | 0.08 | Tl | 0.27 | ||
| Li | 11 | Tm | 0.26 | 0.02 |
| Element | Isotopic Ratios | ± | N |
|---|---|---|---|
| Pb 206/204 | 18.864 | 0.007 | 1 |
| Pb 207/204 | 15.609 | 0.006 | 1 |
| Pb 208/204 | 38.511 | 0.020 | 1 |
Issued 4-30-98
Denver, Colorado
Dr. Geoff Plumlee
U.S. Geological Survey
Central Region Mineral Resources Team
Wilson, S.A., 1998, Data compilation and statistical analysis of intralaboratory results for AGV-2, U.S. Geological Survey Open-File Report (in progress).
| Symbol | Definition |
|---|---|
| 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 |
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: (swilson)
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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Page Last Modified: 12-Mar-2009@20:55
