U.S. Geological Survey Certificate of Analysis
Manganese Nodule, NOD-A-1
NOD-A-1 is a reference material which can be used to establish analytical accuracy in the analysis of manganese nodules or other geologic samples with elevated manganese concentrations. Material used in the preparation of the standard was collected from the Atlantic ocean along the Blake Plateau (31° 02' N, 78° 22' W) at a depth of 788 meters (Flanagan and Gottfried, 1980).
Recommended concentrations for elements and oxides are reported when results from USGS interlaboratory studies (Flanagan and Gottfried, 1980) using independent methods of analysis are in statistical agreement. Supplemental information derived from international data compilations (Abbey, 1983, Govindaraju, 1994) is also provided.
Information concentrations are given when results are based on analyses obtained using a single technique or when data from different procedures are not in statistical agreement.
|Oxide||Wt %||±||Oxide||Wt %||±|
revised March 1995
David B. Smith
Central Region Mineral Resources Team (formerly Branch of Geochemistry)
Abbey, S., 1983, Studies in "Standard Samples" of Silicate Rocks and Minerals 1969-1982: Canadian Geological Survey paper 83-15, p. 114.
Flanagan, F.J., and Gottfried, D., 1980, USGS Rock Standards, III: Manganese-Nodule Reference Samples USGS-NOD-A-1 and USGS-NOD-P-1: U.S. Geological Survey Professional Paper 1155, 39 p.
Govindaraju, K., 1994, 1994 Compilation of Working Values and Descriptions for 383 Geostandards: Geostandards Newsletter, 18:1-158.
|Fe2O3T||Total iron expressed as Fe2O3|
|Wt %||Percent of total element concentration|
|µg/g||Total element concentration expressed as micrograms of element per gram of solid sample|
|±||One standard deviation|
Prior to analysis samples of NOD-A-1 should be dried at 110°C for 24 hours. Samples should be stored in a desiccator if not used immediately. Reports indicate that NOD-A-1 can absorb up to 10% by weight of moisture when exposed overnight to air.
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.
Beginning in 2006, users of USGS geochemical reference materials must complete a user agreement form prior to the order being processed. This agreement is required by the USGS Technology Transfer Office for complying with the United States Economy Act, 31 USC 1535A.
Please download the agreement form and follow the instructions on the form when placing your order.