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Results of the U.S. Geological Survey's Analytical Evaluation Program for standard reference samples distributed in March 1999

Open-File Report 99-259
By:  and 
https://doi.org/10.3133/ofr99259

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Abstract

This report presents the results of the U.S. Geological Survey's analytical evaluation program for 8 standard reference samples -- T-157 (trace constituents), M-150 (major constituents), N-61 (nutrient constituents), N-62 (nutrient constituents), P-32 (low ionic strength constituents), GWT-5 (ground-water trace constituents), GWM- 4 (ground-water major constituents),and Hg-28 (mercury) -- that were distributed in March 1999 to 120 laboratories enrolled in the U.S. Geological Survey sponsored interlaboratory testing program. Analytical data that were received from 111 of the laboratories were evaluated with respect to overall laboratory performance and relative laboratory performance for each analyte in the seven reference samples. Results of these evaluations are presented in tabular form. Also presented are tables and graphs summarizing the analytical data provided by each laboratory for each analyte in the 8 standard reference samples. The most probable value for each analyte was determined using nonparametric statistics.

Suggested Citation

Farrar, J.W., Chleboun, K.M., 1999, Results of the U.S. Geological Survey's Analytical Evaluation Program for standard reference samples distributed in March 1999: U.S. Geological Survey Open-File Report 99-259, iii, 166 p. : ill. ; 28 cm., https://doi.org/10.3133/ofr99259.

ISSN: 2331-1258 (online)

Publication type Report
Publication Subtype USGS Numbered Series
Title Results of the U.S. Geological Survey's Analytical Evaluation Program for standard reference samples distributed in March 1999
Series title Open-File Report
Series number 99-259
DOI 10.3133/ofr99259
Year Published 1999
Language ENGLISH
Contributing office(s) Standard Reference Sample Project- Branch of Quality Systems
Description iii, 166 p. : ill. ; 28 cm.
Additional publication details