Results of the U. S. Geological Survey's analytical evaluation program for standard reference samples distributed in April 2001

[摘要] This report presents the results of the U.S. Geological Survey's analytical evaluation program forsix standard reference samples -- T-165 (trace constituents), M-158 (major constituents), N-69(nutrient constituents), N-70 (nutrient constituents), P-36 (low ionic-strength constituents), andHg-32 (mercury) -- that were distributed in April 2001 to laboratories enrolled in the U.S.Geological Survey sponsored interlaboratory testing program. Analytical data received from 73laboratories were evaluated with respect to overall laboratory performance and relative laboratoryperformance for each analyte in the six reference samples. Results of these evaluations arepresented in tabular form. Also presented are tables and graphs summarizing the analytical dataprovided by each laboratory for each analyte in the six standard reference samples. The mostprobable value for each analyte was determined using nonparametric statistics.

[发布机构] U.S. Geological Survey

[学科分类] 地球科学(综合)