Quality-assurance data for routine water analysis in the laboratories of the US Geological Survey; 1981 annual report

The U.S. Geological Survey conducts an external blind sample qualityassurance project for its water-analysis laboratories in Denver, Colorado, and Ocala, Florida, based on the analysis of reference water samples. Reference samples containing selected inorganic and nutrient constituents are disguised as environmental samples and are sent periodically through Survey offices to each laboratory. The results of this blind sample project indicate the quality of analytical data produced by the laboratories. This report provides instructions for the use of QADATA, an interactive, menu-driven program that allows data users to retrieve the results of the blind sample quality-assurance project. The QADATA program, which is available through the U.S. Geological Survey's national computer network, accesses a blind sample data base that contains more than 50,000 determinations from the last five water years for approximately 40 constituents at various concentrations. The data can be retrieved from the database for any user-defined time period and for any or all available constituents. After the user defines the retrieval parameters, the program prepares statistical tables, control charts, and precision plots and generates a report which can be transferred to the user's office through the computer network. A discussion of the interpretation of the program output is also included in this report. This quality-assurance information will permit users to document the quality of the analytical results received from the laboratories. The blind sample data is entered into the database within weeks after being produced by the laboratories and can be retrieved to meet the needs of specific projects or programs.

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Quality-assurance data for routine water analysis in the laboratories of the US Geological Survey for water-year 1982

Peart¹,

Thomas²

1983

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Quality-assurance data for routine water analysis in the laboratories of the US Geological Survey; 1981 annual report

Cited by 4 publications

References 5 publications

Quality analysis of U.S. geological survey precipitation chemistry data for New York

Quality analysis of U.S. geological survey precipitation chemistry data for New York

QADATA user's manual; an interactive computer program for the retrieval and analysis of the results from the external blind sample quality- assurance project of the U.S. Geological Survey

Quality-assurance data for routine water analysis in the laboratories of the US Geological Survey for water-year 1982

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