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Calibration, Check Standards and Quality Control

Last revised July 22, 1997
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Page contents: (click to skip down)

* [General quality assurance policy]
* [Mass spectrometry samples]
* [Plant/soil total C, total N]
* [Samples for colorimetry]
* [Samples for atomic absorption spectrophotometry]

General quality assurance policy

Detailed information is given below on the methods used by this laboratory to ensure the accuracy of its analyses. Where U.S. E.P.A.-certified analytical methods exist for a given analyte, they are used (these are called out in the methods for each particular analyte.)

* [Nitrogen, Nitrate-Nitrite. EPA Method 353.2]
* [Nitrogen, Ammonia. EPA Method 350.1]
* [Phosphorus, All Forms. EPA Method 365.1]
* [Calcium: EPA Method 215.1]
* [Magnesium: EPA Method 242.1]
* [Potassium: EPA Method 258.1]

In general we feel that quality control of our sample analyses is our responsibility, while quality control of any given research project is the investigator's responsibility. If an adequate system of quality control is not built into a project from the beginning, including field replicates, field blanks, split samples and so on, we cannot provide it. The following sources may aid investigators in preparing quality control strategies for their projects:

Allen, S. E., et al. 1974.
Analysis of soils: sample collection and initial treatment pp.13ff. In Chemical Analysis of Ecological Materials. John Wiley and Sons, New York USA.
Allen, S. E., et al. 1974.
Analysis of vegetation and similar materials: sample collection and initial treatment. pp. 71ff. In Chemical Analysis of Ecological Materials. John Wiley and Sons, New York USA.
American Public Health Association. 1992.
Collection and preservation of samples. pp.1-18 -- 1-23. In Standard Methods for the Examination of Water and Wastewater. American Public Health Association, Washington, DC USA.
James, D. W. and K. L. Wells. 1990.
Soil sample collection and handling. pp.25-44. In R. L. Westerman, ed., Soil Testing and Plant Analysis. Third ed. Soil Science Society of America, Madison, WI USA.
Peterson, R. G. and L. D. Calvin. 1986.
Sampling. pp.33-51. In A. L. Page et al., eds., Methods of Soil Analysis: Part 2, Chemical and Microbiological Properties. Agronomy, A Series of Monographs, no.9 pt.2, Soil Science Society of America, Madison, Wisconsin USA.
U. S. Environmental Protection Agency. 1979.
Handbook for Analytical Quality Control in Water and Wastewater Laboratories. EPA-600/4-79-019. U.S. E.P.A., Cincinnatti, Ohio USA.
U. S. Environmental Protection Agency. 1983.
Sample preservation. pp. xv-xx. In Methods for Chemical Analysis of Water and Wastes. EPA-600/4-79-020. U.S.E.P.A., Cincinnati, Ohio, USA.

(Icon) Stable isotope analysis of 13C and 15N


(Icon) Micro-Dumas analysis for total C and total N


(Icon) Samples for colorimetric analysis


(Icon) Samples for atomic absorption spectrophotometry


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