Paper No. 96022 of the Journal of the American Water Resources Association (formerly Water Resources Bulletin). Discussions are open until October 1, 1997.
SAMPLING AND ANALYTICAL TOLERANCE REQUIREMENTS FOR DETECTING TRENDS IN WATER QUALITY†
Article first published online: 8 JUN 2007
JAWRA Journal of the American Water Resources Association
Volume 33, Issue 2, pages 367–373, April 1997
How to Cite
McBride, G. B. and Smith, D. G. (1997), SAMPLING AND ANALYTICAL TOLERANCE REQUIREMENTS FOR DETECTING TRENDS IN WATER QUALITY. JAWRA Journal of the American Water Resources Association, 33: 367–373. doi: 10.1111/j.1752-1688.1997.tb03516.x
- Issue published online: 8 JUN 2007
- Article first published online: 8 JUN 2007
- water quality;
- trend detection;
- tolerance requirements
ABSTRACT: In designing a water quality sampling program, the detection threshold (equivalent to “effect size” in a power analysis) can be calculated as a function of the Type I and II error risks, sampling frequency and duration, and (if appropriate) autocorrelation. Then the impact of sampling and analytical errors on the trend that can be detected within that threshold should be considered. A procedure for doing so is described, enabling a priori prescription to laboratory and field staff of the analytical tolerances expected of them in their work. It assumes that the trend (a linear or step change) can be described by a parametric model.