Quality Control in Routine Instrumental Epithermal Neutron Activation Analysis of Geological Samples

Figure 3. Expected configurations of Youden two-sample charts for lognormal data. [I] Liteanu, C., and Rica, I., Statistical Theory and Methodology of Trace Analysis, Halsted Press, New York, p. 31 (1980). [2] Aitchison, J., and Brown, J. A. C., The Lognormal Distribution, Cambridge University Press, London (1957). [3] Deming, W. E., Quality, Productivity and Competitive Position, Massachusetts Institute of Technology, Cambridge, p. 119 (1982). [4] ACS Committee on Environmental Improvement, Anal. Chem. 55, 2210 (1983). [5] Youden, W. J., and Steiner, E. H., Statistical Manual of the AOAC, Association of Official Analytical Chemists, Arlington, p. 8 (1975). [6] Eckschlager, K., and Stepanek, V., Analytical Measurement and Information, John Wiley and Sons, New York, p. 73 (1985). [7] Thompson, M., and Howarth, R. J., Analyst 105, 1188 (1980). [8] Horwitz, W., J. Assoc. Official Anal. Chem. 66, 1295 (1983). [9] Eckschlager, K., Errors, Measurement and Results in Chemical Analysis, Van Nostrand Reinhold, London, p. 72 (1969). [10] Janardan, K. G., and Schaeffer, D. J., Anal. Chem. 51, 1024 (1979). [11] Environmental Protection Agency, Guidelines Establishing Test Procedures for the Analysis of Pollutants, Federal Register, 44, 69464-69575 (3 Dec. 1979). [12] Provost, L. P., and Elder, R. S., Statistical Issues in QC for Trace Analysis, presented at 28th Annual Fall Technical Conference, London, Ontario (1984). [13] Horwitz, W., and Albert, R., private communication (1985).