... University of Alberta Quality Assurance for Sampling Many sampling errors can be eliminated or minimized by an appropriate quality- assurance program (Ref 19). Quality control may be achieved ... material to the top is sometimes effective. References cited in this section 14. J.K. Taylor, Quality Assurance of Chemical Measurements, Anal. Chem., Vol 53, 1981, p 1588A-1595A 15. C.A. Bicking, ... Kolthoff and P.J. Elving, Ed., John Wiley & Sons, 1979, p 299-359 19. J.K. Taylor, Principles of Quality Assurance, NBSIR 85-3105, National Bureau of Standards, Gaithersburg, MD, 1985 20. G.E.F....