ABSTRACT

Pure Appl Chem 1990; 62(6):1193-1208. 8. Horwitz W. ‘‘Problems of samplings and analytical methods.’’ IUPAC, J Assoc

Off Anal Chem 1976; 59(6):1197-1203. 9. Horwitz W. ‘‘Design, conduct and interpretation of method performance stu-

dies.’’ IUPAC, Protocol 1994. 10. Kateman G, Buydens L. Quality Control in Analytical Chemistry. 2nd ed. New

York: Wiley, 1993. 11. Keith LH. Environmental Sampling and Analysis. A Practical Guide. Chelsea.