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2. AOAC, P. Cunniff (Ed.), Official Methods of Analysis of the Association of Official Analytical Chemists International, 16th ed., Ass. Offic. Anal. Chem. Intern., Arlington, VA, 1995, Chap. 11, pp. 20–21
3. APHA, A.D. Eaton, L.S. Clesceri, A.E. Greenberg (Eds.), Standard Methods for the Examination of Water and Wastewater, 19th ed., American Public Health Association, Washington DC, 1995, Chap. 4, pp. 106–115
4. ASTM, Annual Book of ASTM Standards, American Society for Testing and Materials, Section 11–Water and Environmental Technology, Vol. 11.01, Water, West Conshohocken, PA, 1996, pp. 24–31