1. 3) W. J. Williams: "Handbookof Anion Determination", p. 379 (1979), (Butterworths).
2. 7) American Public Health Association, American Water Works Association, Water Environment Federation: "Standard Methods for the Examination of Water and Wastewater", 20th Ed., p. 4 (1998).
3. 8) ISO 7393-1: Water Quality-Determination of free chlorine and total chlorine•Titrimetric method using N,N-diethyl-1,4-phenylenediamine, (1985).
4. 10) ISO 7393-2, Water Quality-Determination of free chlorine and total chlorine•Colorimetric method using N,N-diethyl-1,4-phenylenediamine for routine controle purposes (1985).
5. 12) R. Bauer, C. O. Rupe: Anal. Chem., 43, 421 (1971).