Water quality; Determination of free chlorine and total chlorine; Part 2 : Colorimetric method using N,N-diethyl-1,4-phenylenediamine, for routine control purposes— 12 стр.
BS EN 12566-3. Small wastewater treatment systems for up to 50 PT. Part 3. Packaged and/or site assembled domestic wastewater treatment plants— 88 стр.
Water quality. Physical, chemical and biochemical methods, Determination of biochemical oxygen demand after 5 days (BOD$d5): dilution and seeding methods— 14 стр.