TCVN 6664-2000 Water quality..Evaluation in an aqueous medium of the ultimate aerobic biodegradability of organic compounds.Determination of biochemical oxygen demand in a two-phase closed bottle test
2008TCVN 6664-2000 Water quality..Evaluation in an aqueous medium of the ultimate aerobic biodegradability of organic compounds.Determination of biochemical oxygen demand in a two-phase closed bottle test