title: Valuation of characteristics of water purity. I. Estimation of the usefulness of some microbiological and hydrobiological characteristics.
abstract: The titres of physiological processes in bacteria (hydrolysis of urea, nitrification), total number of bacteria and photosynthesis were found to show high correlation with standard characteristics: BOD5 and saprobic index. The classificatory values of BOD5 and saprobic index depend on the pollution of waters (with BOD5 less than 3 mg O2/l more information on the extent of pollution is given by the saprobic index whereas with higher values BOD5 is better). The content of NH3-N and titres of ammonification and H2S production depend on the type of pollution and should not be used for determination of water purity without additional studies. Of increasing importance as a measure of pollution is the BOD5/BOD2 quotient.
mesh_terms: D000641:Ammonia / Q000378:metabolism; D001419:Bacteria / Q000302:isolation & purification* / Q000378:metabolism; D056890:Eukaryota / Q000302:isolation & purification / Q000378:metabolism; D006862:Hydrogen Sulfide / Q000378:metabolism; D006868:Hydrolysis; D009573:Nitrites / Q000378:metabolism; D010100:Oxygen / Q000378:metabolism*; D010788:Photosynthesis; D014508:Urea / Q000378:metabolism; D014871:Water Microbiology; D014876:Water Pollution / Q000032:analysis*
chemical_list: D009573:Nitrites; D000641:Ammonia; D014508:Urea; D010100:Oxygen; D006862:Hydrogen Sulfide