[Effect on the respiration of bacteria in microcosm by the disinfectant of chlorine].
OBJECTIVE
To observe respiratory volume of bacteria as the physiology activity index to evaluate the effect of sodium hypochlorite (NaClO) on the microenvironment.


METHODS
The water and soil from Wuhan Muoshui Lake were selected as research object. Man-made microcosms were designed and constructed. The sodium hypochlorite was put into the microcosms every 24 hour for 13 days. The bacteria respiratory volume and the general bacterial population were observed.


RESULTS
The results showed that the bacteria in the low-dose disinfectant were stimulated and its respiration volumes were increased in the beginning of the experiment. But several days later, the bacteria were inhibited or killed predominantly which led to the decrease of its respiration volumes. In high-dose group, the bacteria were killed obviously in the beginning and their respiration volumes decreased immediately. After the disinfectant was given up, the respiratory volume resumed gradually to the initial condition. This change process accorded with the general bacterial population as a whole. The respiratory volume of bacteria was related with the dose of disinfectant.


CONCLUSIONS
The change of the respiratory volume of bacteria was related with the dose of sodium hypochlorite. The disinfectant effect on the metabolic activity of microorganism would be lighter if it under the dose 10 mg/L.
Lu
Yi
Y
Institute of Environmental Medicine, School of Public Health, Tongji Medical College, Huazhong University of Science & Technology, MOE Key Lab of Environmental Health, Wuhan 430030, China.
Wang
Ying
Y
Ren
Lijun
L
Wang
Lin
L
D001419:Bacteria / Q000187:drug effects* / Q000378:metabolism*; D015169:Colony Count, Microbial; D004202:Disinfectants / Q000494:pharmacology*; D012973:Sodium Hypochlorite / Q000494:pharmacology*
D004202:Disinfectants; D012973:Sodium Hypochlorite