摘要
目的研究酸性氧化电位水在保存过程中理化指标与消毒能力的变化,为其推广应用提供理论依据。方法在常温、封闭、不避光的保存条件下,在保存0、3、7、10、17、24、31、38、45、52、59、66d时,测定酸性氧化电位水的pH值、ORP、有效氯浓度及其作用20min时对枯草杆菌黑色变种芽孢(ATCC 9372)的消毒能力。结果酸性氧化电位水在保存过程中,pH值略有降低,由2.5下降至2.47;变化最大的指标是有效氯浓度,保存到10d,损失率超过50%,保存到66d,已检测不到有效氯浓度;ORP在保存的前45d内,电位降低较缓慢,一直维持在1100mV以上,保存52～66d,电位迅速下降,从1050mV降至612mV。在保存的前7d内,酸性氧化电位水的灭菌率均为100%。保存7d后,灭菌率明显下降,在保存10d后,灭菌率不到90%,在保存45d后,灭菌率仅为51%,可认为已基本失去消毒能力。结论酸性氧化电位水在常温、封闭、不避光的保存条件下,有效期为7～10d,有效氯的衰减可能是导致其在保存过程中消毒能力降低的主要原因。
Objective The aim of the paper is to investigate the alteration of the physical-chemical properties and disinfection effect of electrolyzed-oxidizing water during storage, and to provide theory support for its application. Methods A typical electrolyzed-oxidizing water was stored under a closed and light condition for 66 clays and its physical-chemical parameters and disinfection effect were measured at fixed periods. Results The results showed that the chlorine loss of the electrolyzed-oxidizing water was quite fast and reached 50% and 100% after 10 days and 66 days of storage period respectively, the pH value was quite stable, from 2.5 to 2.47. The oxidation-reduction potential （ORP） of the water decreased slowly only from 1 146 mV to 1100 mV within 45 day, but decreased rapidly after 45 days of storage. The results also showed that the inactivation of Bacillus subtilis vat niger spores by the electrolyzed-oxidizing water also decreased rapidly after one week of storage ,from 100% （the first week） to less than 90% （after 10 days）. Conclusion The electrolyzed-oxidizing water can keep its strong disinfection effect after 7-10 days of storage. It was believed that the chlorine loss from the electrolyzed-oxidizing water was the main reason for the decrease of its disinfection effect during storage.
出处
《环境与健康杂志》
CAS
CSCD
北大核心
2007年第5期308-309,共2页
Journal of Environment and Health
基金
广东省科技厅基金资助项目(2005B32401007
200483330101009)
关键词
消毒
酸性氧化电位水
保存期
Disinfection, Electrolyzed-oxidizing water
Storage
