Massa S, Armuzzi R, Tosques M, Canganella F, Trovatelli L D
Istituto di Produzioni e Preparazioni Alimentari, Facoltà di Agraria, Foggia, Italy.
J Appl Microbiol. 1999 Jan;86(1):168-73. doi: 10.1046/j.1365-2672.1999.00592.x.
The susceptibility of five Aeromonas hydrophila strains and one Escherichia coli strain to chlorine was studied under carefully controlled laboratory conditions. Of the Aer. hydrophila strains, two were from untreated water, two from tap water (immediately downstream of a water treatment plant) and one from the DSM collection. The study included disinfectant concentration (0.1, 0.2 and 0.5 mg l-1), pH (6, 7 and 8) and temperature (4, 21 and 32 degrees C) as controlled variables. The results indicated that the untreated water strains, the DSM strain and the E. coli strain were inactivated within 1 min of chlorine treatment. The strains from chlorinated water (TW11 and TW27) showed a different susceptibility to chlorine disinfection, the rate of inactivation being greater at pH6 than at pH8 for both strains. Under the standard conditions of temperature 21 degrees C, pH7 and chlorine concentration 0.2 mg l-1, an increase or decrease of approximately 1 log unit in the number of bacteria did not affect the kill rate of the strains TW11 and TW27.
在严格控制的实验室条件下，研究了五株嗜水气单胞菌菌株和一株大肠杆菌菌株对氯的敏感性。在嗜水气单胞菌菌株中，两株来自未处理的水，两株来自自来水（水处理厂下游紧邻处），一株来自德国微生物保藏中心（DSM）的菌种保藏库。该研究将消毒剂浓度（0.1、0.2和0.5毫克/升）、pH值（6、7和8）以及温度（4、21和32摄氏度）作为控制变量。结果表明，未处理水菌株、DSM菌株和大肠杆菌菌株在氯处理1分钟内即被灭活。来自氯化水的菌株（TW11和TW27）对氯消毒表现出不同的敏感性，两株菌在pH6时的灭活速率均高于pH8时。在温度21摄氏度、pH7和氯浓度0.2毫克/升的标准条件下，细菌数量增加或减少约1个对数单位并不影响TW11和TW27菌株的杀灭率。
