Inactivation of Pseudomonas aeruginosa and Aeromonas hydrophila by silver in tap water
Inactivation of Pseudomonas aeruginosa and Aeromonas hydrophila by silver in tap water
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DOI：
10.1080/10934520701517689
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发表时间：
2007-01-01
影响因子：
2.1
通讯作者：
Gerba, Charles P.
中科院分区：
文献类型：
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作者：
Silvestry-Rodriguez, Nadia;Bright, Kelly R.;Gerba, Charles P.
本研究旨在评估银作为二级消毒剂替代或降低配水系统中氯含量的有效性。铜绿假单胞菌和铜绿假单胞菌是存在于饮用水中的条件致病菌，并与水传播疾病有关。在暴露于100 μ g/L的银8小时后，在室温和pH 7下，自来水中的铜绿假单胞菌减少> 6-log 10，在3 mg/L腐殖酸存在下减少5.55-log 10。在pH 9下观察到类似的减少。在4 ℃下，24小时后观察到大于4-log 10的减少。对于.在pH 7和pH 9条件下，9小时内均发生> 6-log 10的减少。世界卫生组织已经确定，这个数量的银可以用于水消毒，而不会对健康造成风险。此外，银显示出作为二级消毒剂的前景，即使在存在浓度会降低游离氯的有效性的有机物质的情况下。
This study was conducted to assess the efficacy of silver as a secondary disinfectant to replace or reduce the level of chlorine utilized in water distribution systems. Pseudomonas aeruginosa and Aeromonas hydrophila are opportunistic pathogens present in drinking water and have been associated with waterborne disease. After 8 hours of exposure to 100 mu g/L of silver, there was a > 6-log10 reduction in P. aeruginosa in tap water at room temperature at pH7 and a 5.55-log10 reduction in the presence of 3 mg/L humic acid. Similar reductions were observed at pH9. At 4 degrees C, reductions greater than 4-log10 were observed after 24 hours. For A. hydrophila, a > 6-log10 reduction occurred at both pH7 and pH9 within nine hours. The World Health Organization has determined that this amount of silver could be used for water disinfection without health risks. Furthermore, silver shows promise as a secondary disinfectant, even in the presence of organic matter in concentrations that would reduce the effectiveness of free chlorine.