Enhanced Inactivation of Cryptosporidium parvum Oocysts during Solar Photolysis of Free Available Chlorine
Enhanced Inactivation of Cryptosporidium parvum Oocysts during Solar Photolysis of Free Available Chlorine
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DOI：
10.1021/ez500270u
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发表时间：
2014-10
影响因子：
10.9
通讯作者：
Peiran Zhou;G. Giovanni;J. Meschke;Michael C. Dodd
中科院分区：
文献类型：
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作者：
Peiran Zhou;G. Giovanni;J. Meschke;Michael C. Dodd
太阳辐射的水溶液中含有游离有效氯（FAC）显着提高灭活隐孢子虫卵囊相比，FAC或单独的阳光。在pH 8、10 mM磷酸盐缓冲液、25 °C下，单独暴露于FAC在CTFAC ≤ 832（mg min）L-1时不产生卵囊灭活，而单独暴露于模拟日光60 min产生2 log卵囊灭活。在自然阳光下的天然水中也观察到类似的增强效果。在活性氧（ROS）清除剂叔丁醇的存在下或在没有氧气的情况下进行的实验表明，这些增强是由于原位ROS和臭氧的生产通过FAC光解。
Solar irradiation of aqueous solutions containing free available chlorine (FAC) dramatically enhances inactivation of Cryptosporidium parvum oocysts compared to FAC or sunlight alone. In pH 8, 10 mM phosphate buffer at 25 °C, exposure to FAC alone yields no oocyst inactivation at CTFAC ≤ 832 (mg min) L–1, while exposure to simulated sunlight alone for 60 min yields 2 log oocyst inactivation. Similar enhancement effects are observed in natural water under natural sunlight. Experiments undertaken in the presence of the reactive oxygen species (ROS) scavenger tert-butanol or in the absence of oxygen indicate that these enhancements are due to in situ ROS and ozone production via FAC photolysis.