Inactivation of Hepatitis A Virus (HAV) by Chlorine and Iodine in Water
Abstract
The inactivation of purified, aggregated hepatitis A virus (HAV), poliovirus 1 and echovirus 1 by 1 and 5 mg/1 free chlorine and 1 and 2 tablets per quart Army iodine (globaline) in buffered, demand-free water at pH 4.5, 7.0 and 9.5 and 5 and 25 C was determined. HAV inactivation by chlorine was rapid (99.99% in <8 min.) Polio 1 and echo 1 inactivation by chlorine was rapid at pH 4.5 and 7.0 (99.99% in <8 min.) but slower at pH 9.5, especially at 1 mg/1 and 5 C (59 to >> 60 min.). Inactivation of all test viruses by iodine was always rapid at pH 9.5 (99.99% in <9 min.) but relatively slow at pH 4.5. At pH 7.0, iodine inactivation was rapid for all viruses at 25 C, but at 5 C, it was rapid for HAV, slow for echo 1 and moderate for polio 1. Thus, Army iodine may not inactivate all viruses rapidly under some field conditions. Further studies are needed to determine if virus inactivation by free chlorine and Army iodine is reduced by dissolved organics and suspended solids in water. Keywords: Water treatment, Disinfection.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1988
- Accession Number
- ADA205231
Entities
People
- Mark D. Sobsey
Organizations
- University of North Carolina at Chapel Hill