OLS : Record

RECORD NUMBER: 16 OF 45

Main Title Effect of halogens on Giardia cyst viability {microform} /
Author Meyer, Ernest A.
CORP Author Oregon Univ. Health Sciences Center, Portland.;Municipal Environmental Research Lab. Cincinnati, OH.
Publisher U.S. Environmental Protection Agency, Municipal Environmental Research Laboratory : Center for Environmental Research Information {distributor},
Place Published Cincinnati, OH :
Year Published 1981
Report Number EPA-R-806032; EPA-600/2-81-174
Stock Number PB82-102294
OCLC Number 48476131
Subjects Water treatment; Disinfection; Potable water; Microorganisms; Chlorination; pH; Iodine; Performance evaluation; Halogens; Parasites; Zoomastigina; Microorganisms; Giardia lamblia
Subject Added Ent Giardiasis; Halogens; Water--Purification
Holdings
Library   Call Number Additional Info Location Date Modified
ERBD PB82-102294 NERL/ESD-LV Library/Las Vegas,NV 11/30/2001
NTIS PB82-102294 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 01/01/1988
Collation 25 p. ; 28 cm.
Abstract The objective of this research was to determine the effect of chlorine and other disinfecting agents on Giardia lamblia cyst viability. The agents studied included free residual chlorine and six different methods recommended for emergency disinfection of small quantities of water. The effect of chlorine concentration on Giardia lamblia cyst viability was tested under a variety of conditions. At 25C, 1.5 mg/l chlorine for 10 min killed all cysts at pH 6, 7, and 8. At 15C, 2.5 mg/l for 10 min killed all cysts at pH 6; but at pH 7 and 8, small numbers of viable cysts remained after 30 min, but not after 60 min. At 5C, 1 mg/l chlorine for 60 min failed to kill all cysts at any pH tested. Contact with 2 mg/l chlorine for 60 min killed all cysts at pH 6 and 7, but not at pH 8. A chlorine concentration of 4 mg/l killed all the cysts at all three pH values after 60 min, but not after 30 min. A chlorine dose of 8 mg/l killed all cysts at pH 6 and 7 aftr 10 min contact and at pH 8 after 30 min. The ability of six small-quantity water disinfection methods to destroy Giardia cysts was also studied. Two water qualities (cloudy and clear) and two temperatures (3 and 20C) were tested. At 20C, using cloudy and clear water, all of the methods proved completely effective. But, at 3C in cloudy water, one method (saturated iodine) was not completely effective, and in clear water, four methods (bleach, Globaline, tincture of iodine and saturated iodine) failed to destroy all the cysts. The failure of these methods appeared to be related to either an insufficient halogen residual or contact time.
Notes Caption title. "Sep. 1981." "EPA-600/2-81-174." Microfiche.
Corporate Au Added Ent Municipial Environmental Research Laboratory.
PUB Date Free Form 1981.
NTIS Prices PC A02/MF A01
BIB Level m
OCLC Time Stamp 20011123122754
Cataloging Source OCLC/T
Language eng
Origin OCLC
Type MERGE
OCLC Rec Leader 01035nam 2200277Ka 45020