Inactivation of Giardia Cysts by Iodine with Special Reference to Globaline: A Review

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Abstract:

This review of the literature indicates that iodine is not completely effective in destroying Giardia especially in cold 3 to 15C water. Cysticidal efficacy of iodine at a given concentration and temperature depends on contact time. The iodine tablet, Globaline, used by U.S. Military Forces since 1952, required 60 minutes at 15C, 30 minutes at 25C and 25 minutes at 45C for 100 destruction of Giardia cysts at residual iodine concentration of 10, 8, and 6 mg per liter, respectively. The time required at temperatures below 15C for Globaline tablets to destroy Giardia is not presently known. Based on the information presented in this review, two changes for Globaline are recommended 1 reformulate Globaline tablets with an alkaline buffer and 2 increase the treatment time for one liter of water from 35 minutes to 60 minutes.

Author(s):
Powers, Edmund M.
Author Organization(s):
ARMY NATICK RESEARCH DEVELOPMENT AND ENGINEERING CENTER MA
Descriptive Note:
Final rept. Apr 1989-Apr 1991
Pagination:
0028

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release
Distribution Statement:
Approved For Public Release; Distribution Is Unlimited.

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
NATICK/TR-91/022
Monitor Series:
NATICK
 Subject Terms
Joint Capability Areas:
JCA_7.1.2_Prevent Non-kinetic Attack; JCA_7.1_Prevent; JCA_7_Protection; JCA_8.2.2_Provide Aid to Foreign Partners and Institutions; JCA_8.2_Shape; JCA_8_Building Partnerships; JCA_1_Force Support; JCA_1.2_Force Preparation; JCA_1.2.3_Educating; JCA_5_Command and Control; JCA_3.2_Engagement; JCA_3_Force Application; JCA_5.3_Planning
Modernization Areas:
Cyber
Communities of Interest:
Biomedical
Descriptor(s):
*IODINE, ALKALINITY, BUFFERS, TABLETS(CHEMICAL), TIME, WATER
Field(s)/Group(s):
Water Pollution and Control
Keyword(s):
WUBOO, WATER TREATMENT, TABLETS, STORAGE, IODINE, GLOBALINE, COLD WATER, CYSTS, WATER PURIFICATION THERMAL STABILITY, PE61278N
Report Date:
1991 Apr 01