OLS : Record


Main Title Activated Sludge Respiration Inhibition Test of Dow Corning 36 Emulsion, with Cover Letter dated 10/15/1998.
CORP Author Wildlife International, Auburn, AL.; Dow Corning Corp., Midland, MI.; Environmental Protection Agency, Washington, DC. Office of Toxic Substances.
Year Published 1998
Stock Number OTS0573853
Subjects Toxicology; Health effects; Dimethyl silicones; Dimethyl siloxanes; Environmental fate; Biodegradation; CAS No 75-07-0; CAS No 631488-62-9; CAS No 67762-90-7
Library   Call Number Additional Info Location Date Modified
NTIS OTS0573853 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 09/09/2010
Collation 77p
Abstract The effect of the test substance on activated sludge microorganisms was assessed by the Activated Sludge Respiration Inhibition Test Method (OECD Guideline 209). The test contained a control, reference and treatment groups. The control group was used to determine the background respiration rate of the sludge and was not dosed with the test or reference substance. The reference group was dosed with 3,5-dichlorophenol, a known inhibitor of respiration, at concentrations of 3, 15 and 50 mg/L. The test substance was dosed at 1, 3, 10, 30, 100, 300, and 1000 mg/L. After an exposure period of 3 hours, the respiration rates of the test solutions were measured using a dissolved oxygen meter. The respiration rates in the two controls were 41.2 and 48.4 mg O,/L/hr, or a difference of 14.9%. The difference in control respiration rates was within the 15% difference limit established for the test. The validity of the test was further supported by the results from the 3,5-dichlorophenol reference group, which resulted in an EC50 of 8.6 mg/L. The EC50 was within the 5 to 30 mg/L range considered acceptable for the test.
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PUB Date Free Form 22 Oct 1998
Category Codes 57Y; 57U; 68G; 99; 44G
NTIS Prices PC A06/MF A06
Document Type NT
Control Number 028701140
Cataloging Source NTIS/MT
Origin NTIS
Type CAT