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irgarol (Irgarol) NYSDEC Registration of Irgarol Algicide 7/96

New York State Department of Environmental Conservation
Division of Solid & Hazardous Materials
Bureau of Pesticides & Radiation
Pesticide Product Registration Section
50 Wolf Road, Albany, New York 12233-7257
Phone 518-457-7446 FAX 518-485-8990
                                       July 11, 1996
Mr. Wilhelm W. Wang
Manager, Product Safety
Additives Division
Ciba-Geigy Corporation
540 White Plains Road
Tarrytown, NY 10591-9005
Dear Mr. Wang:
Re:  Registration of the New Active Ingredient Irgarol Contained in the New
     Pesticide Products Irgarol 1051 (EPA Reg. No. 40810-11) and Irgarol 1071
     (EPA Reg. No. 40810-15)
     Ciba-Geigy Corporation, Additives Division, applied for New York State 
registration, on April 17, 1996, for Irgarol 1051 (EPA Reg. No.40810-11) and 
Irgarol 1071 (EPA Reg. No. 40810-15) which contain the new active ingredient 
     Irgarol 105 is an algicide intended for use in formulating antifouling 
paints for boats and vessels only. Irgarol 1071 is an algicide intended for 
use in the manufacture of aqueous and solvent coating compositions: paints, 
coatings, stucco, stains, and caulks for outdoor uses to inhibit or control 
the growth of algae on coating surfaces.
     The New York State Department of Environmental Conservation (the 
Department) has completed the review of the information supplied to date in 
support of the pesticide product registration application for Irgarol 1051 and 
Irgarol 1071.
     Products formulated from Irgarol 1071 may not come in contact with water, 
and cannot be used on wood or any other treated material which is to be used 
for food, feed, potable water, livestock, dairy animals, or living plants. 
Additional fate data, which includes a leach rate study, will be required from 
Irgarol 1071 formulators applying for federal registration.
     The requirements of federal registration for end-use formulators of 
Irgarol 1051 include additional ecological effects and environmental fate 
data, such as a leaching study and aquatic plant growth. Also, field 
monitoring of water, sediment, and tissue is held in reserve.
     The data indicates that irgarol is stable. There was no hydrolysis in 
either fresh or salt water. EPA considered the aqueous photolysis to be stable 
with a half-life ranging from 35.9 to 84.8 days. Anaerobic and aerobic aquatic 
metabolism were considered stable. Adsorption/desorption studies on clay loams 
indicated half-lives of 502-548 days, and 820-956 days on sandy loam.
     Limited toxicity testing was required for federal registration of irgarol 
due to its intended use. Technical irgarol, on an acute basis, is not very 
toxic to laboratory animals by the oral, dermal or inhalation exposure routes. 
Irgarol is mildly irritating to rabbit eyes and is a moderate dermal 
sensitizer in guinea pigs. Irgarol was not toxic in a 90-day rat feeding 
study, and did not cause teratogenic effects in a rat development toxicity 
study, or local systemic effects in a 21-day rat dermal exposure study. 
Irgarol was negative in a battery of genotoxicity tests.
     There are no chemical-specific federal or New York State drinking 
water/groundwater standards for irgarol. Based on its chemical structure, 
irgarol falls under the 50 micrograms per liter (ug/L) New York State drinking 
water standard for an "unspecified organic contaminant" (lO NYCRR Part 5 - 
Public Water Systems). This value of 50 ug/L should also be considered a 
potential State groundwater standard.
     The use of Irgarol 1051 and Irgarol 1071 for manufacturing paints, 
coatings, stucco, stain and caulk does not appear to pose a significant 
exposure potential to the general public.
     Therefore, the Department hereby accepts for general use registration 
Irgarol 1051 (EPA Reg. No. 40810-11) and Irgarol 1071 (EPA Reg. No. 40810-15).
     Enclosed are your New York State stamped "ACCEPTED" labels and a copy of 
the Certificate of Registration.
     Please contact Maureen Serafini, Supervisor of our Pesticide Product 
Registration Section, at (518) 457-7446, if you have any questions.
                                      Norman H. Nosenchuck, P.E.
                                      Division of Solid & Hazardous Materials
cc:  w/enc. - N. Kim/A. Grey - NYS Dept. of Health
     N. Rudgers/R. Mungari - NYS Dept. of Ag. & Markets
     D. Rutz/W. Smith - Cornell University