Record Display for the EPA National Library Catalog


Main Title Development of a Selective Algaecide to Control Nuisance Algal Growth.
Author Prow, Bernard L. ; McIlhenn, William F. ;
CORP Author Dow Chemical Co., Freeport, Tex. Texas Div.
Year Published 1973
Report Number EPA-68-01-0076; EPA-16010-EDJ; 00702,; 660/3-73-006
Stock Number PB-225 027
Additional Subjects ( Algicides ; Tests) ; ( Pesticides ; Algae) ; Economic analysis ; Safety ; Production ; Aquatic weeds ; Water quality ; Water supply ; Protozoa ; Anabaena cylindrica ; Microcystis aeruginosa ; Ochromonas ovalis ; Biological weed control
Library Call Number Additional Info Location Last
NTIS  PB-225 027 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 137p
A compound which would effectively and economically control the growth of nuisance species of blue-green algae with a minimum impact on desirable forms of life in the aquatic environment was searched for. A computerized structure search of more than 100,000 compounds was made to select the analogs of the following four Phase I prime candidates: 2,5-Dichloro-3,4-dinithrothiophene; (5-Chloro-2-(p-nitrophenoxy)phenyl)phenyliodoniumchloride; 4-Amino-2,5-dibromophenylthiocyanate; and 1,1-Dimethyltetradecylamine, hydro-chloride. Through this endeavor 1309 compounds were selected, 41 of which emerged from a rapid, agar-plate screening as candidates for final laboratory screening tests. A golden-brown flagellate, Ochromonas ovalis, which exhibited phagocytic activity against the blue-green alga, Microcystis aeruginosa, was discovered during Phase I. Further research and development of biological-chemical control system included studies involving several species of Ochromonas and conditions which would enhance their phagocytic activity against Microcystis aeruginosa, with Ochromonas ovalis proving to be the most voracious feeder.