Full Record Display for the EPA National Library Catalog


Main Title Flow-through System for Exposure of Seagrass to Pollutants.
Author Walsh, Gerald E. ; Hansen, Donna L. ; Lawrence, Debra A. ;
CORP Author Environmental Research Lab., Gulf Breeze, FL.
Year Published 1981
Report Number EPA-600/J-81-110 ;Contrib-426;
Stock Number PB83-130070
Additional Subjects Sea grasses ; Toxicology ; Plants(Botany) ; Exposure ; Oxygen ; Uptake ; Physiological effects ; Photosynthesis ; Respiration ; Reprints ; Water pollution effects(Plants) ; Thalassia testudinum ; Aatrex ; Phenol/pentachloro
Library Call Number Additional Info Location Last
NTIS  PB83-130070 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 13p
Abstract A flow-through system for exposure of seagrass to pollutants is described. Sea water with dissolved atrazine or PCP (pentachlorophenol) was pumped through a sealed 2-liter volume glass exposure vessel that contained wither whole plants or leaves of Thalassia testudinum. Effects of the compounds on oxygen evolution and uptake by leaves were measured after exposure for 40 and 88 hrs. Rate of oxygen evolution was depressed strongly after 40 hrs by 1 ppm of atrazine or PCP. The rate of oxygen uptake was slightly depressed by atrazine but strongly depressed by PCP. Photosynthesis/respiration ratios were depressed to less than one by 1 ppm of atrazine or PCP and by 0.5 ppm atrazine. EC50 values based upon depression of oxygen evolution after 40 hrs exposure were: atrazine, 0.32 ppm; PCP, 0.74 ppm. The data suggest that leaves may recover from or adapt to the presence of either toxicant.
Supplementary Notes Pub. in Marine Environmental Research 7. p1-11 1982.
NTIS Title Notes Journal article.
Title Annotations Reprint: A Flow-through System for Exposure of Seagrass to Pollutants.
PUB Date Free Form 8 Dec 81
Category Codes 6T; 6F; 57Y; 68D
NTIS Prices PC A02/MF A01
Primary Description 600/04
Document Type NT
Cataloging Source NTIS/MT
Control Number 306321744
Origin NTIS
Type CAT