||Sulfur Budget of Lake Shelbyville, Illinois, and the Effects of Sulfides Upon 'Chaoborus'.
Brigha, Warren U. ;
Gnilk, Sarah R. ;
||Illinois Univ., Urbana. Water Resources Center.
||UILU-WRC-73-0066 ;WRC-RR-66; DI-14-31-0001-3813; OWRR-A-056-ILL; 13005,; A-056-(LL(1)
( Lake Shelbyville ;
Water pollution ;
Seasonal variations ;
Hydrogen sulfide ;
Sulfate reducing bacteria ;
Aquatic animals ;
Anaerobic conditions ;
Water pollution effects(Animals) ;
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
The sources and annual cycle of sulfur were studies in the Lake Shelbyville Basin, Illinois. Three sources of sulfur were identified: rainfall, surface runoff, and pollution. Decomposition of inundated organic matter and solution of inorganic sulfur compounds from the inundated basin were considered one-time sources. Exchange between groundwater and the lake was considered to be in long-term equilibrium. Significant relationships between sulfate loading and discharge were detected. Regression analysis yielded an accurate means of calculating sulfate concentration from discharge measurements. Static bioassay studies of Chaoborus larvae yielded a minimum effect level for hydrogen sulfide of 0.64 mg/liter (as S) for a 4-hour test. Pupae responded more rapidly to sulfide than did larvae. Relatively brief exposure to a low sulfide concentration was often sufficient to kill or immobilize a substantial percentage of the test organisms. (Modified author abstract)