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Chesapeake Science

, Volume 17, Issue 2, pp 125–128 | Cite as

The toxicity of malathion and its hydrolysis products to the Eastern Mudminnow,Umbra pygmaea (DeKay)

  • Michael E. Bender
  • James R. Westman
Short Papers and Notes

Abstract

The toxicity of malathion and its major hydrolysis products to the eastern mudminnow,Umbra pygmaea, was determined by utilizing 4-day static toxicity tests and 14-day continuous flow tests. Four-day LC50 values in mg/l were as follows: malathion 0.24; dimethylphosphorodithioic acid 17; diethyl fumarate 8.5; 2-mercaptodiethylsuccinate 47 and dimethylphosphorothionic acid 26. The basic hydrolysis products proved to be more toxic than the acid hydrolysis products and 14-day continuous flow tests were conducted only on malathion and the basic hydrolysis products. Calculations of field application rates for the pesticide reviewed in light of the toxicity results suggest that only the parent compound, malathion, poses an environmental hazard to the mudminnow.

Keywords

Hydrolysis Product Malathion Fathead Minnow Gloucester Point LC50 Concentration 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer 1976

Authors and Affiliations

  • Michael E. Bender
    • 1
  • James R. Westman
    • 1
  1. 1.Rutgers UniversityNew Brunswick

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