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Glossary - E

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"EC50" means, for Acute Toxicity Testing, the statistical estimate of the toxicant concentration that has a specified adverse effect (such as immobilization, change in respiration rate, or loss of equilibrium) on 50 percent of test organisms after a specific time of exposure.

"EDL" means an electrodeless discharge lamp used in atomic absorption spectroscopy.

"Effective Concentration (EC)" means, for Acute Toxicity Testing, the statistical estimate of the toxicant concentration that has a specified adverse effect (such as immobilization, change in respiration rate, or loss of equilibrium) in a given time.

Effluent" means the outflow from a point source.

"EPA Acute Methods #013-1985" means, for Acute Toxicity Testing, Methods for Measuring The Acute Toxicity of Effluents to Freshwater and Marine Organisms, 3rd ed, USEPA, Environmental Monitoring and Support Laboratory, Cincinnati, Ohio 45268, USEPA-600-4-85-013.

"EPA Acute Methods #027F-1993" means, for Acute Toxicity Testing, Methods for Measuring the Acute Toxicity of Effluents for Freshwater and Marine Organisms, ,4th ed, USEPA, Environmental Monitoring and Support Laboratory, Cincinnati, Ohio 45268, EPA-600/4-90/027F.

"EPA Microbiological Methods" means, for microbiological testing, Microbiological Methods for Monitoring the Environment, USEPA-600/8-78-017.

"Exposure time" means, for Acute Toxicity Testing, the time of exposure of test organisms to a test solution for parameters in the Acute Toxicity Testing Category.

 

 

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