The response of the three broodCeriodaphnia test to fifteen formulations and pure compounds in common use

Abstract

The three broodCeriodaphnia dubia test was carried out on fifteen formulations and pure compounds presently in general use in a variety of treatment processes or as reference toxicants. The most toxic substances (LC₅₀ (based on survival/EC50 (based on total progeny) 3)₂ · 3H₂O, K₂Cr₂O₇, NALCO 7139-a flocculent, DOWFAX 2EP-a surfactant, TB-66-an algicide and ammonia. Exposure to these compounds elicited the same response fromC. dubia for the two endpoints examined-survival and reproductive success. Two antimicrobials, PROXEL GXL and DOWICIL 75, and the surfactant sodium lauryl sulfate, were slightly toxic (LC₅₀/EC₅₀100 mg/L) to slightly toxic (LC₅₀5050<100 mg/L) when the endpoint of reproductive success was examined. These formulations and pure compounds had generally a declining effect on mean brood size, though there were exceptions to this observation as the broods progressed in number.