Abstract
The treatment of seawater with ethylenediaminotetraacetic acid (EDTA), as a precautionary measure to avoid heavy metal toxicity, is a standard procedure in Latin American shrimp hatcheries. The recommended application rate of EDTA at concentrations of 5 to 10 g/m3 of seawater (Arellano Moncayo 1990) is costly. A possible alternative is the use of zeolites, some of which have been reported as effective in reducing heavy metal concentrations in industrial wastewaters (Andrews et al. 1991; Malliou et al. 1994; Misaelides and Godelitsas 1995). However, there is little literature available on the amelioration of heavy metal-contaminated water for aquaculture. Jain et al. (1996) obtained a substantial reduction of lead toxicity for freshwater fish using a natural zeolite, but no data are available for saltwater organisms. The purpose of this work was to evaluate the potential of four artificial zeolitic products for reduction of copper toxicity to algae in seawater.
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