Toxicity Evaluation of Surface Water Samples Preserved in Different Ways: Refrigeration and Freezing
DOI:
https://doi.org/10.5132/jbse.2006.02.012Keywords:
chronic toxicity, Ceriodaphnia dubia, sample preservation, freezing, refrigerationAbstract
The correct proceedings for sample collection, preservation and storage regarding toxicity tests with aquatic organisms, will guarantee the reliability of results of these tests. Recently, some standard procedures advise that samples should be preserved by refrigeration (for a short time) or by freezing (for a long time). The aim of this study was to compare the results of chronic toxicity tests with Ceriodaphnia dubia using, to the renewal of test solutions, samples with two different ways of preservation: refrigeration (temperature at 2 to 5°C) and freezing in aliquots (temperature at –3 to –25°C). Tests results indicated that there was no significant differences on toxicity to C. dubia, between samples refrigerated or frozen.
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