Project Details

Project Name: Biodegradability
Country: USA
Description: The current environmental climate is such that users of commercial products require information concerning the effects that such products will have on the environment and aquatic life if released. One source of environmental information can be obtained by studying the toxic effects of commercial products on native indicating species. The project involved the determination of the toxicity of a new commercial product and comparing the toxicity to that of a currently available commercial product for reference during the evaluation. The project involved the use of Ceriodaphnia dubia as the indicator species for the determination of the toxicity of all products. Also, activated sludge was used to determine the dissolved oxygen uptake rate (DOUR) for the new product. This procedure measured the concentration at which the product inhibits the viability of the microorganisms and is another measure of toxicity. In addition, the Zahn-Wellens Biodegradability, also called Inherent Biodegradability (OECD Method 302), was determined using a static batch reactor for the new commercial product at a concentration determined to be toxic to Ceriodaphnia dubia. This procedure measured the loss of chemical oxygen demand (COD) for the commercial product during degradation and also compared the toxicity of the commercial product before and after degradation had taken place.

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