Heavy metal ion interaction and transport with synthetic complexing agents and detergent phosphate substitutes in aquatic systems
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Abstract
The chemical aspects of the copper micronutrient requirement for algae have been investigated. A reproducible copper requirement for Chlorella vulgaris and Oocystis marssonii was demonstrated. Optimal growth was observed above 40 micrograms/1 for Oocystis and 30/1 for Chlorella. A study of the effects of EDTA on the toxicity of copper to Chlorella showed that copper in chelated form was not toxic to these algae at concentrations up to 46 mg/1 copper. When only sufficient chelating agent was present to keep the iron (III) in solution however, the toxic effects of copper were evident at 7.00 mg/1 of copper. A second aspect of the project involved the development of a simple, direct multiple standard addition method for the potentiometric analysis of copper in water with a solid-state copper ion-selective electrode. The technique is more sensitive than conventional atomic absorption analysis, though not so rapid. Measurements are made in a complexing antioxidant buffer medium containing acetate (to complex copper), fluoride (to complex iron), and formaldehyde (to provide a reducing medium).
This material is based upon work supported by the U.S. Geological Survey and the Missouri Water Center under the Grant/Cooperative Agreement.
The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the opinions or policies of the U.S. Geological Survey or Missouri Water Center. Mention of trade names or commercial products does not constitute their endorsement by the U.S. Geological Survey or Missouri Water Center.
This material is based upon work supported by the U.S. Geological Survey and the Missouri Water Center under the Grant/Cooperative Agreement.
The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the opinions or policies of the U.S. Geological Survey or Missouri Water Center. Mention of trade names or commercial products does not constitute their endorsement by the U.S. Geological Survey or Missouri Water Center.