Calibration of a solid-state copper ion-selective electrode in cupric ion buffers containing chloride.
It is shown that near-Nernstian calibration slopes can be obtained with a Cu(1.8)Se electrode in a range of cupric ion buffers in spite of a high chloride content. Best results are obtained with the ligands ethylenediamine, glycine and histidine. The onset of cupric ion toxicity towards marine organisms falls within the pCu calibration range obtained with glycine, and the Cu(1.8)Se electrode could, therefore, be useful for monitoring cupric ion activity in bioassays in sea-water media.
Hoyer
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Department of Chemistry, Aarhus University, Langelandsgade 140, DK-8000 Aarhus C, Denmark.