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Measurement of Total Calcium by Flash Chronopotentiometry at Polymer Membrane Ion-selective Electrodes by Kebede L. Gemene; Eric Bakker is a Chemistry article available to read on EtoBox.
What is Measurement of Total Calcium by Flash Chronopotentiometry at Polymer Membrane Ion-selective Electrodes about?
Ionophore-based ion-selective electrodes are widely used for potentiometric electrolyte measurements, in which case they are known to detect the free ion activity. Total ion concentrations cannot be directly assessed by this methodology if the ion is predominantly present in a complexed form. We present here the direct measurement of total calcium using a calcium ion-selective electrode interrogated in a flash chronopotentiometric transduction mode. A high magnitude of cathodic current pulse is applied across a calcium ion-selective membrane containing the ionophore ETH 5234 but void of ion-exchanger to prevent spontaneous extraction. This induces a defined flux of calcium ions from the sample side to the membrane and results in the release of labile bound calcium and a concomitant depletion at the membrane surface at a critical current or time. This is observed as an inflection point on the potential-time curve and the square root of the transition time is linearly related to the total concentration in the sample. It is shown that the responses to solutions of labile calcium complexes of nitrilotriacetic acid (NTA) are in a good agreement with that of the same concentration of cal
Who reads Measurement of Total Calcium by Flash Chronopotentiometry at Polymer Membrane Ion-selective Electrodes?
It is typically read by researchers, students, and practitioners in Chemistry.
- Author
- Kebede L. Gemene; Eric Bakker
- Publisher
- Elsevier Science; Elsevier ; Elsevier BV (ISSN 0003-2670)
- Published
- 2009
- Language
- EN
- Field
- Chemistry (Physical Sciences)