Determination of calcium ion in sap using carbon nanotube-based ion-selective electrodes
- 7 June 2010
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in The Analyst
- Vol. 135 (8), 1979-1985
- https://doi.org/10.1039/c0an00148a
Abstract
A new reduced-size solid-state electrode using carbon nanotubes as the transducing layer has been developed for the direct determination of Ca2+ in sap, overcoming problems encountered by commercial ISEs analysing real complex samples. We show that this solid-contact ISE, which can be easily miniaturized, can be used directly in diluted real samples without any other pretreatment. The performance parameters of the new ISE include a Nernstian slope and excellent stability, good coefficients of selectivity, range of linearity (10−5 to 10−2.5 M) and limit of detection (10−6.2 M), thus making it an excellent tool for determining Ca2+ in a wide range of plant species.Keywords
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