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Identifier

000033854

Title

Άμεσος προσδιορισμός των νιτρικών ιόντων σε φυτικούς ιστούς

Alternative Title

Direct potentiometric analysis of nitrates in plant tissues

Author

Γενιατάκης, Ευθύμιος

Thesis advisor

Χανιωτάκης, Νικόλαος

Abstract

This project presents a direct potentiometric determination of nitrates in dry plant tissues. Nitrate extraction is performed by stirring, in the presence of a solid -contact nitrate selective electrode. The electrode records the falling potential, until it reaches to the lowest value, after 3 - 10 min, depending on the concentration level of nitrates in the sample. The minimum potential value is used for the determination of nitrates. In a suitable calibrated ionometer, nitrate concentration in ppm or M can be displayed. Three different kinds of plant material have been analysed. Lettuce, with high concentration levels of nitrates, olive oil leaves with medium levels and coffee with low levels. The effect of sample mass in the precision of the method and electrode response time was evaluated. For each sample recovery test was performed. Nitrate values obtained by the direct method correlated with those obtained by the classic potentiometric method.

Language

Greek

Subject

Electrode

Nitrate analysis

Plant nitrate

Potentiometric analysis

Ανάλυση νιτρικών ιόντων

Ηλεκτρόδιο νικτρικών

Νιτρικά σε φυτά

Ποτενσιομετρική ανάλυση

Issue date