δείτε την πρωτότυπη σελίδα τεκμηρίου στον ιστότοπο του αποθετηρίου του φορέα για περισσότερες πληροφορίες και για να δείτε όλα τα ψηφιακά αρχεία του τεκμηρίου*
Electrochemical methods for monitoring the volatile pyrolysis products of Pinus halepensis pine-needles
(EN)
Gakis, D
(EN)
Statheropoulos, M
(EN)
Liodakis, S
(EN)
Pappa, A
(EN)
Tzamtzis, N
(EN)
Various electrochemical methods such as oxidation-reduction potentiometry, pH-metry and conductometry were used for monitoring the volatile pyrolysis products of Pinus halepensis pine-needles. The study was carried out under non-isothermal conditions (ambient to 400 degrees C) with a heating rate of 10 degrees C min(-1), in nitrogen atmosphere. Products with the lowest redox potential values, such as aldehydes and alcohols, were evolved between 180 and 230 degrees C. Products with the highest conductivity values such as carboxylic acids, were evolved in the temperature range of 240-320 degrees C, whilst those with the lowest pH values, such as phenols and acids were evolved in the temperature range of 220-300 degrees C. The results of this study are in agreement with those obtained previously by DI-MS, Py-GC-FID and Py-GC-MS. The electrochemical methods have the advantage of being simple, fast and low cost methods for monitoring the pyrolysis products. The redox potential value is examined as a measure of the chemical stability (i.e. the reducing properties increase as the redox values decrease) correlated with the flammability of the pyrolysis products. (C) 1997 Elsevier Science B.V.
(EN)
*Η εύρυθμη και αδιάλειπτη λειτουργία των διαδικτυακών διευθύνσεων των συλλογών (ψηφιακό αρχείο, καρτέλα τεκμηρίου στο αποθετήριο) είναι αποκλειστική ευθύνη των αντίστοιχων Φορέων περιεχομένου.
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