Modeling pedogenization of zeolitized tuffs. II: medium-term weathering of phlegraean yellow tuff and red tuff with black scoriae by water and humic acids
An experimental pedology research program was started aiming at modeling the potential pedogenization of zeolitized tuffs. The present study deals with a medium-term weathering of Phlegraean Yellow Tuff (PYT, with phillipsite>chabazite) and Red Tuff with Black Scoriae (RTBS, with chabazite>phillipsite) under discontinuous treatment by water (W) and by humic acids (HA). Significant amounts of cations, increasing in the sequence Al<Fe<Mg<Ca, were extracted by both water and humic acids. The humic acids showed in all cases the highest extracting efficiency. All cations, especially calcium, were more easily removed from PYT than from RTBS. The only exception was iron which was preferentially removed from RTBS by HA. At the end of the experiment, smectite was not any more detected in the PYT residues. On the whole, the results indicate that PYT is more prone than RTBS to both humic acid and water weathering due to its different mineralogy.
A. Buondonno M. Rubino A. Colella C. Colella E. Coppola B. de Gennaro M. de Gennaro N. Gargiulo E. Grilli A. Langella
CRA-Istituto Sperimentale Agronomico, Via Celso Ulpiani 5, 70125 Bari, Italy Dipartimento di Scienze Ambientali, polo Scientifico di Caserta, Seconda Università di Napoli, Via V Dipartimento di Scienze della Terra, Università Federico II, Via Mezzocannone 8, 80134 Napoli, Italy Dipartimento di Ingegneria dei Materiali e della Produzione, Università Federico II, P.le V. Tecchio Dipartimento di Studi Geologici e Ambientali, Università del Sannio, Via Port’Arsa 11,82100 Benevent
国际会议
北京
英文
2007-08-12（万方平台首次上网日期，不代表论文的发表时间）