Effect of residual vanadyl ions on the spectroscopic analysis of humic acids: a multivariate approach
6 pages, 3 figures, 2 tables, 29 references.
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British Society of Soil Science
2008-06
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| Online Access: | http://hdl.handle.net/10261/82770 http://dx.doi.org/10.13039/501100001807 http://dx.doi.org/10.13039/501100001596 |
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dig-irnas-es-10261-827702018-09-12T11:52:19Z Effect of residual vanadyl ions on the spectroscopic analysis of humic acids: a multivariate approach Novotny, Etelvino Knicker, Heike Martin Neto, L. Azeredo, R. V. B. Hayes, M. H. B. Fundação de Amparo à Pesquisa do Estado de São Paulo Irish Research Council for Science, Engineering and Technology 6 pages, 3 figures, 2 tables, 29 references. In a study of the vanadyl (VO2þ )-humic acids system, the residual vanadyl ion suppressed fluorescence and specific electron paramagnetic resonance (EPR) and NMR signals. In the case of NMR, the proton rotating frame relaxation times (T1q H) indicate that this suppression is due to an inefficient H-C cross polarization, which is a consequence of a shortening of T1q H. Principal components analysis (PCA) facilitated the isolation of the effect of the VO2þ ion and indicated that the organic free radical signal was due to at least two paramagnetic centres and that the VO2þ ion preferentially suppressed the species whose electronic density is delocalized over O atoms (greater g-factor). Additionally, the newly obtained variables (principal components – PC) indicated that, as the result of the more intense tillage a relative increase occurred in the accumulation of: (i) recalcitrant structures; (ii) lignin and long-chain alkyl structures; and (iii) organic free radicals with smaller g-factors. The authors are grateful to the Fundacxa˜o de Amparo a` Pesquisa do Estado de Sa˜o Paulo (FAPESP) and to the Irish Research Council for Science, Engineering and Technology (IRCSET) for post-doctoral support. Peer reviewed 2013-09-25T10:03:15Z 2013-09-25T10:03:15Z 2008-06 artículo http://purl.org/coar/resource_type/c_6501 European Journal of Soil Science 59 (3): 439–444 (2008) 1351-0754 http://hdl.handle.net/10261/82770 10.1111/j.1365-2389.2007.00983.x 1365-2389 http://dx.doi.org/10.13039/501100001807 http://dx.doi.org/10.13039/501100001596 en http://dx.doi.org/10.1111/j.1365-2389.2007.00983.x open British Society of Soil Science |
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6 pages, 3 figures, 2 tables, 29 references. |
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Fundação de Amparo à Pesquisa do Estado de São Paulo |
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Fundação de Amparo à Pesquisa do Estado de São Paulo Novotny, Etelvino Knicker, Heike Martin Neto, L. Azeredo, R. V. B. Hayes, M. H. B. |
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artículo |
| author |
Novotny, Etelvino Knicker, Heike Martin Neto, L. Azeredo, R. V. B. Hayes, M. H. B. |
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Novotny, Etelvino Knicker, Heike Martin Neto, L. Azeredo, R. V. B. Hayes, M. H. B. Effect of residual vanadyl ions on the spectroscopic analysis of humic acids: a multivariate approach |
| author_sort |
Novotny, Etelvino |
| title |
Effect of residual vanadyl ions on the spectroscopic analysis of humic acids: a multivariate approach |
| title_short |
Effect of residual vanadyl ions on the spectroscopic analysis of humic acids: a multivariate approach |
| title_full |
Effect of residual vanadyl ions on the spectroscopic analysis of humic acids: a multivariate approach |
| title_fullStr |
Effect of residual vanadyl ions on the spectroscopic analysis of humic acids: a multivariate approach |
| title_full_unstemmed |
Effect of residual vanadyl ions on the spectroscopic analysis of humic acids: a multivariate approach |
| title_sort |
effect of residual vanadyl ions on the spectroscopic analysis of humic acids: a multivariate approach |
| publisher |
British Society of Soil Science |
| publishDate |
2008-06 |
| url |
http://hdl.handle.net/10261/82770 http://dx.doi.org/10.13039/501100001807 http://dx.doi.org/10.13039/501100001596 |
| work_keys_str_mv |
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| _version_ |
1777664665888751616 |