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490 results on '"Albaladejo, J."'

101. Modelling within-storm soil erosion dynamics

Author

Torri D., Borselli L., Poesen J., Nactergaele J., Morgan R., Quinton J., Albaladejo J., Castillo V., Mena M., Sardo V., Strauss P., Bazzoffi P., Pellegrini S., and Jetten V.

Published
2002

102. Cs-137 baseline levels in the Mediterranean and Black Sea: A cross-basin survey of the CIESM Mediterranean Mussel Watch programme

Author

Thebault, Herve, Baena, A, Andral, Bruno, Barisic, D, Albaladejo, J, Bologa, A, Boudjenoun, R, Delfanti, R, Egorov, V, Khoukhi, T, Florou, H, Kniewald, G, Noureddine, A, Patrascu, V, Pham, M, Scarpato, A, Stokozov, N, Topcuoglu, S, Warnau, M, Thebault, Herve, Baena, A, Andral, Bruno, Barisic, D, Albaladejo, J, Bologa, A, Boudjenoun, R, Delfanti, R, Egorov, V, Khoukhi, T, Florou, H, Kniewald, G, Noureddine, A, Patrascu, V, Pham, M, Scarpato, A, Stokozov, N, Topcuoglu, S, and Warnau, M

Abstract

The common mussel Mytilus galloprovincialis was selected as unique biomonitor species to implement a regional monitoring programme, the CIESM Mediterranean Mussel Watch (MMW), in the Mediterranean and Black Seas. As of today, and upon standardization of the methodological approach, the MMW Network has been able to quantify Cs-137 levels in mussels from 60 coastal stations and to produce the first distribution map of this artificial radionuclide at the scale of the entire Mediterranean and Black Seas. While: measured Cs-137 levels were found to be very low (usually <1 Bq kg(-1) wet wt) Cs-137 activity concentrations in the Black Sea and North Aegean Sea were up to two orders of magnitude higher than those in the western Mediterranean Basin. Such effects, far from representing a threat to human populations or the environment, reflect a persistent signature of the Chernobyl fallout in this area. (C) 2007 Elsevier Ltd. All rights reserved.

Published
2008
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149. Tropospheric photooxidation of CF3CH2CHO and CF3(CH2)2CHO initiated by Cl atoms and OH radicals.

Author

Antiñolo, M., Jiménez, E., Notario, A., Martínez, E., and Albaladejo, J.

Abstract

The absolute rate coefficients for the tropospheric reactions of chlorine (Cl) atoms and hydroxyl (OH) radicals with CF3CH2CHO and CF3(CH2)2CHO were measured as a function of temperature (263-371 K) and pressure (50-215 Torr of He) by pulsed UV laser photolysis techniques. Vacuum UV resonance fluorescence was employed to detect and monitor the time evolution of Cl atoms. Laser induced fluorescence was used in this work as a detection of OH radicals as a function of reaction time. No pressure dependence of the bimolecular rate coefficients, kCl and kOH, was found at all temperatures. At room temperature kCl and kOH were (in 10-11 cm³ molecule-1 s-1): kCl(CF3CH2CHO)=(1.55±0.53); kCl(CF3(CH2)2CHO)=(3.39±1.38); kOH(CF3CH2CHO)=(0.259±0.050); kOH(CF3(CH2)2CHO)=(1.28±0.24). A slightly negative temperature dependence of kCl was observed for CF3CH2CHO and CF3(CH2)2CHO, and kOH(CF3CH2CHO). In contrast, kOH(CF3(CH2)2CHO) did not exhibit a temperature dependence in the studied ranged. Arrhenius expressions for these reactions were: kCl(CF3CH2CHO)=(4.4±1.0)×10-11exp{-(316±68)/T} cm³ molecule-1 s-1, kCl(CF3(CH2)2CHO)=(2.9±0.7) × 10-10 exp{-(625±80)/T} cm³ molecule-1 s-1, kOH(CF3CH2CHO)=(7.8±2.2)×10-12 exp{-(314±90)/T} cm³ molecule-1 s-1. The atmospheric impact of the homogeneous removal by OH radicals and Cl atoms of these fluorinated aldehydes is discussed in terms of the global atmospheric lifetimes, taking into account different degradation pathways. The calculated lifetimes show that atmospheric oxidation of CF3(CH2)x CHO are globally dominated by OH radicals, however reactions initiated by Cl atoms can act as a source of free radicals at dawn in the troposphere. [ABSTRACT FROM AUTHOR]

Published
2009

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