Dernière mise à jour le : 1 janvier 1999

Chemical characteristics of precipitation at an Atlantic station

DESCRIPTION

Weekly or half-monthly bulk rainwater samples were collected over 3 yr (1993-1995) at Porspoder, an Atlantic station near Brest, France. They were analyzed for 0.08 M HNO3-leachable trace metals Cd, Cu, Fe, Mn, Ni, Pb and Zn by direct electrothermal atomic absorption spectrometry. Major ions and nitrogen species (NO3/- and NH4/+) in precipitation were determined by ion chromatography. In coastal precitation, a high correlation was observed for major ions having a seawater origin (Na+, CL- and Mg2+. Zn, Cd, Cu, Ni and Pb were well correlated indicating their anthropogenic origin. In the case of nitrogen species and nssSO4/2- a high correlation with Zn was observed, taken as an anthropogenic pollution tracer. Major ions and nitrogen species were determined according to wind sector direction showing clearly the impact of the pollution at this station attributed to continental air masses. A relative constancy of pH values in all wind directions was observed. Due to an important oceanic influence, trace metal concentrations and annual deposition densities were significantly lower at Porspoder than at North Sea coastal stations. In the case of nitrogen species, the relatively higher concentration levels probably indicated a significant local agricultural contribution.

NOTICE BIBLIOGRAPHIQUE DETAILLÉE

keyboard_arrow_right Titre : Chemical characteristics of precipitation at an Atlantic station
keyboard_arrow_right Type de documentation : Articles
keyboard_arrow_right Auteur(s) personne(s) : Cabon Jean Yves
keyboard_arrow_right Date de publication : 1 janvier 1999
keyboard_arrow_right Editeur(s) : s. n.
keyboard_arrow_right Tags thématiques : pollution, pluie, pollution de l'eau
keyboard_arrow_right Mots-clés libres : Correlations
keyboard_arrow_right Localisation : PORSPODER
keyboard_arrow_right Langue : Anglais
keyboard_arrow_right Collection : Water, Air and Soil Pollution

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