EVALUATION OF DISSOLVED AND PARTICULATE ARSENIC FLUX IN THE DOVER STRAIT (FLUXMANCHE PROGRAM)

Citation
P. Michel et al., EVALUATION OF DISSOLVED AND PARTICULATE ARSENIC FLUX IN THE DOVER STRAIT (FLUXMANCHE PROGRAM), Oceanologica acta, 16(5-6), 1993, pp. 585-591
Citations number
11
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Oceanografhy
Journal title
ISSN journal
0399-1784
Volume
16
Issue
5-6
Year of publication
1993
Pages
585 - 591
Database
ISI
SICI code
0399-1784(1993)16:5-6<585:EODAPA>2.0.ZU;2-Y
Abstract
In order to estimate arsenic flux from the English Channel toward the North Sea, 168 samples were obtained from September 1990 to November 1 991 along a transect between Boulogne and Folkestone comprising six st ations and two depths. Organic and inorganic arsenic were measured in dissolved phase and total arsenic in suspended particles. The mean con centration of dissolved total arsenic in water was 1.38 +/- 0.12 mug.l -1. The variability of measured concentrations was low, particularly f or the four intermediate stations. Results were slightly more sensitiv e for English (1.38 +/- 0.12 mug.l-1) and French (135 +/- 0.11 mug.l-1 ) coastal stations due to exchanges with shallower sediments. Dissolve d organic arsenic was nearly negligible from December to March (< 1%) and maximal from July to September, essentially in the form of dimethy larsinic acid. It constituted about 10% of dissolved total arsenic and was related to phytoplankton activity. The lowest concentrations of d issolved total arsenic (1.26 +/- 0.03 mug.l-1) were also measured in J uly. Arsenic in suspended particles (0.16 +/- 0.19 mug.l-1), which acc ounted for only a small portion (i.e. 8.5%) of the total arsenic in th e water column, was more elevated (20%) near the English coasts (0.30 +/- 0.25 mug.l-1). Mean concentrations for particles were 22.2 mug.g-1 , and the distribution coefficient with water was log(K(d)) = 4.14 +/- 0.24. The flux from the English Channel toward the North Sea from 1 O ctober 1990, to 1 October 1991, was 4,442 tons of dissolved arsenic an d 412 tons of particulate arsenic.