Photo-induced formation of dissolved gaseous mercury in coastal and offshore seawater of the Mediterranean basin

被引：41

作者：

Lanzillotta, E ^{[1
]}

Ceccarini, C ^{[1
]}

Ferrara, R ^{[1
]}

机构：

[1] CNR, Inst Biophys, I-56100 Pisa, Italy

来源：

SCIENCE OF THE TOTAL ENVIRONMENT | 2002年 / 300卷 / 1-3期

关键词：

mercury; dissolved gaseous mercury; seawater; Mediterranean basin;

D O I：

10.1016/S0048-9697(02)00223-1

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

sThe first measurements on the daily trend of dissolved gaseous mercury (DGM) concentration determined in coastal and offshore waters of the Mediterranean basin are reported. Marked daily behaviour tracking solar radiation has been observed at the coastal sampling station with DGM values ranging from 11.0 to 38.9 pg/l. Contrary to these observations the DGM values in offshore water samples (11.9-20.0 pg/l) were independent of the sampling time, thus identifying the absence of higher levels during the hours of maximum insolation. The availability of Hg2+ substrate necessary for the photo-reaction processes of DGM formation has been evaluated by measuring the reactive mercury concentration. In offshore waters the lower DGM concentrations are attributable to the substrate as a limiting factor. The highest concentration of DOC measured in coastal seawater with respect to the offshore one could moreover enhance the reaction rates of DGM production through the formation of inorganic mercury complexes and weaker organic associations. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：179 / 187

页数：9

共 39 条

[11] Photoreduction of mercury in sea water and its possible implications for Hg0 air-sea fluxes [J].