Characteristics of mercury speciation in Minnesota rivers and streams

被引：26

作者：

Balogh, Steven J. ^{[1
]}

Swain, Edward B. ^{[2
]}

Nollet, Yabing H. ^{[1
]}

机构：

[1] Metropolitan Council Environm Serv, St Paul, MN 55106 USA

[2] Minnesota Pollut Control Agcy, St Paul, MN 55155 USA

来源：

ENVIRONMENTAL POLLUTION | 2008年 / 154卷 / 01期

关键词：

mercury; speciation; Minnesota; stream; DOC;

D O I：

10.1016/j.envpol.2007.11.014

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Patterns of mercury (Hg) speciation were examined in four Minnesota streams ranging from the main-stem Mississippi River to small tributaries in the basin. Filtered phase concentrations of methylmercury (MeHg), inorganic Hg (IHg), and dissolved organic carbon (DOC) were higher in all streams during a major summertime runoff event, and DOC was enriched with MeHg but not with IHg. Particulate-phase MeHg and IHg concentrations generally increased with total suspended solids (TSS) concentrations but the event data did not diverge greatly from the non-event data, suggesting that sources of suspended sediments in these streams did not vary significantly between event and non-event samplings. The dissolved fractions (filtered concentration/unfiltered concentration) of both MeHg and IHg increased with increasing DOC concentrations, but varied inversely with TSS concentrations. While MeHg typically constitutes only a minor portion of the total Hg (THg) in these streams, this contribution is not constant and can vary greatly over time in response to watershed inputs. (C) 2007 Elsevier Ltd. All rights reserved.

引用

页码：3 / 11

页数：9

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