Total mercury and methylmercury in freshwater and salt marsh soils of the Mississippi river deltaic plain

被引:41
作者
Kongchum, Manoch
Devai, Istvan
DeLaune, R. D. [1 ]
Jugsujinda, Aroon
机构
[1] Louisiana State Univ, Wetland Biogeochem Inst, Sch Coastal & Environm, Baton Rouge, LA 70803 USA
[2] Louisiana State Univ, Dept Agron & Environm Management, Baton Rouge, LA 70803 USA
关键词
methylmercury; mercury; marsh soil; coastal;
D O I
10.1016/j.chemosphere.2005.09.024
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Mercury entering wetland environments can be microbially methylated to methylmercury. The purpose of this study was to investigate the historical rate of mercury accumulation and distribution of total and methylmercury in soil profile of Louisiana coastal marshes. Two sediment cores each were taken from Louisiana freshwater marsh and salt marsh. Vertical accretion was determined using the Cs-137 dating technique. Total and methylmercury were determined with depth in the soil profiles. The fresh marsh soil on a dry weight basis contained more total and methylmercury than the salt marsh. Average vertical accretion rates in freshwater marsh and salt marsh were 0.90 and 0.75 cm year(-1), respectively. Average total and methylmercury content (to a depth of 30 cm) was 140 and 4.19 mu g kg(-1) and 80 and 1.34 mu g kg(-1) for the fresh and salt marsh, respectively. Due to greater sediment input resulting in a higher bulk density the salt marsh contained more total mercury per m(2) (to 30 cm depth) than the fresh water marsh (5340 mu g m(-2) as compared to 2929 mu g m(-2)). The amount of methylmercury per m(2) to depth of 30 cm was approximately the same for each marsh. (c) 2005 Elsevier Ltd. All rights reserved.
引用
收藏
页码:1300 / 1303
页数:4
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