Comparison of mercury speciation and distribution in the water column and sediments between the algal type zone and the macrophytic type zone in a hypereutrophic lake (Dianchi Lake) in Southwestern China

2012 ◽  
Vol 417-418 ◽  
pp. 204-213 ◽  
Author(s):  
Shaofeng Wang ◽  
Mingmei Zhang ◽  
Biao Li ◽  
Denghua Xing ◽  
Xin Wang ◽  
...  
Keyword(s):  
Water Column ◽  
Mercury Speciation ◽  
Southwestern China ◽  
Dianchi Lake ◽  
Lake Dianchi ◽  
Algal Type

Mercury speciation in the Lower St. Lawrence Estuary

2000 ◽  
Vol 57 (S1) ◽  
pp. 138-147 ◽  
Author(s):  
Daniel Cossa ◽  
Charles Gobeil
Keyword(s):  
Water Column ◽  
Surface Waters ◽  
Feeding Habits ◽  
Mercury Speciation ◽  
Estuarine Sediments ◽  
Sediment Surface ◽  
Pore Waters ◽  
Mass Balance Calculation ◽  
Lawrence Estuary ◽  
St Lawrence Estuary

Mercury speciation was determined in the water column and sediment pore waters of the Lower St. Lawrence Estuary, and total Hg (HgT) was measured in seven biological species, including pelagic and demersal fish and crustaceans. In water, HgT concentrations ranged from 1.8 to 7.8 pM, with the highest levels in surface waters and the lowest in deep waters (1.8-2.9 pM). HgT concentrations in sediment pore waters were 10 times as high, with methyl mercury levels of 5.1-14.4 pM. Reactive Hg (HgR) generally accounted for around 20% of HgT in the water column and <30% in pore waters. The distribution of elemental Hg and HgR suggests that Hg(II) is reduced in surface waters and that inorganic Hg is mobilized during remineralization of organic matter at the sediment surface. In the biota, concentrations ranged between 0.05 and 0.89 nmol·g-1 (wet weight). Feeding habits and habitats account for these observations. Results suggest that the sediment is the main source of Hg contamination for the biota. A mass balance calculation showed that the Hg flux entering the lower estuary from the St. Lawrence River is equivalent to the amount buried in estuarine sediments.

Photosynthetic response of Scirpus validus and Typha orientalis to elevated temperatures in Dianchi Lake, Southwestern China

2018 ◽  
Vol 15 (12) ◽  
pp. 2666-2675 ◽  
Author(s):  
Jun-ping Xu ◽  
Mei Sun ◽  
Hang Wang ◽  
Yun Zhang ◽  
Xiao-tang Zhang ◽  
...  
Keyword(s):  
Elevated Temperatures ◽  
Southwestern China ◽  
Dianchi Lake ◽  
Photosynthetic Response ◽  
Scirpus Validus ◽  
Typha Orientalis
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