Total and Methylmercury of Suaeda heteroptera Wetland Soil Response to a Salinity Gradient Under Wetting and Drying Conditions.

摘要: Mercury (Hg) methylation could occur in freshwater ecosystems with low or high salinity. However, few studies are available about the effects of salinity change on mercury(Hg) release and methylation. In-situ experiments using Suaeda heteroptera wetland soil column from Liaohe estuary were performed to decipher how total mercury (THg) methylmercury (MeHg) contents under fluctuant wet dry conditions. Salinity gradients set 0.50% (S1), 1.00% (S2), 1.50% (S3) 1.80% (S4), pure deionized water was used as a blank control (CK). Wet conditions full inundation condition (WD1) naturally dried treatment (WD2). Results indicated that highest THg MeHg found surface bottom when CK WD1. decreased overlying varied 0.854 1.243 µg L−1 WD1 treatments increased change. When WD2 treatment, both layers gradually rising Meanwhile, reached lowest level at (1.666 μg kg−1and 2.520 μg kg−1) By comparison, content much lower than WD2. Under condition, %MeHg showed significantly different however, its an opposite trend condition.