John Wiley & Sons, Ltd.

Diurnal variations of total mercury (THg), reactive mercury (RHg), and dissolved gaseous mercury and water/air mercury flux in warm and cold season from fresh waters of Southwestern China

0
Diurnal variations of water total mercury (THg), reactive mercury (RHg), and dissolved gaseous mercury (DGM) concentrations and mercury flux were monitored at two sites in warm and cold season in an alkaline reservoir in Southwestern China. Concentrations of THg and RHg as well as Hg fluxes usually exhibited a consistent diurnal trend with elevated values observed during day. The increasing rate of RHg concentrations and Hg fluxes were highly related to the incident intensity of solar radiation, suggesting sunlight‐induced processes played an important role in the transformation of Hg in the study area. DGM concentrations experienced different diurnal variations among the sampling sites, with peak DGM at midday under sunny weather conditions and peak in the early morning under cloudy and/or partially cloudy weather conditions, respectively. The peak values of DGM observed at midday agrees well with previous study and highlights the sunlight‐induced production of DGM in fresh waters; whereas DGM peaks at night suggests that microbial activity might be also an additional mechanism for DGM production in surface waters. THg, RHg, and DGM concentrations and Hg fluxes in warm season were consistently higher than cold season, and this is probably attributed to the combined effect of seasonal variations of environmental parameters, transformation of mercury species and microbial activities. Environ Toxicol Chem © 2013 SETAC

Customer comments

No comments were found for Diurnal variations of total mercury (THg), reactive mercury (RHg), and dissolved gaseous mercury and water/air mercury flux in warm and cold season from fresh waters of Southwestern China. Be the first to comment!