[Concentrations and deposition fluxes of different mercury species in precipitation in Jinyun Mountain, Chongqing].

Concentrations of mercury( Hg) species in precipitation were measured during the period from April 2013 to March 2014 in Jinyun Mountain, Chongqing, and corresponding deposition fluxes were also estimated. The result showed that the ranges of concentration of total mercury( THg),dissolved mercury( DHg),particulate mercury( PHg),reactive mercury( RHg),total methyl mercury( Me Hg),dissolved methyl mercury( DMe Hg),particulate methyl mercury( PMe Hg) were 7. 47-120. 11,2. 51-43. 03,2. 28-77. 99,0. 14-15. 14,2. 58 × 10- 2-101. 62 × 10- 2,0. 30 × 10- 2-72. 29 × 10- 2,and 1. 45 × 10- 2-63. 55 × 10- 2ng·L- 1,respectively. And their estimated annual deposition fluxes were 42. 71,23. 51,19. 20,5. 87,0. 61,0. 34 and 0. 27 μg·( m2·a)- 1,respectively. The proportion of Me Hg in THg ranged from 0. 07% to 3. 79% with a mean value of 1. 34%,and both PHg and PMe Hg in precipitation accounted for approximately 50% of THg( ranged from 10. 49% to 89. 30%) and TMe Hg( ranged from 4. 31% to98. 86%). Obvious seasonal variations of Hg concentrations and deposition fluxes were observed,with the highest VWM levels of THg,DHg and PHg occurring in winter and the lowest value occurring in summer. And the RHg concentrations in precipitation in winter and spring were significantly higher than those found in summer and autumn. The variations of deposition fluxes of THg,DHg,Me Hg,DMe Hg had a similar seasonal trend with the rainfall,decreasing from spring to summer and to autumn and then to winter. The maximum deposition fluxes of RHg also appeared in spring and the minimum value occurred in winter. The wet deposition of Hg in Jinyun Mountain was influenced by rain amount,rainfall frequency and other meteorological conditions. Hg levels in the precipitation were also affected by human activities.