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Abstract Title: Mercury Wet Deposition Monitoring in Urban and Highly Industrialized Area in Brazil
Company/Institution: University of Campinas - UNICAMP
Session: Special Session - Mercury in the Southern Hemisphere
Day and Session: Wednesday 27th July - Session One
Start Time: 07:00 UTC

Abstract Information :

Data of mercury wet deposition in Southern hemisphere are scarce, mainly in urban and industrial areas and over a long monitoring period. The Campinas Metropolitan Region (CMR) is the second more populated and industrialized region of the S?o Paulo state, which accounts for ~30% of the Brazilian GDP. From 04/2019 to 12/2020, we collected 66 event-based precipitation samples at the University of Campinas campus (22o49?5.747??S; 47o4?5.174??W), in which total Hg concentration [THg] were determined. Each bulk precipitation event was collected in an in-lab made collector. The Hg sampling train consisted of a borosilicate glass funnel (18 cm ?) and a 1 L borosilicate glass bottle. Samples collection and analysis were performed according to US-EPA Method 1631. LOD and LOQ (CVAFS analytical method) were 0.07 and 0.23 ng L-1, respectively. Bottle blanks and field blanks were systematically analyzed.
[THg] for individual events ranged 0.33-34.63 ng L-1, with a volume weight mean of 6.95ñ0.81 ng L-1. Rain events deposition ranged from 0.004 to 0.33 æg m-2 event-1, whereas annual deposition flux was 7.18 æg m-2 y-1. VWM [THg] was relatively low when compared to data reported in the literature for many polluted urban and industrial regions of the Northern hemisphere, which can be related to the main type of regional industries (transformative and high technology) and energy fuels (hydroelectric and methanol). Nevertheless, annual deposition was on the same order as reported for the same regions of the NH, which can be due to high precipitation in the CMR region (1462 mm/yr). A clear seasonal variation was observed with the highest [THg] during the dry winter, but the highest Hg deposition values during spring and rainy summer.
Characteristics of regional Hg emission sources, local atmospheric transport patterns, and precipitation amount were the main factors that influenced on Hg deposition in Campinas.

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