Banca de DEFESA: Maria Graziele Lobato da Silva

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : Maria Graziele Lobato da Silva
DATE: 14/09/2023
TIME: 14:00
LOCAL: teams
TITLE:

Gaseous mercury in urban atmosphere: overview of the scientific production and investigation of the presence and dispersion in highway of Brasília, DF

KEY WORDS:

Gaseous mercury, atmosphere, vehicles, road, dispersion

PAGES: 63
BIG AREA: Outra
AREA: Multidisciplinar
SUMMARY:

Automotive vehicles are considerable sources of gaseous Hg emissions to the atmosphere due to the burning of fossil fuels, contributing significantly to the increase of gaseous Hg emissions in urban centers. In this work, a scientometric evaluation was initially carried out with a view to the status of scientific production on Hg in the atmosphere in terms of research lines. Scientometrics revealed that traditionally studies on atmospheric Hg are carried out on deposition in water and sediments, pollution by particulate matter in soil, speciation, and dynamics of Hg in the atmosphere. In terms of gaseous Hg, the last decade points out as the peak of research in the area, with studies on: Hg emitted in combustion processes, Hg dynamics in atmosphere, metal pollution in particulate matter, gaseous Hg deposition, and anthropogenic and urban emissions of gaseous Hg. In a second step, we determined the concentrations of gaseous mercury in the vicinity of DF-002 located in the central area of Brasilia, Federal District, characterized as an urban center with heavy traffic. The data were processed with the application of geostatistical tools using ordinary kriging to propose a prediction of the distribution of gaseous mercury concentrations, and indicative kriging to estimate areas of influence of mercury dispersion. Ordinary kriging pointed out two areas of hot spots of gaseous Hg concentration with average values of gaseous Hg concentration of 1 ng/m3, reaching a maximum of 6 ng/m3, and indicative kriging pointed out two other areas with a tendency of accumulation of Hg above the limit of 1.3 ng/m3 one at each end of the highway. The values found are below the risk limits indicated by the World Health Organization, however they express alertness to prolonged human exposure to gaseous mercury in urban environments.

COMMITTEE MEMBERS:
Interno - ***.875.257-** - EDUARDO CYRINO DE OLIVEIRA FILHO - UnB
Interna - 3049879 - ERINA VITORIO RODRIGUES
Externo à Instituição - FELIPE ANDRÉ DOS SANTOS - UNESP
Presidente - 1644727 - LUIZ FABRICIO ZARA
Externo à Instituição - ROMULO JOSE DA COSTA RIBEIRO - UFRJ