Banca de DEFESA: PAULA RAFAHELA SILVA DOS SANTOS

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : PAULA RAFAHELA SILVA DOS SANTOS
DATA : 20/06/2018
HORA: 14:00
LOCAL: Sala de Videoconferência 04 - IMD
TÍTULO:

EVALUATION OF INORGANIC AND ORGANIC COMPOUNDS IN ROAD DEPOSITED SEDIMENT OF THE METROPOLITAN REGION OF NATAL (RN)

PALAVRAS-CHAVES:

RDS. Bed sediment. HPAs. N-Alkanes and Metals.

PÁGINAS: 79
GRANDE ÁREA: Engenharias
ÁREA: Engenharia Sanitária
RESUMO:

Road-deposited sediment (RDS) poses a potential risk to human health and the fluvial environment, due to its association with a wide range of organic and inorganic pollutants. The pollutants associated with the RDS object of this study were heavy metals and organic compounds such as n-alkanes and polycyclic aromatic hydrocarbons (PAHs). The main RDS associated pollutants are heavy metals and organic compounds such as n-alkanes and polycyclic aromatic hydrocarbons (PAHs). These pollutants are derived from vehicular emissions, exhaust particles, lubricating oil residues, tires, brakes, bodywork, asphalt waste and pavement wear. The Pitimbu river drains through the metropolitan region of Natal-Brazil, where it is intercepted by three heavy-traffic highways. At these interception points, RDS is transferred to the river environment by surface runoff during precipitation events. This research is aimed at evaluating the presence of organic and inorganic compounds in SDR and bed sediment samples in these areas. It was analyzed heavy metals (Cd, Cr, Cu, Fe, Mn, Ni, Pb and Zn), organic compounds n-Alkanes, and the 16 most significant Aromatic Polycyclic Hydrocarbons (PAHs). Metal analysis was done by using Atomic Absorption Spectrophotometry flame mode (FAAS) and n-Alkanes and HPAs by Gas Chromatography coupled to a mass spectrometer detector (CG-MS). In addition, a possible correlation between substances and the sediment (SDR and river bed) was investigated. Observed metals concentrations were (mg/kg): copper (33.93 ± 40.51), cadmium (0.77 ± 1.87), lead (36.43 ± 39.12), chromium (9.8 ± 13.28), Manganese (42.18 ± 43.00), zinc (25.60 ± 44.41), iron (10373 ± 6976) and nickel (<LQ). The n-alkanes total sum (nC8 to nC39) varied between 6.04-42.88 mg/kg. Pearson analysis demonstrated that Cu, Mn, Fe, Pb, Cr and Zn were correlated, indicating that these compounds were possibly provided by a common source. The n-Alkans analysis showed profiles distribution with low (n-C8 to n-C15) and high (n-C20 - n-C39) molecular weight chains. The IPC revealed that sediment samples received n-alkane contributions from petrogenic and biogenic sources. The total HPA concentrations ranged from 0.221-2.789 mg/kg. Measured individual PAHs rates for these compounds showed lower values than the maximum levels established by the CONAMA 454/12 resolution. Finally, this study revealed the effect of anthropogenic (vehicular) sources in sediment, which adversely impacts the fluvial environment.

MEMBROS DA BANCA:
Externo ao Programa - 1913849 - EDGAR PERIN MORAES
Externo à Instituição - EDSON CEZAR WENDLAND - USP
Externo à Instituição - GLAUBER JOSE TUROLLA FERNANDES - CTGás
Presidente - 1242829 - LUCIO FLAVIO FERREIRA MOREIRA
Externo à Instituição - MARCO ANTÔNIO CALAZANS DUARTE - IFRN