CO2_2016 - page 19

KEYWORDS: PAHs, runoff, sediment, urban drainage.
Abstract
The pollution in aquatic environments can be indicated by high concentrations of PAHs. This study is
aimed to evaluate the possible sources of contamination of PAHs in the São Gonçalo channel sediments
collected from the areas of receipt rainwater systems. It was possible to identify sources of contamination and hydrocarbon levels in
points studied. The PAHs concentrations found were considered relatively high, in the point located within the Pepino Channel, near
the arrival at the São Gonçalo Channel, confirming the impact of urban runoff in the city's drainage system and how and its
consequent impact on water resources.
Polycyclic aromatic hydrocarbon
determination (PAHs) transported
by storm water drainage in the Pelotas region
and its levels in São Gonçalo Channel
INTRODUCTION
The São Gonçalo channel is located in the city of Pelotas in
Rio Grande do Sul state and is considered as one of several
contaminants entry point coming from human actions (1).
The urban areas rely on the system of runoff canals to capture
rainfall water that promote urban runoff, process dragging
contaminants that include various organic and inorganic
compounds, mainly from the traffic of vehicles for along the
canals, streams and rivers (2).
PAHs are contaminants that enter the water column carried
by the urban runoff, incorporating to particulate matter in
the organic matter (3) they end up being deposited in the
bed of these sites, adding up the bottom sediments, which
act as a reservoir for the hydrophobic contaminants (4)
and can provide sources of petrogenic, pyrolytic, biogenic
an diagenesis of sedimentary organic material (5). The
finer sediments (silt + sand) generally contain PAHs (6) and
properties as pH, conductivity and dissolved organic carbon
control the solubility of these contaminants (7). PAHs have
characteristics like hydrophobicity and low reactivity to the
environment (3). These are currently classified by the US
Environmental Protection Agency (EPA) and the European
Community (EU) - sixteen PAHs, (the Table 1) considered as
priority pollutants because they have characteristics like
mutagenic and tumor actions in biological systems (8).
This study aims to evaluate the possible sources of this PAH
contamination in the sediment of the São Gonçalo channel
derived from urban areas and collected by the rainwater
runoff systems areas and determine the concentrations at
various points along the channel, compare results with the
current legislation and sort the point about the impact on
local biota and the possible dredging.
MATERIALS AND METHODS
PAHs was evaluated and quantify load was carried and its
possible origins in urban storm water runoff channels were
sampled from the three canals running through the urban
area of Pelotas, the Santa Barbara Channel (A),
ANALYTICAL
TECHNOLOGIES
MELINA S. HALL, GISSELE O. MONTENEGRO, GLAUCO R. BETEMPS,
BERNARDO S. VAZ, PEDRO J. SANCHES FILHO*
*Corresponding author
Instituto Federal Sul-Rio-Grandense, Campus Pelotas
Praça Vinte de Setembro, 455 CEP 96015-360 - Centro, Pelotas - RS, Brazil
Pedro J. Sanches Filho
Table 1.
US EPA’s 16 priority-pollutant PAHs and selected physical–
chemical properties (9) US EPA has classified PAHs in italics as
probable human carcinogens (10).
17
Chimica Oggi - Chemistry Today
- vol. 34(2) March/April 2016
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