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1 January 2012 Characterization and Distribution of Polycyclic Aromatic Hydrocarbons in Sediments from Suruí Mangrove, Guanabara Bay, Rio de Janeiro, Brazil
Luiz Francisco Fontana, Mirian Araújo Carlos Crapez, Alberto Garcia de Figueiredo Junior, Elisamara Sabadini Santos, Frederico Sobrinho da Silva, Angelo Morgado Ribeiro, Camila C. Martins da Rocha, Annibal Duarte Pereira Netto
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Abstract

Four sediment cores were collected in Suruí Mangrove. Cores 0.30-m long were sliced into small cores corresponding to 0–0.03, 0.05–0.10, 0.10–0.15, 0.15–0.20, 0.20–0.25, and 0.25–0.30-m depths. Polycyclic aromatic hydrocarbons, total organic carbon (TOC), and total sulfur (TS) were determined. Total organic carbon varied between 0.8% and 7.8%, with mean values varying according to sampling location (5.2% for core 1, 3.2% for core 2, 4.2% for core 3, and 2.7% for core 4). Total sulfur also varied in the studied cores with a mean ± standard deviation of 1.1% ± 0.7%. The lowest value (0.01%) was found in core 2 (0.10–0.15 m), and the largest one (2.6%) was observed in core 4 (0.25–030 m). The TOC/TS ratio indicated that most sediments showed reducing characteristics, except for four samples (core 1 of 0.10–0.15 m and 0.25–0.30 m, and core 2 of 0–0.03 m and 0.05–0.10 m). Total PAH concentrations varied between 4.4 and 1387 µg g−1, indicating a local and restricted contamination of parts of the studied area. The highest percentages for total and carcinogenic PAHs and toxic equivalent factors were found in the sediment from core 1 from Suruí Mangrove, with a predominance of benzo[k]fluoranthene, benzo[a]pyrene, and naphthalene. In cores 3 and 4, collected closer to Guanabara Bay, benzo[a]anthracene and benzo[a]pyrene were also found. The sediment in Suruí Mangrove is functioning as a reservoir of compounds that are carcinogenic to the fauna and flora of the mangrove itself, and to the adjacent waters of Guanabara Bay.

Luiz Francisco Fontana, Mirian Araújo Carlos Crapez, Alberto Garcia de Figueiredo Junior, Elisamara Sabadini Santos, Frederico Sobrinho da Silva, Angelo Morgado Ribeiro, Camila C. Martins da Rocha, and Annibal Duarte Pereira Netto "Characterization and Distribution of Polycyclic Aromatic Hydrocarbons in Sediments from Suruí Mangrove, Guanabara Bay, Rio de Janeiro, Brazil," Journal of Coastal Research 28(1A), 156-162, (1 January 2012). https://doi.org/10.2112/JCOASTRES-D-10-00105.1
Received: 12 July 2010; Accepted: 18 November 2010; Published: 1 January 2012
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KEYWORDS
Bay
mangrove
organic carbon
PAHs
sediments
sulfur
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