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Total LABs total linear alkylbenzenes, Total n-alk total n-alkanes, Total AHs total aliphatic hydrocarbons (n-C,2—-n-C34), UCM unresolvec complex mixture, CPI carbon preference index (n-Cj5—n-C33), DP dominant peaks, LMW-PAH low molecular weight PAHs (sum of 2 and ° rings PAHs), HMW-PAHs high molecular weight PAHs (sum of 4-6 rings PAHs), NC not calculated Table 1 Sediment characteristics, total concentrations of LABs, AHs and PAHs including the diagnostic criteria for sediments collected i Mucuripe and Pecém harbors

Table 1 Total LABs total linear alkylbenzenes, Total n-alk total n-alkanes, Total AHs total aliphatic hydrocarbons (n-C,2—-n-C34), UCM unresolvec complex mixture, CPI carbon preference index (n-Cj5—n-C33), DP dominant peaks, LMW-PAH low molecular weight PAHs (sum of 2 and ° rings PAHs), HMW-PAHs high molecular weight PAHs (sum of 4-6 rings PAHs), NC not calculated Table 1 Sediment characteristics, total concentrations of LABs, AHs and PAHs including the diagnostic criteria for sediments collected i Mucuripe and Pecém harbors

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Fig. 1 Sites of sediment sampling in Mucuripe and Pecém harbors
Fig. 1 Sites of sediment sampling in Mucuripe and Pecém harbors
Fig. 2 PAH cross plots for the ratios: IP/(IP + BghiP) versus BaA/ (BaA + Chry) for the sediments collected in Mucuripe and Pecém harbors. JP indeno[1,2,3-c,d]pyrene, BghiP benzo(ghi)pery- lene, BaA benzo[aJanthracene, Chry chrysene
Fig. 2 PAH cross plots for the ratios: IP/(IP + BghiP) versus BaA/ (BaA + Chry) for the sediments collected in Mucuripe and Pecém harbors. JP indeno[1,2,3-c,d]pyrene, BghiP benzo(ghi)pery- lene, BaA benzo[aJanthracene, Chry chrysene
Significant correlations are marked in bold In order to observe associations between the hydrocar- bon distribution and sediment characteristics, Spearman’s correlation coefficients were calculated assuming that the data do not present a Gaussian distribution. The results showed significant correlations (p < 0.05) for the fine sediments with AHs and also for all hydrocarbons with calcium carbonates and organic matter (Table 2). Hydro- carbons are compounds known for their ability to adsorb on organic or inorganic particles and precipitate onto the superficial sediments surface (Chiou et al. 1998). The data suggest that the depositional zones created by jetties in the sheltered areas of both harbors promote the sedimentation of fines particles and organic matter, including biogenic carbonates, controlling thus the occurrence and distribution of these compounds.
Significant correlations are marked in bold In order to observe associations between the hydrocar- bon distribution and sediment characteristics, Spearman’s correlation coefficients were calculated assuming that the data do not present a Gaussian distribution. The results showed significant correlations (p < 0.05) for the fine sediments with AHs and also for all hydrocarbons with calcium carbonates and organic matter (Table 2). Hydro- carbons are compounds known for their ability to adsorb on organic or inorganic particles and precipitate onto the superficial sediments surface (Chiou et al. 1998). The data suggest that the depositional zones created by jetties in the sheltered areas of both harbors promote the sedimentation of fines particles and organic matter, including biogenic carbonates, controlling thus the occurrence and distribution of these compounds.
A Wagener et al. (2010), B Silva et al. (2013), C Wagener et al. (2011), D Cavalcante et al. (2009), E This study, F Medeiros et al. (2005) G Pietzsch et al. (2010), H Martins et al. (2012), J Medeiros and Bicego (2004a), J Bicego et al. (2006), K Medeiros and Bicego (2004b), L Silvé and Bicego (2010), M Wagener et al. (2012), N Brasil (2012), O Choueri et al. (2009) * Threshold effects level b Probable effects level Table 3 Compilation of hydrocarbons in marine and coastal sediments from northeast, southeast and South of Brazil and Sediment Quality Guidelines
A Wagener et al. (2010), B Silva et al. (2013), C Wagener et al. (2011), D Cavalcante et al. (2009), E This study, F Medeiros et al. (2005) G Pietzsch et al. (2010), H Martins et al. (2012), J Medeiros and Bicego (2004a), J Bicego et al. (2006), K Medeiros and Bicego (2004b), L Silvé and Bicego (2010), M Wagener et al. (2012), N Brasil (2012), O Choueri et al. (2009) * Threshold effects level b Probable effects level Table 3 Compilation of hydrocarbons in marine and coastal sediments from northeast, southeast and South of Brazil and Sediment Quality Guidelines
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