Distribuição e assinatura isotópica de Pb em sedimentos de fundo da Foz do Rio Guamá e da Baía do Guajará (Belém - Pará)

Santos, Suziane Nascimento; Lafon, Jean Michel; Corrêa, José Augusto Martins; Babinski, Marly; Dias, Fabiana; Taddei, Maria Helena Tirolo

doi:10.1590/s0100-40422012000200004

Cited by 20 publications

(39 citation statements)

References 12 publications

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“…The mineralogical composition of the clay fraction of the bottom sediments showed a predominance of kaolinite, smectite, and illite clayminerals, similar to the composition described in previous studies (Santos et al 2012). …”

Section: Resultssupporting

confidence: 86%

“…The isotopic compositions were then determined in the Isotope Geology Laboratory (Pará-Iso) at the Geosciences Institute of the Universidade Federal do Pará, according to the experimental procedure described by Lafon et al (1993) and Santos et al (2012). One gram of each sediment sample was leached with 3 mL of HNO 3 5N and stirred during 24 hours, and then leached using HBr 8N.…”

Section: Methodsmentioning

confidence: 99%

“…(Fig. 3), including the data by Santos et al (2012), and a sample from Mocajatuba River, which represents sediments with the lowest isotope ratio and highest Pb content in the Belém river system ( 206 Pb/ 207 Pb = 1.162; [Pb] = 89 mg kg -1 ; Moura et al 2004), the Carnapijó River bottom sediments define a relatively homogeneous area. In addition, they have high isotopic ratios that overlap with the field of samples from Guamá River obtained by Santos et al (2012).…”

Section: Pb Al Fe and Organic Matter Content In The Sedimentsmentioning

confidence: 99%

“…3), including the data by Santos et al (2012), and a sample from Mocajatuba River, which represents sediments with the lowest isotope ratio and highest Pb content in the Belém river system ( 206 Pb/ 207 Pb = 1.162; [Pb] = 89 mg kg -1 ; Moura et al 2004), the Carnapijó River bottom sediments define a relatively homogeneous area. In addition, they have high isotopic ratios that overlap with the field of samples from Guamá River obtained by Santos et al (2012). The bottom sediments from the western margin of Guajará Bay are more dispersed and define a wider field, with lower 206 Pb/ 207 Pb ratios and higher or equal Pb contents than those of the previous field samples and partially overlap that defined by the bottom sediment samples of Santos et al (2012).…”

Section: Pb Al Fe and Organic Matter Content In The Sedimentsmentioning

confidence: 99%

“…In addition, the study aimed to assess the contribution of suspended matter as means of transporting anthropogenic-related Pb in Guajará Bay, and to ascertain whether the contents and isotopic composition of Pb previously proposed as geogenic Pb (Santos et al 2012) can be considered as a background for the whole river system of Belém.…”

Section: Introductionmentioning

confidence: 99%

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Distribution and isotopic composition of lead in bottom sediments from the hydrographic system of Belém, Pará (western margin of Guajará Bay and Carnapijó River)

et al. 2016

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This study first aimed to evaluate the effect of human activities on the distribution of lead within the estuarine system of Belém, Pará. This was achieved by studying the concentration and isotopic signature of Pb in bottom sediments from the western margin of Guajará Bay and from Carnapijó River, an area removed from the influence of the city of Belém. Secondly, the contribution of suspended matter in the transportation of anthropogenic Pb in Guajará Bay was evaluated. Third, the content and background isotopic signature of Pb in the hydrographic system of Belém was determined. Isotopic signatures of sediments from the western margin of Guajará Bay confirm an anthropogenic contribution of Pb throughout the entire bay. The Pb accumulation process has become more efficient over the last 10 years, and this can be attributed to the rapid population growth of Belém city. Sediments in Carnapijó River are not affected by human activities, and the average concentration values (Pb = 19.6 ± 3.7 mg kg -1 ) and isotopic signatures ( 206 Pb/ 207 Pb = 1.196 ± 0.004) confirm the background Pb values previously proposed for the river system in the Belém region. The isotopic signatures of suspended matter on the eastern ( 206 Pb/ 207 Pb = 1.188) and western ( 206 Pb/ 207 Pb = 1.174) margins of Guajará Bay show that suspended matter is an efficient Pb transportation mechanism of domestic and industrial wastewater from Belém to the western margin of the Bay due to tidal effects at the confluence with Guamá River.

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Section: Resultssupporting

confidence: 86%

Section: Methodsmentioning

confidence: 99%