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• de Souza, V
• Rodrigues, K
• Pedroza, E
• Melo, R
• Lima, V
• Hazin, C
• Almeida, M
• Nascimento, R
• [+] on Google Scholar
• de Souza, V
• Rodrigues, K
• Pedroza, E
• Melo, R
• Lima, V
• Hazin, C
• Almeida, M
• Nascimento, R
• [+] on PubMed
• de Souza, V
• Rodrigues, K
• Pedroza, E
• Melo, R
• Lima, V
• Hazin, C
• Almeida, M
• Nascimento, R

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Sustainability 2012, 4(10), 2419-2429; doi:10.3390/su4102419

Article

Sedimentation Rate and ²¹⁰Pb Sediment Dating at Apipucos Reservoir, Recife, Brazil

Vivianne L. B. de Souza* , Kélia R. G. Rodrigues, Eryka H. Pedroza, Roberto T. de Melo, Vanessa L. de Lima, Clovis A. Hazin, Mayara G. O. de Almeida and Rízia K. do Nascimento

Centro Regional de Ciências Nucleares (CRCN/CNEN-PE), Av. Professor Luiz Freire 200, 50740-540 Recife, PE, Brazil

* Author to whom correspondence should be addressed.

Received: 20 August 2012; in revised form: 10 September 2012 / Accepted: 11 September 2012 / Published: 27 September 2012

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Abstract: The Apipucos Reservoir is located in Pernambuco-Brazil. Several districts of the metropolitan area use this reservoir to dispose of rubbish, waste and sewage. Dating sediments uses the ²¹⁰Pb from the atmosphere. ²¹⁰Pb is a daughter of the ²²²Rn, which emanates from the soil but is different from that contained in the sediment, which is in balance with the ²²⁶Ra. The chosen model for dating sediments depends on certain conditions: in environments where the amount of sediment can vary, the Constant Rate of Supply (CRS) model is adopted. In environments where the sediments can be considered to be constant, a Constant Initial Concentration (CIC) model is applied. A 70 cm long and 5 cm internal-diameter wide core was used for sediment sampling. Samples were dried at 105 °C, and about 5 g dry material was dissolved with acids. The ²¹⁰Pb and ²²⁶Ra content was determined by their radioactive descendants’ concentrations. For the second sampling point, both models could be used. The results showed an increase in sedimentation rate over the last 50–60 years. We could conclude that the top sediment interval had been there 30 years ago. We could decide that the CRS was the best applicable model.

Keywords: sedimentation rate; dating sediments with ²¹⁰Pb; CRS and CIC models

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