Abstract
This study investigated the distribution and origin of organic carbon (OC) and aliphatic hydrocarbons (AHs) in sand (≥ 63 μm) and mud (< 63 μm) fractions of the Pina Sound (NE Brazil). Sedimentary OC and AHs were characterized using elemental [(C/N)a ratio], isotopic (δ13C), and molecular (AHs diagnostic ratio) proxies. On a dry weight basis, the average proportions of OC and AH contents in the mud fraction were 88 and 96%, respectively. The distribution of OC in the mud fraction was regulated by inputs from aquatic sources, while in the sand fraction, the distribution was associated with sedimentary mud contents. This reflects the hydrodynamic control on the deposition of low-density suspended particles. The mud fraction contained OC derived from aquatic producers, bacteria, and sewage while plant fragments were prevalent in the sand fraction. Sewage is a major source of oil-derived AHs in the Pina Sound. The mud fraction exhibited a high (> 100 μg/g dw) concentration of the unresolved complex mixture and a high proportion (31%) of petrogenic n-alkanes. Mud-associated pollutants can be exported to adjacent continental shelf. Geochemical analyses in size-fractionated sediments of the Pina Sound proved to be a useful procedure for better understanding estuarine OC dynamics.
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Funding
BVMC was funded by the Brazilian National Research Council (CNPq, Grant No. 141146/2014-1). PJPS acknowledges a research fellowship (Grant No. 507274/2010-5) from CNPq. GTY is funded by CNPq (Grant No. 310554/2019-5). Chemical analyses were partially funded by CNPq (Grant No. 141146/2014-1) and FACEPE Multiusuários (Grant No. APQ-0388-1.08/10). This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - Brasil (CAPES) Finance Code 001. We also thank Rebecca N Umeed for English language revision.
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Odd-to-even predominance (OEP) curves for n-alkanes extracted from sand (a) and mud (b) sediment fractions. Open circles depict the OEP values in each sample while filled triangles represent median OEP for n-alkanes containing 17 to 35 carbon atoms. (PDF 354 kb)
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da Costa, B.V.M., Santos, P.J.P. & Yogui, G.T. Origin and Distribution of Total Organic Matter and Aliphatic Hydrocarbons in Sedimentary Fractions of a Highly Urbanized, Tropical Estuary. Estuaries and Coasts 44, 1262–1273 (2021). https://doi.org/10.1007/s12237-020-00890-2
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DOI: https://doi.org/10.1007/s12237-020-00890-2