Abstract
Studies related to heavy metal concentrations in coastal sediments are important to monitor and assess environmental health of estuarine ecosystems. Twenty-eight samples from Parnaíba River Delta, the largest open-ocean delta in the Americas, northeastern of Brazil were tested for heavy metals concentrations (Cd, Cr, Cu, Mn, Ni, Pb, Zn, Al and Fe), grain-size and easily oxidizable carbon. The relations of the heavy metals with sediment composition were evaluated using a multivariate statistical analysis. Sediment pollution assessment was carried out by enrichment factor (EF), geoaccumulation index (Igeo), contamination factor (CF) and potential ecological risk index (PERI). The average concentrations were 0.50 ± 0.09 mg Cd kg−1, 6.95 ± 2.13 mg Pb kg−1, 19.02 ± 8.75 mg Cu kg−1, 23.20 ± 5.04 mg Ni kg−1, 33.52 ± 6.82 mg Cr kg−1, 43.99 ± 7.47 mg Zn kg−1, 165.73 ± 86.71 mg Mn kg−1, 2.93 ± 0.89% to Fe and 3.78 ± 1.17% to Al. The results indicate lower concentrations of heavy metals relative to limit concentrations defined by the Brazilian regulatory framework. The multivariate analysis reflected the binding of heavy metals to clay minerals and organic carbon. The different geochemical indices indicated sediments minimally enriched by metals and a low potential ecological risk level. Our assessment confirms the pristine conditions of Parnaíba Delta protected area to heavy metal contamination, except Igaraçú channel near Parnaíba city.
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This study was supported by the Fundação Cearense de Apoio ao Desenvolvimento Científico e Tecnológico—FUNCAP (Grant no. PR2-0101-00052.01.00/15/PRONEX/FUNCAP/CNPq and no. BP3-0139-00276.01.00/18) and Conselho Nacional de Desenvolvimento Científico e Tecnológico—CNPq (Grant no. 408363/2018-5/ MCTIC/CNPq Nº 28/2018).
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FJDePF: investigation, validation, writing—original draft. conceptualization, funding acquisition, resources, writing—review and editing, formal analysis, project administration. RVM: conceptualization, funding acquisition, supervision, resources, formal analysis, writing—review and editing, project administration. DVS: investigation, validation. RFPJ: investigation, validation. JMCM: methodology, investigation, validation. Writing—review and editing. FGCG: methodology, formal analysis, validation. AG: writing—review and editing, investigation, resources. RNPT: methodology, investigation, validation.
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de Paula Filho, F.J., Marins, R.V., Santos, D.V. et al. Assessment of heavy metals in sediments of the Parnaíba River Delta in the semi-arid coast of Brazil. Environ Earth Sci 80, 167 (2021). https://doi.org/10.1007/s12665-021-09456-2
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DOI: https://doi.org/10.1007/s12665-021-09456-2