Speciation of Phosphorus in an Estuarine System Inside Guanabara Bay, RJ - SE Brazil

Rangel, Carlos Marclei Arruda; Neto, José Antônio Baptista; Lima, Luciana Gomes; Oliveira, Priscilla Soares de

doi:10.2112/si65-202.1

Cited by 3 publications

(2 citation statements)

References 12 publications

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“…However, even values below 1 ng L -1 may pose risks to the aquatic environment (PRAVEENA et al, 2016). Thus, the values at the assessed sited (<LD to 1.6 ng L -1 ) still represent potential concerns and indicate a polluting source resulting in contaminant transport to Guanabara Bay (BAPTISTA NETO et al, 2013;RANGEL et al, 2013). The micropollutants detected in the Maracanã River and Mangue Channel pose a significant risk to both water bodies, especially considering the proposed E2 (0.4 ng L -1 ) and EE2 (0.035 ng L -1 ) limits for water bodies according to the Directive 2013/39/EC (GILBERT, 2012;CUNHA et al, 2016).…”

Section: Resultsmentioning

confidence: 97%

Endocrine disruptors, estrogenic activity by the YES bioassay, and acute toxicity in Southeastern Brazil metropolitan surface waters

Nascimento¹,

Oliveira-Santos²,

Cunha³

et al. 2022

Geochim. Bras.

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This study aimed to determine endocrine disruptors in urbanized rivers Maracanã and Mangue Channel in Rio de Janeiro the second most populated city in Brazil. Bisphenol A, 17β-estradiol, estriol, and 17α-ethinylestradiol were determined by high-performance liquid chromatography with a diode array detector and fluorescence detector In addition, the evaluation of estrogenic activity was performed by the YES bioassay (Yeast estrogen screen) with the Saccharomyces cerevisiae yeast, and acute toxicity assays were performed using Daphnia similis and Vibrio fischeri. Estrogenic activity in the water samples ranged from below the limit of detection (<LD) to 1.6 ng L-1, while bisphenol A ranged from 22.3 to 1325.2 ng L-1 and estrogens 17β-estradiol from <LD to 55.2 ng L-1, estriol from <LD to 313.7 ng L-1 and 17α-ethinylestradiol, from <LD to 409.4 ng L-1. The acute toxicity was not detected in both analyzed organisms. The present study indicates a serious level of pollution by the compounds evaluated with significant risks to the aquatic ecosystem, mainly for Guanabara Bay which receives urbanized river discharge. Therefore, recommending the need for systematic monitoring and mitigating actions in these water bodies.

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Section: Resultsmentioning

confidence: 97%

Endocrine disruptors, estrogenic activity by the YES bioassay, and acute toxicity in Southeastern Brazil metropolitan surface waters

Nascimento¹,

Oliveira-Santos²,

Cunha³

et al. 2022

Geochim. Bras.

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“…The lack of phosphorus fractionation data in estuarine sediments of Guanabara bay is surprising. There are few studies regarding the inorganic fractions of sedimentary phosphorus in estuarine systems of this important Brazilian bay (Rangel et al 2013 ). The study of the transformation dynamics of P fractions is important for a better understanding of the availability of different P fractions in these environments (Yang et al 2012 ).…”

Section: Resultsmentioning

confidence: 99%

Phosphorus fractionation distribution in Guapimirim estuary: SE Brazil

et al. 2016

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The Guapimirim estuary is the main tributary of Guanabara bay and is located in the northeast portion. Although it is protected, this estuary has been experiencing strong anthropogenic pressure, which has led to changes in the natural characteristics. Large amounts of sewage are dumped into the bay through tributaries, thereby changing the water and bottom sediment quality. One of the main elements of sewage is phosphorus. Despite its importance to life, a high concentration of this nutrient in the environment can result in eutrophication. This work describes the phosphorus distribution in its different fractions in the bottom sediment at 16 stations located in the main channel of the Guapimirim estuary. These results are correlated with data on grain size, organic matter and calcium carbonate content in the bottom sediment and with physicochemical parameters of the bottom water. The grain size decreases toward the mouth of the estuary, whereas the organic matter and carbonate content increase. The salinity increases significantly at 3.5 km upstream from the mouth, where there is also a notable increase in fine sediments; the same site is the mean position of the salinity front. The temperature and pH increase in the same direction. The Pinorg-total ranges between 3.18 and 7.13 µmol g−1, increasing toward the mouth. The same trend is observed for the other phosphorus fractions P-Ca, P-Fe and P-f.a., which range from 0.68 to 1.91, 0.79 to 1.71 and 0.03 to 0.93 µmol g−1, respectively. The P-Ca and P-Fe fractions are the most representative in the Pinorg-total, occurring at 26.3 and 26.0 %, respectively.

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Environmental assessment concerning trace metals and ecological risks at Guanabara Bay, RJ, Brazil

Aguiar

Abuchacra

Neto

et al. 2018

Environ Monit Assess

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Three-stage sequential extraction BCR was applied to surface sediments from the west part of Guanabara Bay to assess the mobility of Zn, Cu, Pb, Ni, Cr, and Mn. Results were satisfactory for the analysis of certificate standard material (BCR 701), with recoveries between 71 (Cu) and 123% (Cr). Evaluation of organic matter composition classified the area as eutrophic (CHO:PRT > 1), with aged organic detritus at some stations. Zn exhibited by far the greatest bioavailability, with 43.49% of its concentrations associated with the exchangeable fraction. Cu and Cr showed stronger affinity for organic matter, with 51.18 and 48.73% of their concentrations, respectively, bounded to the oxidizable fraction. Pb presented higher concentrations in the reducible fraction (45.41%). The strongest lithogenic contribution was shown by Ni (31.91%) and Mn (35.44%). PCA clearly showed the determinant role of organic matter and fine sediments in the distribution of metals in the study area and also a common source for these elements, with the exception of Cu. Risk Assessment Code (RAC) established Zn as the most concerning element in the study area. The decreasing mobility order, based on the sum of the three extractable fractions of BCR, was Pb > Cu > Cr > Zn > Ni > Mn. The comparison of the results with sediments quality guidelines (SQG) proved fractionation to be mandatory in the evaluation of effective ecological risk concerning trace elements in sediments.

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Speciation of Phosphorus in an Estuarine System Inside Guanabara Bay, RJ - SE Brazil

Cited by 3 publications

References 12 publications

Endocrine disruptors, estrogenic activity by the YES bioassay, and acute toxicity in Southeastern Brazil metropolitan surface waters

Endocrine disruptors, estrogenic activity by the YES bioassay, and acute toxicity in Southeastern Brazil metropolitan surface waters

Phosphorus fractionation distribution in Guapimirim estuary: SE Brazil

Environmental assessment concerning trace metals and ecological risks at Guanabara Bay, RJ, Brazil

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