Caracterização granulométrica e mineralógica dos sedimentos como suporte para análise de contaminação ambiental em nascentes do rio Subaé, Feira de Santana (BA)

Cruz, Maria Alexandra Santivanez; Santos, Leila Thaise Santana de Oliveira; Lima, Lilian Graicy Lima Morais; Jesus, Taise Bomfim de

doi:10.5327/z0102-9800201300010005

Cited by 11 publications

(7 citation statements)

References 11 publications

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“…Where: Cn is the metal concentration in sediment (mg Kg -1 ), Cb is the base concentration (mg Kg -1 ), in other words, the metal background value based on the average shale composition and 1.5 is a correction factor to background data variables due to lithogenic effects (Cruz, 2013). …”

Section: Data Treatmentmentioning

confidence: 99%

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Assessment of heavy metal contamination in sub-tropical riverine sediments using geoaccumulation index

Silva¹,

Santos²,

Jesus³

2024

Ecotoxicol. Environ. Contam.

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Heavy metal determination in surface sediment allows pollutant assessment when the detection in the water column is not possible. Geoaccumulation Index (Igeo) and the Sediment Quality Guidelines (SQGs) were used to quantitatively evaluate the degree of heavy metal contamination in fluvial sediments. Both of these methods had already been used by several authors and the generated indexes allowed a good comparison parameter. In the present study, heavy metal in sediments (Mn, Zn, Cd, Cr, Cu, Pb and Ni) were analyzed in 14 sampling points, distributed in the upper watercourse of Subaé river, Feira de Santana -BA, in two field campaigns in order to compare dry and wet seasons. The quantification of heavy metal contents was measured by flame atomic absorption spectrometer. The heavy metal levels in the sampling points were low when compared to the global reference values for world sediments. Cadmium concentrations were always below the detection limit of the used spectrometer, and the relative abundance of the studied metals was the following: Mn>Zn>Pb>Cu>Cr>Ni. The variation range of each element concentrations was: Mn 69.3 and 266 mg Kg -1 ; Zn 30.7 and 426 mg Kg -1 ; Pb 6.00 and 63.6 mg Kg -1 ; Cu 4.26 and 66.2 mg Kg -1 ; Cr 3.24 and 52.9 mg Kg -1 ; Ni 1.96 and 24.7 mg Kg -1 . These results are indicating low contamination risk to biota, despite of the fact that some points presented moderate risk of toxicity. The Igeo ranged from unpolluted (Zn, Mn, Cr, and Ni) to slightly polluted (Pb and Cu) in the assessed sediments. The different approaches to geochemical information treatment allow a wide and coherent debate about the environmental risk of heavy metals from anthropogenic diffuse sources.

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Section: Data Treatmentmentioning

confidence: 99%

“…This index establishes the relation among the metal contents found in the analyzed area and an equivalent reference value to the world average shale for metals associated with clay which allows the calculation of the contamination level of different areas (Cruz, 2013).…”

Section: Data Treatmentmentioning

confidence: 99%

Assessment of heavy metal contamination in sub-tropical riverine sediments using geoaccumulation index

Silva¹,

Santos²,

Jesus³

2024

Ecotoxicol. Environ. Contam.

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“…The most important substrates for metal retention must have a high cation exchange capacity. Kaolinite (Al 2 SiO 5 (OH) 4 ), which is a clay mineral commonly found in tropical soils, and is part of the Descoberto reservoir sediment samples, has a known low adsorption capacity [38], which may allow the dissolution of mercury ions in the water column. Thereby, the aluminosilicates of the region can act as a support for Hg [11], contributing to its accumulation in DREPA's lentic environment, which demonstrates that agricultural activity and deforestation are factors that also contribute to the accumulation of THg in the sediments of the Discovery lake.…”

Section: Qz Kln Ilt Gbs Rt Gth Ant Spn Cal Dlm Hemmentioning

confidence: 99%

Evaluation of Total Mercury in Sediments of the Descoberto River Environmental Protection Area—Brazil

Portela

Souza

Tonhá

et al. 2019

IJERPH

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To evaluate the total mercury accumulation (THg) in the Descoberto river basin environmental protection area (DREPA), nine sediment and water samples were collected from the Descoberto reservoir (lentic environment), and 23 in its tributaries (lotic environment), which are located in a densely urbanized area within the Descoberto river watershed, Brazil. The following physicochemical parameters of water were determined: dissolved oxygen (DO); hydrogen potential (pH); total dissolved solids (TDS); nitrate (NO3−); chloride (Cl−); temperature (T); sulfate (SO42−), and in sediment, the concentration of total mercury (THg) and volatile material (VM) was determined. THg concentrations in sediments showed a significant difference (p = 0.002) between tributaries (0.03 µg g−1 ± 0.02) and reservoir (0.08 µg g−1 ± 0.04), indicating accumulation in the lentic environment. Most of the results evaluated for ecotoxicological risks presented values below the concentration, at which adverse effects would rarely be observed, ERL (effects range low). However, in relation to the enrichment factor (EF), applied to identify the anthropogenic contribution, the results indicate that most of the samples are moderately polluted through atmospheric deposition due to vehicular traffic and agriculture. These results show that the likelihood of methylation in the lentic environment is higher than in the lotic environment.

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“…Sediments with smaller particles have higher adsorption capacity. Consequently, they have a greater potential of environmental contamination, because the metals retained in these sites are more labile 18,19 .…”

Section: Physical-chemical Characteristics Of the Sedimentmentioning

confidence: 99%

Evaluation of pseudo-total and labile metals (Cu, Cr, Ni, Mn, Pb and Zn) in surface sediments at the mouth of tributaries of the Itaipu Reservoir, Brazil

Costa¹,

Lopes

Fonseca

et al. 2018

Eclet. Quim. J.

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Sediments are reservoirs for a variety of substances widely used as indicators of pollution in aquatic environments. In this research was carried out the evaluation of the concentration of metals in the pseudo-total and labile fractions in surface sediments at the mouth of four main tributaries of the Itaipu Reservoir. Three samplings were performed between February 2014 and March 2015 using Petersen type dredger. The determination of metals occurred by atomic absorption spectrometry and physical-chemical parameters by gravimetric and potentiometric techniques. The samples presented neutral to slightly alkaline character and homogeneous pHs. It was observed the predominance of the clay fraction and the occurrence of variable organic matter between the points. In the labile fraction, only the copper content reached concentrations higher than the thresholds effects levels (TEL) at all sampling points. In the pseudo-total fraction, some sites presented for Cr, Pb and Zn TEL level. For Ni, values of probable effects level (PEL) were verified and for Cu, concentrations in severe effect level (SEL) were reported according to the international sediment classification criteria adopted by the National Oceanic and Atmospheric Administration (NOAA).

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Caracterização granulométrica e mineralógica dos sedimentos como suporte para análise de contaminação ambiental em nascentes do rio Subaé, Feira de Santana (BA)

Cited by 11 publications

References 11 publications

Assessment of heavy metal contamination in sub-tropical riverine sediments using geoaccumulation index

Assessment of heavy metal contamination in sub-tropical riverine sediments using geoaccumulation index

Evaluation of Total Mercury in Sediments of the Descoberto River Environmental Protection Area—Brazil

Evaluation of pseudo-total and labile metals (Cu, Cr, Ni, Mn, Pb and Zn) in surface sediments at the mouth of tributaries of the Itaipu Reservoir, Brazil

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