Avaliação da bioacumulação de metais tóxicos em ostras, em condições simuladas do descarte da água produzida no mar
The Produced Water (PW) is one of the oil industry main problems due to its large production volume and high complexity. To carry out its disposal in marine environments it is necessary the removal of toxic substances present in the environment, among these substances are metals. Metals when pres...
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| Formato: | Dissertação |
| Idioma: | por |
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| Acesso em linha: | https://repositorio.ufrn.br/jspui/handle/123456789/26314 |
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| Resumo: | The Produced Water (PW) is one of the oil industry main problems due to its large
production volume and high complexity. To carry out its disposal in marine
environments it is necessary the removal of toxic substances present in the environment,
among these substances are metals. Metals when present in the aquatic environment,
even at low concentrations, are capable to provocate bioaccumulating in organisms,
mainly the filter bivalve molluscs, such as oysters. The present study aimed to evaluate
the metal quantification in bivalve molluscs (Crassostrea brasiliana), which serve as
marine's waters contamination bioindicators by metals. For this purpose, it was
simulated a real produced water discard from the Potiguar Basin, using distinct
concentrations in sea water from the Areia Preta / RN beach. The physical-chemical
parameters of the water, such as pH, temperature, salinity, dissolved oxygen, total
dissolved solids and conductivity were evaluated daily, as well as the tissue of oysters
exposed to this citaded conditions. In order to determine the metals Cadmium, Cobalt,
Copper, Nickel and Lead, the samples were decomposed with a closed system assisted
by microwave radiation using Inductively Coupled Plasma Optical Emission
Spectrometry (ICP-OES) for quantification. A decrease in the concentration of all
metals in water over time was observed, as expected, according to evidenced by their
absorption by oysters. In an environment with higher water content, this absorption is
limited. In aquaria containing the highest concentration of produced water, survival was
only 70 hours. It was also observed that with a lower concentration of PW and metals in
the medium, higher was removal's rate. The results obtained after oyster analysis
showed that how lower metal's concentration in water, greater the oysters absorption
potential. Therefore, it is concluded that oyster exposure tests in front of the produced
water show that these can function as indicative species for contamination of aquatic
environments and Inductively Coupled Plasma Optical Emission Spectrometry
technique was efficient in determination of metals in the studied matrixes, showing
good linearity (r2>0.998 for all metals determined with DPR <5%) and quantification
limits between 0.0003 and 0.0045 mg L-1. |
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