Desenvolvimento de metodologia para determinação de Co, Cr, Fe, Mn, Ni, Se e V em amostras de água produzida da indústria do petróleo através da técnica ICP OES utilizando digestão por micro-ondas
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Data
2015-04-08
Autores
Penha, Taiane Rodrigues
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Universidade Federal do Espírito Santo
Resumo
The disposing or reuse of crude oil produced water is difficult because of the environmental impacts caused by presence of high salinity and toxic components, or by the risk of obstruction on the production columns due to crust formation, that cause reduced crude oil production and huge losses to extraction process. Thus, knowledge of chemical composition of these waters is very important. The method proposed in this work is intended for determining trace elements (Co, Cr, Fe, Mn, Ni, Se and V) in crude oil produced water samples by inductively coupled plasma optical emission spectrometry (ICP OES) using microwave-assisted acid digestion for preparing the samples (15g of sample and 2mL of concentrated HNO3). Analytical curve in 2% v/v HNO3 was adopted as calibration method after verifying that is not necessary to use salinity for matrix matching. For element Ni there is no need of using internal standard, for elements Co, Cr, Fe, Mn and V the best results were achieved by using Sc as internal standard. For element Se, the use of Y as internal standard is recommended. The detection limits obtained were Co 0.67, Cr 1.2, Fe 2.3, Mn 0.49, Ni 1.9, Se 3.7 and V 5.5 µg L-1; and the limits of quantification were Co 2.2, Cr 4.0, Fe 7.7, Mn 1.6, Ni 6.5, Se 12.4 and V 18.3 µg L-1. Procedure accuracy was verified through recovery tests at two concentration levels (40 e 80 µg L-1) and analysis of reference certified materials SLEW-2 estuarine water and NASS-5 seawater. Good recovery contents were achieved and there was no significant difference (95% confidence) between obtained results and the certificate values for the reference materials.
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Palavras-chave
Trace elements , Produced water , Acid digestion , Microwave , ICP OES , Elementos traços , Microondas , Espectrometria de emissão óptica por plasma acoplado indutivamente , Água produzida , Digestão ácida
Citação
PENHA, Taiane Rodrigues. Desenvolvimento de metodologia para determinação de Co, Cr, Fe, Mn, Ni, Se e V em amostras de água produzida da indústria do petróleo através da técnica ICP OES utilizando digestão por micro-ondas. 2014. 76 f. Dissertação (Mestrado em Mestrado em Química) – Universidade Federal do Espírito Santo, Vitória, 2014.