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Type: Artigo
Title: Mcr-als Applied To The Quantitative Monitoring Of The Electrodegradation Process Of Atrazine Using Uv Spectra: Comparative Results With Hplc-dad As A Reference Method
Author: Souza
Thalisson S.; Zanin
Hudson G.; Peterlevitz
Alfredo; Baranauskas
Vitor; da Silva
Gilmare A.; Reis
Cesar; Reis
Efraim L.; Teofilo
Reinaldo F.
Abstract: Electrodegradation of atrazine in water was performed using homemade (PA and PB) and purchased (PC) boron-doped diamond anodes. The degradation was monitored off-line by analyzing total organic carbon and high performance liquid chromatography with diode array detector (HPLC-DAD) and at-line by UV spectroscopy. The spectra were recorded every 2 min. The rank deficiency problem was resolved by assembling an augmented column-wise matrix. HPLC was employed to separate the original and byproducts degradation components. Aiming the same goal, multivariate curve resolution - alternating least squares (MCR-ALS) was applied to resolve the UV spectroscopic data. Comparison between HPLC and MCR-ALS separations is presented. By using MCR-ALS the spectra of atrazine and two byproducts were successfully resolved and the resulted concentration profiles properly represented the system studied. The ALS explained variance (R-2) for PA, PB and PC was equal to 99.99% for all of them and the lack of fit for PA, PB and PC were 0.39, 0.34 and 0.54 respectively. The correlation (R) between the recovered and pure spectra were calculate for each electrodegradation, validating the MCR-ALS results. The average R was equal to 0.997. The spectral and concentration profiles described with this new approach are in agreement with HPLC-DAD results. The proposed method is an alternative to classical analyses for monitoring of the degradation process, mainly due to the simplicity, fast results and economy.
Subject: Electrodegradation
Boron-doped Diamond
Multivariate Curve Resolution-alternating Least Squares
Editor: Soc Brasileira Quimica
São Paulo
Citation: Quimica Nova. Soc Brasileira Quimica, v. 39, p. 137 - 145, 2016.
Rights: aberto
Identifier DOI: 10.5935/0100-4042.20160006
Date Issue: 2016
Appears in Collections:Unicamp - Artigos e Outros Documentos

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