Document Type

Article

Language

eng

Format of Original

8 p.

Publication Date

8-6-2013

Publisher

American Chemical Society

Source Publication

Environmental Science & Technology

Source ISSN

0013-936X

Original Item ID

DOI: 10.1021/es400800v

Abstract

The in situ study of the photodegradation of carbofuran deposited on a TiO2 catalyst film under UV light was carried out using the ATR-FTIR technique. The data were analyzed using a Hard–Soft Multivariate Curve Resolution-Alternating Least Squares (HS-MCR-ALS) methodology. Using S-MCR-ALS, four factors were deduced from the evolving factor analysis of the data, and their concentrations and spectra were determined. These results were used to draw qualitative and quantitative analyses of the major products of carbofuran photodegradation. The results of this analysis were in good agreement with GC-MS results and with reported mechanisms. Hard-MCR-ALS was then used to refine the spectra and concentrations, using a multistep kinetic model. The rate constant for the first step in the photodegradation of carbofuran was found to be 2.9 × 10–3 min–1. The higher magnitude of the correlation (96.87%), the explained variance (99.87%) and LOF (3.01), are good indicators of the reliability of the outcome of this approach. This method has been shown to be an efficient approach to study in situ photodegradation of pesticides on a solid surface.

Comments

Accepted version. Environmental Science & Technology, Vol 47, No. 15 (August 6, 2013): 8650-8657. DOI. © 2013 American Chemical Society. Used with permission

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