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International Journal of Photoenergy
Volume 2017 (2017), Article ID 6781310, 9 pages
https://doi.org/10.1155/2017/6781310
Research Article

Determination of Ketorolac in the Effluent from a Hospital Treating Plant and Kinetics Study of Its Photolytic Degradation

Laboratorio de Análisis Instrumental, Facultad de Química, Universidad Autónoma del Estado de México, Paseo Colón Esq. Paseo Tollocan, 50120 Toluca, MEX, Mexico

Correspondence should be addressed to Jorge Javier Ramírez García

Received 8 June 2017; Revised 20 November 2017; Accepted 23 November 2017; Published 31 December 2017

Academic Editor: Juan M. R. Rodriguez

Copyright © 2017 Hector Hugo Ortega Soto et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

In this work, two specific, sensitive, and rapid analytical methods were developed. One of them was for the determination of ketorolac in a hospital wastewater treatment plant where there is no interference with other organic substances; the other one was for the determination of the degradation kinetics in aqueous medium. Ketorolac was extracted from wastewater samples through solid-phase extraction (SPE) cartridges, then it was identified and quantified by high-performance liquid chromatography (HPLC). Ketorolac was detected in concentrations between 0.1376 and 0.2667 μg/L. Photolytic degradation was performed on aqueous solutions of ketorolac tromethamine reference substance, at a concentration of 50 μg/mL. Samples were in direct contact with ultraviolet light in a dark chamber, equipped with two mercury lamps (254 nm) at a radiation source of 15 W. The results of the photolytic degradation were adjusted to a first-order model, obtaining a half-life of 4.8 hrs.