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

2017 ◽  
Vol 2017 ◽  
pp. 1-9
Author(s):  
Hector Hugo Ortega Soto ◽  
Jorge Javier Ramírez García ◽  
Paula Gamboa Suárez ◽  
Angie Michelle Dávila Estrada
Keyword(s):  
High Performance ◽  
Solid Phase ◽  
Degradation Kinetics ◽  
Treatment Plant ◽  
Order Model ◽  
Dark Chamber ◽  
First Order ◽  
Photolytic Degradation ◽  
Wastewater Samples

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.

Determination of Three Chromium Textile Azo Dyes in Wastewater by SPE-LC-ESI(–)-MS/MS

2018 ◽  
Vol 101 (5) ◽  
pp. 1422-1428
Author(s):  
Florina-Maria Copaciu ◽  
Dorina Simedru ◽  
Maria-Virginia Coman
Keyword(s):  
Azo Dyes ◽  
Solid Phase ◽  
Treatment Plant ◽  
Textile Dye ◽  
Esi Ms ◽  
Dyeing Process ◽  
The Matrix ◽  
Wastewater Samples ◽  
Textile Factory

Abstract In the present work, a procedure to determine three textile azo dyes, chromium-complexes [Nylosan Dark Brown (NDB), Lanasyn Dark Brown (LDB), and Lanasyn Red (LR)], from wastewater using solid-phase extraction (SPE) followed by LC-electrospray ionization negative mode tandem mass spectrometry (LC-ESI(–)-MS/MS) has been developed. The extraction/concentration and recovery degree of these dyes from liquid matrices were done on Strata WAX/NH2 cartridges. The chromatographic separation was performed using a Luna C18 (2) 100Å column by isocratic elution with a methanol–acetonitrile–water (0.2% formic acid and 2 mM ammonium formate) mixture. The linearity, the LOD, and the LOQ were determined for each textile dye. The accuracy, the precision (intra- and inter-day), and the matrix effect were also performed for the validation of the developed procedure. These chromium-complex azo dyes often used in the dyeing process by a textile factory in Romania were monitored in the influent and effluent wastewater from a treatment plant situated in its area. Applying the developed SPE-LC-ESI(–)-MS/MS procedure, the following textile dyes were detected (ng/L) in the collected wastewater samples during a 24-h period: NDB 150.1, LDB 200.6, and LR 89.0–244.0 in influents and NDB 22.8, LDB 78.6, and LR 74.0 in effluents.

Sign in / Sign up

Export Citation Format

Share Document