scholarly journals Photocatalytic Degradation of Diclofenac by Hydroxyapatite–TiO2 Composite Material: Identification of Transformation Products and Assessment of Toxicity

Materials ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 1779 ◽  
Author(s):  
Sapia Murgolo ◽  
Irina Moreira ◽  
Clara Piccirillo ◽  
Paula Castro ◽  
Gianrocco Ventrella ◽  
...  
Keyword(s):  
Chemical Structure ◽  
Wastewater Treatment Plants ◽  
Transformation Products ◽  
Environmental Water ◽  
Transformation Product ◽  
Target Compound ◽  
Germination Inhibition ◽  
Potential Applicability ◽  
Environmental Water Matrices

Diclofenac (DCF) is one of the most detected pharmaceuticals in environmental water matrices and is known to be recalcitrant to conventional wastewater treatment plants. In this study, degradation of DCF was performed in water by photolysis and photocatalysis using a new synthetized photocatalyst based on hydroxyapatite and TiO2 (HApTi). A degradation of 95% of the target compound was achieved in 24 h by a photocatalytic treatment employing the HApTi catalyst in comparison to only 60% removal by the photolytic process. The investigation of photo-transformation products was performed by means of UPLC-QTOF/MS/MS, and for 14 detected compounds in samples collected during treatment with HApTi, the chemical structure was proposed. The determination of transformation product (TP) toxicity was performed by using different assays: Daphnia magna acute toxicity test, Toxi-ChromoTest, and Lactuca sativa and Solanum lycopersicum germination inhibition test. Overall, the toxicity of the samples obtained from the photocatalytic experiment with HApTi decreased at the end of the treatment, showing the potential applicability of the catalyst for the removal of diclofenac and the detoxification of water matrices.

scholarly journals Development and Optimisation of a Multiresidue Method for the Determination of 40 Anthelmintic Compounds in Environmental Water Samples by Solid Phase Extraction (SPE) with LC-MS/MS Detection

Molecules ◽  
2019 ◽  
Vol 24 (10) ◽  
pp. 1978 ◽  
Author(s):  
Damien Mooney ◽  
Catherine Coxon ◽  
Karl G Richards ◽  
Laurence Gill ◽  
Per-Erik Mellander ◽  
...  
Keyword(s):  
Solid Phase Extraction ◽  
Water Samples ◽  
Solid Phase ◽  
Transformation Products ◽  
Environmental Water ◽  
Phase Extraction ◽  
Multiresidue Method ◽  
Groundwater Samples ◽  
Surface And Groundwater

A comprehensive multiresidue method was developed and validated for the determination of 40 anthelmintic compounds, including 13 transformation products, in surface and groundwater samples at sub nanogram per litre (ng L−1) levels. Anthelmintic residues were extracted from unfiltered water samples using polymeric divinylbenzene solid phase extraction (SPE) cartridges, and eluted with methanol: acetone (50:50, v/v). Purified extracts were concentrated, filtered and injected for UHPLC-MS/MS determination. The method recovery (at a concentration representative of realistic expected environmental water levels based on literature review) ranged from 83–113%. The method was validated, at three concentration levels, in accordance to Commission Decision 2002/657/EC and SANTE/11813/2017 guidelines. Trueness and precision, under within-laboratory reproducibility conditions, ranged from 88–114% and 1.1–19.4%, respectively. The applicability of the method was assessed in a pilot study whereby 72 different surface and groundwater samples were collected and analysed for the determination of these 40 compounds for the first time in Ireland. This is the most comprehensive method available for the investigation of the occurrence of both anthelmintic parent compounds and their transformation products in raw, unfiltered environmental waters.

scholarly journals Controlling contamination for determination of ultra-trace levels of priority pollutants chlorophenols in environmental water matrices

2019 ◽  
Vol 12 (8) ◽  
pp. 2905-2913 ◽  
Author(s):  
Yassine Kadmi ◽  
Lidia Favier ◽  
Tania Yehya ◽  
Isabelle Soutrel ◽  
Andrei Ionuţ Simion ◽  
...  
Keyword(s):  
Environmental Water ◽  
Priority Pollutants ◽  
Environmental Water Matrices ◽  
Ultra Trace

Determination of non-ionic and anionic surfactants in environmental water matrices

Talanta ◽  
2011 ◽  
Vol 84 (3) ◽  
pp. 859-866 ◽  
Author(s):  
Veronica Gomez ◽  
Laura Ferreres ◽  
Eva Pocurull ◽  
Francesc Borrull
Keyword(s):  
Anionic Surfactants ◽  
Environmental Water ◽  
Environmental Water Matrices

scholarly journals A Simple and Quick Method for the Determination of Pesticides in Environmental Water by HF-LPME-GC/MS

2016 ◽  
Vol 2016 ◽  
pp. 1-11 ◽  
Author(s):  
Helvécio C. Menezes ◽  
Breno P. Paulo ◽  
Maria José N. Paiva ◽  
Zenilda L. Cardeal
Keyword(s):  
Liquid Phase ◽  
Hollow Fiber ◽  
Environmental Water ◽  
Quick Method ◽  
Liquid Phase Microextraction ◽  
Salt Addition ◽  
Ethyl Octanoate ◽  
Environmental Water Matrices ◽  
Acceptor Phase

This paper describes a simple and quick method for sampling and also for carrying out the preconcentration of pesticides in environmental water matrices using two-phased hollow fiber liquid phase microextraction (HF-LPME). Factors such as extraction mode, time, solvents, agitation, and salt addition were investigated in order to validate the LPME method. The following conditions were selected: 6 cm of polypropylene hollow fiber, ethyl octanoate as an acceptor phase, and extraction during 30 min under stirring at 200 rpm. The optimized method showed good linearity in the range of 0.14 to 200.00 μg L−1; the determination coefficient (R2) was in the range of 0.9807–0.9990. The LOD ranged from 0.04 μg L−1to 0.44 μg L−1, and LOQ ranged from 0.14 μg L−1to 1.69 μg L−1. The recovery ranged from 85.17% to 114.73%. The method was applied to the analyses of pesticides in three environmental water samples (a spring and few streams) collected in a rural area from the state of Minas Gerais, Brazil.

scholarly journals Spectral Data Analysis and Identification of Vancomycin Hydrochloride

2021 ◽  
Vol 9 ◽  
Author(s):  
Ye Tian ◽  
Xiaomeng Chong ◽  
Shangchen Yao ◽  
Mingzhe Xu
Keyword(s):  
Mass Spectrometry ◽  
Nuclear Magnetic Resonance ◽  
Chemical Structure ◽  
Resonance Spectroscopy ◽  
Target Compound ◽  
Vancomycin Hydrochloride ◽  
M 10 ◽  
Acid Hydrochloride ◽  
Spectral Data Analysis

Objective: To establish a method for the determination of the chemical structure of vancomycin hydrochloride.Methods: Nuclear magnetic resonance spectroscopy and mass spectrometry were conducted to analyze the chemical structure of vancomycin hydrochloride.Results: In this study, the target compound (1) was identified as (Sα)-(3S, 6R, 7R, 22R, 23S, 26S, 36R, 38αR)-44-[[2-O-(3-amino-2, 3, 6-trideoxy-3-C-methyl-α-L-lyso-hexopyranosyl)-β-D-glucopyranosyl] oxy]-3-(carbamoylmethyl)-10, 19-dichloro-7, 22, 28, 30, 32-pentahydroxy-6-[[(2R)-4-methyl-2-(methylamino) pentanoyl] amino]-2, 5, 24, 38, 39-pentaoxo-2, 3, 4, 5, 6, 7, 23, 24, 25, 26, 36, 37, 38, 38α-tetradecahydro-22H-8, 11: 18, 21-dietheno-23, 36-(iminomethano)-13, 16: 31, 35-dimetheno-1H, 13H-[1, 6, 9] oxadiazacyclohexadecino [4, 5-m] [10, 2, 16]-benzoxadiazacyclotetracosine-26-carboxylic acid hydrochloride.Conclusion: The method used in this study is accurate and can be used for the production and structural elucidation of vancomycin hydrochloride.

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