scholarly journals Analytical Methodology for the Determination of Trace Metals in Biodiesel

10.5772/25777 ◽  
2011 ◽  
Author(s):  
Fabiana A. ◽  
Danielle Goveia ◽  
Leonardo F. ◽  
Andre H.
Keyword(s):  
Trace Metals ◽  
Analytical Methodology

scholarly journals Application of Bar Adsorptive Microextraction for the Determination of Levels of Tricyclic Antidepressants in Urine Samples

Molecules ◽  
2021 ◽  
Vol 26 (11) ◽  
pp. 3101
Author(s):  
Mariana N. Oliveira ◽  
Oriana C. Gonçalves ◽  
Samir M. Ahmad ◽  
Jaderson K. Schneider ◽  
Laiza C. Krause ◽  
...  
Keyword(s):  
Tricyclic Antidepressants ◽  
Matrix Effects ◽  
Activated Carbons ◽  
Process Efficiency ◽  
Gas Chromatography Mass Spectrometry ◽  
Selected Ion Monitoring ◽  
Experimental Conditions ◽  
Analytical Methodology ◽  
Low Efficiency

This work entailed the development, optimization, validation, and application of a novel analytical approach, using the bar adsorptive microextraction technique (BAμE), for the determination of the six most common tricyclic antidepressants (TCAs; amitriptyline, mianserin, trimipramine, imipramine, mirtazapine and dosulepin) in urine matrices. To achieve this goal, we employed, for the first time, new generation microextraction devices coated with convenient sorbent phases, polymers and novel activated carbons prepared from biomaterial waste, in combination with large-volume-injection gas chromatography-mass spectrometry operating in selected-ion monitoring mode (LVI-GC-MS(SIM)). Preliminary assays on sorbent coatings, showed that the polymeric phases present a much more effective performance, as the tested biosorbents exhibited low efficiency for application in microextraction techniques. By using BAμE coated with C18 polymer, under optimized experimental conditions, the detection limits achieved for the six TCAs ranged from 0.2 to 1.6 μg L−1 and, weighted linear regressions resulted in remarkable linearity (r2 > 0.9960) between 10.0 and 1000.0 μg L−1. The developed analytical methodology (BAμE(C18)/LVI-GC-MS(SIM)) provided suitable matrix effects (90.2–112.9%, RSD ≤ 13.9%), high recovery yields (92.3–111.5%, RSD ≤ 12.3%) and a remarkable overall process efficiency (ranging from 84.9% to 124.3%, RSD ≤ 13.9%). The developed and validated methodology was successfully applied for screening the six TCAs in real urine matrices. The proposed analytical methodology proved to be an eco-user-friendly approach to monitor trace levels of TCAs in complex urine matrices and an outstanding analytical alternative in comparison with other microextraction-based techniques.

Development and validation of an analytical methodology for the determination of p,p′-DDT, p,p′-DDE and p,p′-DDD in fish oil pills

2007 ◽  
Vol 86 (2) ◽  
pp. 183-188 ◽  
Author(s):  
Juan José Berzas Nevado ◽  
Rosa Carmen Rodríguez Martín-Doimeadiós ◽  
Francisco Javier Guzmán Bernardo ◽  
Nuria Rodríguez Fariñas
Keyword(s):  
Fish Oil ◽  
Analytical Methodology ◽  
Development And Validation

Automated digestion and extraction apparatus for use in the determination of trace metals in foodstuffs

The Analyst ◽  
1978 ◽  
Vol 103 (1225) ◽  
pp. 317 ◽  
Author(s):  
C. J. Jackson ◽  
D. G. Porter ◽  
A. L. Dennis ◽  
P. B. Stockwell
Keyword(s):  
Trace Metals ◽  
Extraction Apparatus

Intercomparison of different methods for the determination of trace metals in seawater

1983 ◽  
Vol 13 (4) ◽  
pp. 327-339 ◽  
Author(s):  
Lutz Brügmann ◽  
Lars-Göran Danielsson ◽  
Bertil Magnusson ◽  
Stig Westerlund
Keyword(s):  
Trace Metals

UV-Vis Spectrophotometrical and Analytical Methodology for the Determination of Singlet Oxygen in New Antibacterials Drugs

2007 ◽  
Vol 2 ◽  
pp. 117739010700200 ◽  
Author(s):  
Tamara Zoltan ◽  
Franklin Vargas ◽  
Carla Izzo
Keyword(s):  
Reactive Oxygen Species ◽  
Singlet Oxygen ◽  
Nalidixic Acid ◽  
Reactive Oxygen ◽  
Oxygen Species ◽  
Inexpensive Method ◽  
Analytical Methodology ◽  
First Time

We have determined and quantified spectrophotometrically the capacity of producing reactive oxygen species (ROS) as 1O2 during the photolysis with UV-A light of 5 new synthesized naphthyl ester derivates of well-known quinolone antibacterials (nalidixic acid (1), cinoxacin (2), norfloxacin (3), ciprofloxacin (4) and enoxacin (5)). The ability of the naphthyl ester derivatives (6-10) to generate singlet oxygen were detecting and for the first time quantified by the histidine assay, a sensitive, fast and inexpensive method. The following tendency of generation of singlet oxygen was observed: compounds 7 >10 > 6 > 8 > 9 >> parent drugs 1-5.

scholarly journals Determination of trace metals in water from Mangueira Lagoon – RS, Brazil

2018 ◽  
Vol 13 (3) ◽  
pp. 612-620
Author(s):  
Filipe Sousa dos Santos ◽  
Eduarda Medran Rangel ◽  
Pedro José Sanches Filho
Keyword(s):  
Trace Metals ◽  
Atomic Emission ◽  
Atomic Absorption Spectrophotometry ◽  
Emission Spectrometry ◽  
Chemical Parameters ◽  
Chelex 100 ◽  
Physical Chemical ◽  
Low Degree ◽  
Copper Zinc

Abstract Determination of trace metals was carried out in Mangueira Lagoon, in the southern zone of Rio Grande do Sul. Samples were collected at five points to evaluate the concentrations of the following trace metals: copper, zinc, lead, chromium, nickel and iron. Metals were determined by digestion with concentrated nitric acid and pre-concentrated in Chelex 100 resin analyzed by atomic absorption spectrophotometry. In parallel, the physical-chemical parameters pH, chlorides, alkalinity, hardness and organic matter in the water were determined. Potassium and sodium metals were analyzed by atomic emission spectrometry. The analyzes of pH and conductance were analyzed in the field while the others were done in the laboratory of the research group of environmental contaminants (GPCA). Through the results of physical-chemical parameters of the water, the Mangueira Lagoon exhibits a low degree of contamination, but in the future may compromise the biota of the lagoon. Regarding the focus of this work, of Cu, Cr, Fe, Ni, Pb, and Zn (heavy metals), only lead and iron obtained the values above that are established in CONAMA 357/2005.

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