scholarly journals Analytical methods for the determination of Cr6+ from fixed source emissions

2020 ◽  
Vol 2 (2) ◽  
pp. 185-192
Author(s):  
Mihaela Petrescu ◽  
◽  
Elena Bucur ◽  
Valeriu Danciulescu ◽  
Andreea Cozea ◽  
...  
Keyword(s):  
Analytical Methods ◽  
Limit Of Detection ◽  
Graphite Furnace ◽  
Absorption Spectrometry ◽  
Operating Conditions ◽  
Molecular Absorption ◽  
Limit Of Quantification ◽  
Furnace Atomization ◽  
Heated Glass

This study aimed to develop two analytical methods for the determination of Cr6+ from fixed source emissions, such as the molecular absorption spectrophotometric method (UV-VIS) and the graphite furnace atomization absorption spectrometry method (GTAAS). The first stage in the development of analytical methods involves establishing the optimal operating conditions for, taking air samples, treating them for analysis, and the proceeding for analysis, followed by validating the method by determining performance parameters. For both methods is highly recommended, the use of isokinetic sampling with a sampling probe by the heated glass, quartz, or PTFE. The limit of detection and the limit of quantification were concluded to be 12.38µg/m3 and 40µg/m3, respectively for the UV-VIS method and the GTAAS method 0.12 µg/m3 and 0.54 µg/m3 respectively.

scholarly journals An Improved Methodology for Determination of Fluorine in Biological Samples Using High-Resolution Molecular Absorption Spectrometry via Gallium Fluorine Formation in a Graphite Furnace

2021 ◽  
Vol 11 (12) ◽  
pp. 5493
Author(s):  
Andrzej Gawor ◽  
Andrii Tupys ◽  
Anna Ruszczyńska ◽  
Ewa Bulska
Keyword(s):  
High Resolution ◽  
Limit Of Detection ◽  
Graphite Furnace ◽  
Absorption Spectrometry ◽  
Biological Tissues ◽  
Biologically Active ◽  
Molecular Absorption ◽  
Biological Origin ◽  
Molecular Absorption Spectrometry

Nowadays growing attention is paid to the control of fluorine content in samples of biological origin as it is present in the form of various biologically active organic compounds. Due to the chemically-rich matrix of biological tissues, the determination of fluorine becomes a very difficult task. Furthermore, a required complex sample preparation procedure makes the determination of the low contents of F by ion chromatography UV-Vis or ion-selective electrodes not possible. High-resolution continuum source graphite furnace molecular absorption spectrometry (HR-CS GF MAS) seems to be the best option for this purpose due to its high robustness to matrix interferences, especially in the presence of carefully selected modifiers. In this work the possibility of quantitative F determination in water and animal tissues was examined by measuring the molecular absorption of gallium monofluoride (GaF) at 211.248 nm with the use of a commercially available HR-CS GF MAS system. Experimental conditions for the sensitive and precise determination of fluorine were optimized, including the time/temperature program as well as addition of gallium and modifier mixture in combined mode. Under these conditions the fluoride present in the sample was stabilized up to 600 °C, and the optimum vaporization temperature for GaF was 1540 °C. Palladium and zirconium deposited onto the graphite surface served as solid modifiers; sodium acetate and ruthenium modifiers were added directly to the sample. The limit of detection and the characteristic mass of the method were 0.43 μg/L and 8.7 pg, respectively. The proposed procedure was validated by the use of certified reference materials (CRMs) of lake water and animal tissue; the acceptable recovery was obtained, proving that it can be applied for samples with a similar matrix.

Understanding polyatomic interference in the determination of phosphorus via PO molecules using high-resolution continuum source graphite furnace molecular absorption spectrometry with direct solid analysis

2020 ◽  
Vol 35 (10) ◽  
pp. 2305-2314 ◽  
Author(s):  
Luiza Carolina Pomarolli ◽  
Márcia Andréia Mesquita Silva da Veiga ◽  
Martín Resano ◽  
Flávio Venâncio Nakadi
Keyword(s):  
High Resolution ◽  
Graphite Furnace ◽  
Absorption Spectrometry ◽  
Molecular Absorption ◽  
Continuum Source ◽  
Molecular Absorption Spectrometry ◽  
Polyatomic Interference ◽  
Direct Solid Analysis ◽  
Direct Solid

Study of the occurrence of a molecular interference affecting the determination of phosphorus by the molecular absorption of PO at 213.647 nm using HR CS SS-GF MAS.

Formation of calcium monofluoride in graphite furnace molecular absorption spectrometry, part I: interference mechanisms of competitive metals Ga, Al, Ba, and Sr

2018 ◽  
Vol 33 (1) ◽  
pp. 111-117 ◽  
Author(s):  
Nil Ozbek ◽  
Suleyman Akman
Keyword(s):  
Graphite Furnace ◽  
Absorption Spectrometry ◽  
Formation Mechanisms ◽  
Molecular Absorption ◽  
Molecular Absorption Spectrometry ◽  
Calcium Monofluoride

In this study, the formation mechanisms of CaF and the interference mechanisms of Al, Ba, Ga and Sr on the determination of F via CaF were studied.

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