Solid phase microextraction gas chromatography-glow discharge-optical emission detection for tin and lead speciation

Orellana-Velado, Néstor Guillermo; Pereiro, Rosario; Sanz‐Medel, Alfredo

doi:10.1039/b009935j

Cited by 22 publications

(21 citation statements)

References 27 publications

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“…Also hollow cathodes are often used in order to improve detection limits and efficiency. Thus Cl and Br, 32 hydrocarbons, 33 Hg, 3 Sn and Pb 34 and As and Sb 35 were successfully determined. In ref.…”

Section: Introduction 1survey Of Existing Methods For the Analysis Of...mentioning

confidence: 94%

Analysis of gaseous reaction products of wet chemical silicon etching by conventional direct current glow discharge optical emission spectrometry (DC-GD-OES)

Hoffmann

Steinert

Acker

2011

J. Anal. At. Spectrom.

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Major parts of the mechanism of the wet chemical etching of Si using mixtures of nitric and hydrofluoric acid are still in question. One of them is the issue about the formation of H and its relevance in the oxidation of Si. In the present work H evolution during acid etching of Si was estimated as a function of the HF/HNO 3 mixing ratio and the temperature. A commercial GD-OES instrument with an unchanged Grimm type glow discharge chamber was used to determine the amount of formed H. A small fraction of the reaction gases, originated by etching of Si in a PTFE apparatus under Ar atmosphere, was fed by a constant Ar flow via a drying column into the discharge chamber. The gases were excited by the plasma of a continuously DC sputtered Fe sample. Numerous elements like Si, N, O, H, and even B from the B-doped Si were detected. However, only the H emissions at 121.5 nm and 656.3 nm were used for the estimation of the released H. The obtained results show that H is preferentially generated in HNO 3 -poor etch solutions (HNO 3 < 40% (v/v)). In the range from À10 to 35 C the temperature of the etch solution shows a negligible influence on the H generation, but affects the amount of nitrous gases. This indicates that particularly in HNO 3 -poor etch solutions the oxidation of Si proceeds to a considerable extent via the formation of H parallel to the already known pathway via the reduction of HNO 3 .

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Section: Introduction 1survey Of Existing Methods For the Analysis Of...mentioning

confidence: 94%

Analysis of gaseous reaction products of wet chemical silicon etching by conventional direct current glow discharge optical emission spectrometry (DC-GD-OES)

Hoffmann

Steinert

Acker

2011

J. Anal. At. Spectrom.

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“…In the two past decades, SPME as a sample preparation method for drug analysis has been used with various analysis methods. SPME was used with different separation techniques such as capillary gas chromatography (CGC) [ 23 – 30 ], GC/GC-MS [ 31 – 37 ], LC/LC-MS [ 38 – 50 ], GC-ICP-MS [ 51 – 57 ], and HPLC-UV/HPLC-MS [ 58 – 68 ].…”

Section: Solid Phase Microextraction (Spme) For Drug Analysismentioning

confidence: 99%

Solid Phase Microextraction and Related Techniques for Drugs in Biological Samples

Moein

Said

Bassyouni

et al. 2014

Journal of Analytical Methods in Chemistry

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In drug discovery and development, the quantification of drugs in biological samples is an important task for the determination of the physiological performance of the investigated drugs. After sampling, the next step in the analytical process is sample preparation. Because of the low concentration levels of drug in plasma and the variety of the metabolites, the selected extraction technique should be virtually exhaustive. Recent developments of sample handling techniques are directed, from one side, toward automatization and online coupling of sample preparation units. The primary objective of this review is to present the recent developments in microextraction sample preparation methods for analysis of drugs in biological fluids. Microextraction techniques allow for less consumption of solvent, reagents, and packing materials, and small sample volumes can be used. In this review the use of solid phase microextraction (SPME), microextraction in packed sorbent (MEPS), and stir-bar sorbtive extraction (SBSE) in drug analysis will be discussed. In addition, the use of new sorbents such as monoliths and molecularly imprinted polymers will be presented.

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“…Another problem arises when coupling GC to element-selective detectors, such as ICP-atomic emission spectrometry (ICP-AES) or ICP-MS. The transfer line must also be heated up to the plasma, either by a pre-heated sheath gas (Orellana-Velado et al 2001) or by heating-wires. Proximity of the metal compounds (heating wire) to the generator spool is problematic.…”

Section: Problems and Limitationsmentioning

confidence: 99%

Element Speciation Analysis

Michalke¹

2004

Elements and Their Compounds in the Environment

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Solid phase microextraction gas chromatography-glow discharge-optical emission detection for tin and lead speciation

Cited by 22 publications

References 27 publications

Analysis of gaseous reaction products of wet chemical silicon etching by conventional direct current glow discharge optical emission spectrometry (DC-GD-OES)

Analysis of gaseous reaction products of wet chemical silicon etching by conventional direct current glow discharge optical emission spectrometry (DC-GD-OES)

Solid Phase Microextraction and Related Techniques for Drugs in Biological Samples

Element Speciation Analysis

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