AN OVERVIEW ON BASIC AND ADVANCED CHROMATOGRAPHIC TECHNIQUES

Chromatography is a technique for separating various inorganic and organic compounds. It is one of the separation techniques used as differential migration. It is more advantageous over conventional separating methods such as crystallization, solvent extraction and distillation. The purpose of review is to present various chromatographic techniques included a few advanced forms such as FC, HPLC,UPLC and UPCC (Super Critical chromatography).These are rapid forms of chromatographic techniques based on air pressure driven, optimized for rapid and precise separation of an organic compound. Keywords: Chromatographic techniques, Column chromatography, HPLC, UPLC, FC, UPC

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The development of pulsed waveforms for the electrochemical detection of inorganic and organic compounds in flow-injection analysis and liquid chromatography

10.31274/rtd-180813-8633 ◽

1987 ◽

Author(s):

Glen Gary Neuburger

Keyword(s):

Liquid Chromatography ◽

Organic Compounds ◽

Electrochemical Detection ◽

Flow Injection ◽

Flow Injection Analysis ◽

Inorganic And Organic

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Stationary source emissions. Determination of the mass concentration of individual gaseous organic compounds. Sorptive sampling method followed by solvent extraction or thermal desorption

10.3403/30243101u ◽

2015 ◽

Keyword(s):

Solvent Extraction ◽

Organic Compounds ◽

Thermal Desorption ◽

Mass Concentration ◽

Sampling Method ◽

Stationary Source

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A MEMS µ-Preconcentrator Employing a Carbon Molecular Sieve Membrane for Highly Volatile Organic Compound Sampling

Chemosensors ◽

10.3390/chemosensors9050104 ◽

2021 ◽

Vol 9 (5) ◽

pp. 104

Author(s):

Hung-Yang Kuo ◽

Wei-Riu Cheng ◽

Tzu-Heng Wu ◽

Horn-Jiunn Sheen ◽

Chih-Chia Wang ◽

...

Keyword(s):

Organic Compound ◽

Organic Compounds ◽

Volatile Organic Compound ◽

Molecular Sieve ◽

Amplification Factor ◽

Microfluidic Channel ◽

Carbon Molecular Sieve ◽

Volatile Organic ◽

Chromatographic Peaks ◽

Gaseous Toluene

This paper presents the synthesis and evaluation of a carbon molecular sieve membrane (CMSM) grown inside a MEMS-fabricated μ-preconcentrator for sampling highly volatile organic compounds. An array of µ-pillars measuring 100 µm in diameter and 250 µm in height were fabricated inside a microfluidic channel to increase the attaching surface for the CMSM. The surface area of the CMSM was measured as high as 899 m2/g. A GC peak amplification factor >2 × 104 was demonstrated with gaseous ethyl acetate. Up to 1.4 L of gaseous ethanol at the 100 ppb level could be concentrated without exceeding the capacity of this microchip device. Sharp desorption chromatographic peaks (<3.5 s) were obtained while using this device directly as a GC injector. Less volatile compounds such as gaseous toluene, m-xylene, and mesitylene appeared to be adsorbed strongly on CMSM, showing a memory effect. Sampling parameters such as sample volatilities, sampling capacities, and compound residual issues were empirically determined and discussed.

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