Graphitized capillary columns for the determination of chlorinated compounds

Bacaloni, Alessandro; Goretti, G.; Laganà, Anna; Petronio, B.M.

doi:10.1016/s0021-9673(00)86412-2

Cited by 8 publications

(2 citation statements)

References 5 publications

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“…The influence of the degree of graphitization on the adsorption process has been investigated [6,7] and the role of the polarity of the liquid phase, the thickness and uniformity of the coating, and the choice of carbon blacks of different origin have been tested [8][9][10][11]. Owing to the advantage in resolution and analysis speed offered by capillary columns, glass capillary columns coated with graphite or carbon black have been prepared by various techniques and their performances evaluated [12][13][14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

The selectivity and polarity of carbon layer open tubular capillary columns modified with a polar liquid phase

Castello

Vezzani

Moretti

1994

J. High Resol. Chromatogr.

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column was found to depend on temperature, and changing the analytical conditions therefore enabled the separation of compounds of different polarity whose reciprocal position and resolution were affected by temperature. The application of calculation methods which enable programmed temperature retention times to be predicted from isothermal data was also found to be possible when the polarity of the CLOT column changes with temperature.

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Section: Introductionmentioning

confidence: 99%

The selectivity and polarity of carbon layer open tubular capillary columns modified with a polar liquid phase

Castello

Vezzani

Moretti

1994

J. High Resol. Chromatogr.

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“…In the last decade, as an alternative to liquid partitioning, the method of combined extraction and preconcentration of organic compounds in water by adsorption on proper solid materials followed by desorption with a small quantity of an organic solvent has been employed extensively for trace determination of contaminants in environmental waters (1)(2)(3)(4)(5)(6)(7)(8). The recent availability of sorbents in small, inexpensive cartridges has contributed t o the dramatic expansion of the use of solid-phase extraction (SPE), as evidenced by some selected publications (9)(10)(11)(12)(13).…”

mentioning

confidence: 99%

Extraction and isolation of phenoxy acid herbicides in environmental waters using two adsorbents in one minicartridge

Corcia¹,

Marchetti²,

Samperi³

1989

Anal. Chem.

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Selectlve solid-phase extraction from environmental waters of nlne popular acldlc herblcldes was accompllshed by using one mlniaturlzed cartridge contalning in the top slde 50 mg of a nonspecific adsorbent, that Is graphitized carbon black (Carbopack B), and In the lower side 70 mg of a slllca-based strong anlon exchanger (SAX). After sample percolation, the SAX materlai was actlvated by passlng through the trap sodlum acetate, l moi/L. A 3-mL solvent mlxture of CH, Ci , / CH, OH (80:20, by volume) badfled with 1 mmol/L NaOH was then allowed to flow through the cartridge, and phenoxy acids were removed from the Carbopack surface and selectively readsorbed on the exchanger surface. After washing, the nlne herblcides were desorbed from the SAX surface wkh 0.0 mL of water/methanol (50:50, by volume) contalning trlfluoroacetlc acid and potasslum chloride. A 100-pL portion of thls solution was directly injected into the HPLC column, operatlng in the Ion suppression-reversed-phase mode. As ion suppressor, the substitutlon of the commonly used acetlc acld with trlfluoroacetlc acid allowed sensitive detectlon at 230 nm. Recovery of the nlne acidic herblcides ranged between 94% and loo%, lrrespectlve of the sample type considered. By thls extractlon method, bask, neutral, and weakly acldic compounds do not interfere with the analysis. Interestlngly, thls cartridge Is suitable for fleld sampllng, as Carbopack is able to adsorb phenoxy aclds from water at whatever pH value. The llmlts of detectlon of the nlne herbicides were well below 0.1 pg/L. The effectiveness In terms of recovery and selectivity of the two-adsorbent tandem system was compared with that of a C-18 disposable cartrldge.In the last decade, as an alternative to liquid partitioning, the method of combined extraction and preconcentration of organic compounds in water by adsorption on proper solid materials followed by desorption with a small quantity of an organic solvent has been employed extensively for trace determination of contaminants in environmental waters (1-8). The recent availability of sorbents in small, inexpensive cartridges has contributed t o the dramatic expansion of the use of solid-phase extraction (SPE), as evidenced by some selected publications (9-13). Besides solving well-known problems associated with the classical solvent extractionsolvent removal method, the S P E technique is particularly attractive as it lends itself to coupling with chromatographic systems for on-line applications (14). Another impressive feature of the SPE technique is that small sorbent traps can be deployed in the field by using newly available submersible instrumentation (15,16). In this way, combined sampling, extraction, and preconcentration are done at the sampling site, thus eliminating most contamination and handling problems connected to the sample collection. In addition, immediate isolation of organics from the aqueous matrix by an adsorbing material can preserve analytes from bacterial attack occurring between the time of sample collection and analysis...

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Preparation of Adsorbent Layer Open Tubular Columns

Berezkin¹,

Zeeuw²

1996

Capillary Gas Adsorption Chromatography

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Graphitized capillary columns for the determination of chlorinated compounds

Cited by 8 publications

References 5 publications

The selectivity and polarity of carbon layer open tubular capillary columns modified with a polar liquid phase

The selectivity and polarity of carbon layer open tubular capillary columns modified with a polar liquid phase

Extraction and isolation of phenoxy acid herbicides in environmental waters using two adsorbents in one minicartridge

Preparation of Adsorbent Layer Open Tubular Columns

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