Trapping efficiency of aqueous micropollutants sampled and analysed using the same capillary column. Theoretical aspects and experimental results

Goretti, G.; Russo, Mario Vincenzo; Veschetti, Enrico

doi:10.1007/bf02267932

Cited by 10 publications

(9 citation statements)

References 26 publications

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“…(3) and (6) and using the four constants previously determined, it was possible to estimate td (T~) and t'~ (Tr) of each tested compound (Table IV). Their values were used to calculate the corresponding zone velocities (Table IV) as described in [24].…”

Section: Measure Of Zone Velocitiesmentioning

confidence: 99%

“…The direct use of chromatographic peak widths to evaluate trapping efficiency is not allowed when some experimental conditions are not maintained or the same gas chromatograph is not used. These difficulties were recently overcome [24] by introducing a new variable (CrTrap) correlated only with the frontal dispersion of the retained solute. Moreover, the following mathematical relationship was proposed to estimate its value and was experimentally validated: 2 …”

Section: Introductionmentioning

confidence: 99%

“…(2), the zone velocity v of the considered substance is proportional to the solute-retardation factor RU and to the average velocity of the carrier gas Ugas, both measured at the solute-elution temperature T~. If the chromatographic peak of the analyzed substance presents a Gaussian profile, not deformed by the action of unforeseen or disturbing factors, then it is possible to determine v from the peak width at half height [24].…”

mentioning

confidence: 99%

“…This parameter can be calculated using the dead time td and the relative retention time t'~ at the elution temperature. In the past [24], the determination of t'~ and td had been carried out by injecting the examined compound and an unretained substance onto the chromatographic column held at the retention temperature. Such procedure, which had been used for two reference solutes, could not be applied to the present research because of its laboriousness.…”

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confidence: 99%

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Short open tubular columns to trap organic micro-pollutants from aqueous samples

et al. 2001

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SummaryIn l",,vo previous articles some of the present authors had assessed and proposed the direct use of an analytical capillary column with a bonded phase for both trapping and later GC analyzing organic compounds. A few factors influencing band dispersion of the solute had been investigated and a mathematical relationship developed to calculate the degree of retainedsubstance dispersion starting from GC peakwidths.This paper presents the effects of other variables (such as stationary-phase polarib,, percentage of methanol added to samples, class of tested compounds, pH of some solutions and ionic strength of the aqueous mediu m) on the trapping efficiency. A new approach is also proposed for the determination of the constants necessary to use the above-mentioned relationship. The possibilil',/of applying this sampling technique to "real"-samples analysis was assessed after evaluating the effects of a washing treatment of the stationary phase on the retained solutes. The suggested technique allows direct preconcentration and GC determination of organic compounds that are not very soluble in water.

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Section: Measure Of Zone Velocitiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Short open tubular columns to trap organic micro-pollutants from aqueous samples

et al. 2001

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“…It is evident that for such experiments the column has to be removed from the GC or at least disconnected from the detector. After installation of the column, the trapped analytes were analyzed, either directly [116] or after refocusing at the column entrance [117]. The method was used to determine PAils in up to 5 ml water samples.…”

Section: Open-tubular Trapping-thermal Desorptionmentioning

confidence: 99%

Trace level analysis of micropollutants in aqueous samples using gas chromatography with on-line sample enrichment and large volume injection

Mol

Janssen

Cramers

et al. 1995

Journal of Chromatography A

106

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Trace Determination of Organic Compounds in Water by Direct Enrichment in Multichannel Thick Film Silicone Rubber Traps with Capillary Gas Chromatography

Ortner

Rohwer

1999

J. High Resol. Chromatogr.

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The application of Multichannel Silicone Rubber Traps for the direct analysis of organic compounds in water was studied. The optimum collection flow rate for a 10 mL sample was found to be ca. 150 μL·min–1. The effect of methanol on the retention power of the trap was evaluated. The addition of a methanol fraction of up to 40% to the water standards did not show any loss in collection efficiency. It was shown that the extraction of organic compounds from water with the multichannel trap is uncomplicated, i. e. methanol is not required to achieve accurate analyses, concentration of the sample onto the trap is by gravity flow, and excess water remaining in the multichannel trap after water extraction is removed by centrifugation. With the use of the multichannel silicone rubber trap a wide boiling point range of compounds were analyzed from aqueous samples at levels of 1–4 μg·L–1.

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Trapping efficiency of aqueous micropollutants sampled and analysed using the same capillary column. Theoretical aspects and experimental results

Cited by 10 publications

References 26 publications

Short open tubular columns to trap organic micro-pollutants from aqueous samples

Short open tubular columns to trap organic micro-pollutants from aqueous samples

Trace level analysis of micropollutants in aqueous samples using gas chromatography with on-line sample enrichment and large volume injection

Trace Determination of Organic Compounds in Water by Direct Enrichment in Multichannel Thick Film Silicone Rubber Traps with Capillary Gas Chromatography

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