Author
G. René van der Hoff
Bio: G. René van der Hoff is an academic researcher. The author has contributed to research in topics: Gas chromatography & Chromatography detector. The author has an hindex of 5, co-authored 6 publications receiving 368 citations.
Papers
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TL;DR: The role of gas chromatography as an analytical tool in combination with currently used or recently developed sample preparation techniques is described.
228 citations
TL;DR: In this article, the ASPEC system was coupled with capillary GC-ECD by means of a loop-type interface equipped with a solvent vapour exit, leading to an effective clean-up of the extracts analyzed.
Abstract: The ASPEC (Automatic Sample Preparation with Extraction Columns) system has been coupled on-line to capillary GC-ECD by means of a loop-type interface equipped with a solvent vapour exit. Both ASPEC and GC conditions have been optimized leading to an effective clean-up of the extracts analyzed.
By means of solid-phase extraction cartridges filled with silica, it has been possible to analyze concentrated surface water extracts for a group of 18 electron-capturing compounds present in the water at ppt levels. ASPEC-GC has also been applied to the determination of synthetic pyrethroids at ppt levels in surface water.
The complete analytical procedure is greatly facilitated by automation and miniaturization. Miniaturization results in a considerable decrease in the sample volume required. The potential of the method for the analysis of other pesticides is estimated.
49 citations
TL;DR: In this article, micro liquid-liquid extraction with methyl tert-butyl ether was combined with GC-FPD in a fully automated set-up, using GC sample introduction volumes of 500 μl, which were transferred via an oncolumn interface equipped with an early vapour exit.
40 citations
TL;DR: In this article, a phase switch from an aqueous reversed phase (RP) solvent to an organic solvent facilitates the introduction of the analyte in the GC system, since organic solvents such as hexane, pentane, and dichloromethane are more appropriate for the GC-injection technique used in this study.
Abstract: Reversed phase LC is coupled to capillary GC by means of an on-line extraction of the LC eluent. The extract is transferred to a loop-type LC-GC interface equipped with an early vapor exit. Using a phase switch from an aqueous reversed-phase (RP)LC solvent to an organic solvent facilitates the introduction of the analyte in the GC system, since organic solvents such as hexane, pentane, and dichloromethane are more appropriate for the GC-injection technique used in this study. As the partition coefficient of an organic solvent/aqueous system is correlated to the retention mechanism of reversed phase LC, the method has a general potential in LC/GC interfacing, viz. the extractability a component from the LC mobile phase eluting above a certain capacity factor from a RPLC column can be expected to be efficient. The method is applied to the determination of residues of the fungicide fenpropimorph in barley, oats, rye, and wheat. Another application of the interface which is feasible is the on-line extraction of aqueous samples prior to large volume injection on GC-NPD. The potential of the interface for the determination of residues nitrogen containing herbicides is estimated.
33 citations
TL;DR: Deactivation of precolumns with an ultra thin film of OV-1701 provided inertness at least equal to silylation, but better resistance to water.
Abstract: Deactivation of precolumns with an ultra thin film of OV-1701 provided inertness at least equal to silylation, but better resistance to water Dynamic coating of the raw fused silica capillary is, furthermore, much faster than the hydrothermal treatment/silylation procedure
23 citations
Cited by
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TL;DR: The objective of this review is to provide updated information about the most important features of the new solid-phase extraction (SPE) materials, their interaction mode and their potential for modern SPE.
975 citations
TL;DR: The principles of stir bar sorptive extraction are described and an overview of SBSE applications is given, as illustrated by several successful applications in trace analysis in environmental, food and biomedical fields.
451 citations
TL;DR: The method was used to study the occurrence of the selected pollutants in surface and groundwater used for abstraction of drinking water in a waterworks and to evaluate the removal efficiency of the different water treatments applied.
394 citations
TL;DR: This review discussed classification, mechanisms, benefits and adverse effects of the pesticides on both human beings and the environment, and some remedial measures to mitigate their toxicity.
373 citations
TL;DR: The developed analytical method proved to be very durable during a 3-month field study and the target analytes were detected in concentrations of 5-3,500 ng/l in waste water treatment plant effluents, river water and lake water.
357 citations