Author
K. Marsden
Bio: K. Marsden is an academic researcher. The author has contributed to research in topics: Column chromatography & Elution. The author has an hindex of 1, co-authored 1 publications receiving 225 citations.
Topics: Column chromatography, Elution
Papers
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TL;DR: Alumina, activated at 800° and partially deactivated with 5% by weight of water, was found to be the most efficient and silica columns were more effective in the separation of pesticides by differential elution.
226 citations
Cited by
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TL;DR: The conclusion is drawn that the observed decrease in the reproductive success of the Dutch seal population correlates strongly with the high concentrations of PCB's in the tissues.
244 citations
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 paper, the kinetics of six chlorobenzenes in guppies were studied in an accumulation and elimination experiment, and a parabolic curve, with an optimum at log Poct ≈ 5.4, appeared to be a better description of the relation of the uptake rate constant with log poct, than a straight line.
198 citations
TL;DR: In this paper, three institutes worked together on the development and improvement of methods for the analysis of polybrominated diphenylethers (PBDEs) in sediments and biota.
Abstract: Three institutes worked together on the development and improvement of methods for the analysis of polybrominated diphenylethers (PBDEs) in sediments and biota. The methods developed consist of a Soxhlet, Ultra Turrax* (biota) or shake-flask extraction (sediment) using hexane (or pentane)/acetone solvent mixtures, clean-up by alumina column chromatography or by gel permeation chromatography, further clean-up by silica gel column chromatography and treatment with sulphuric acid. Several alternatives for extraction and clean-up yielded similar results. The final determination is performed by GC/NCI-MS in the selected ion mode with m/z values of both Br isotopes (79 and 81 occurring in a 1:1 ratio). For decaBDE the fragments m/z 486.7 and 488.7 were also scanned. The coefficients of variation obtained with this method are between 10 and 35% for individual congeners, and comply at least with the international state-of-the-art for this type of analysis.
161 citations
TL;DR: Blood samples can be a useful tool in monitoring programmes of chlorobiphenyl concentrations because the ratios between persistent and metabolizable congeners differed between specimens, and it was not possible to derive 'dioxin type' toxic equivalents from concentrations of congeners occurring at much higher concentrations by calculation of their ratios.
161 citations