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Chemistry

D-Index
58
Citations
10264
World Ranking
10788
National Ranking
208

Overview

R.W. Frei was affiliated with the Vrije Universiteit Amsterdam in the Netherlands during their academic career.

Their recent publication record includes a paper titled Issue Information, published in 2023 in the journal Allergy. This paper involved collaborative work with several coauthors.

  • Carina Venter
  • Giulia Carla Immacolata Spolidoro
  • Yohannes Tesfaye Amera
  • Mohd Shaiful Aziz Rashid Ali
  • Sungkutu Nyassi

Their work was primarily published in the journal Allergy.

  • Allergy

Best Publications

  • Trace enrichment of polar compounds on chemically bonded and carbonaceous sorbents and application to chlorophenol

    C. E. Werkhoven-Goewie;U. A. T. Brinkman;R. W. Frei

  • Two-dimensional column liquid chromatographic technique for resolution of complex mixtures

    Unknown

  • Influence of organic bases on the stability and separation properties of reversed-phase chemically bonded silica gels

    A. Wehrli;J.C. Hildenbrand;H.P. Keller;R. Stampfli

  • On-line trace enrichment in high-performance liquid chromatography using a pre-column

    H.P.M. Van Vliet;Th.C. Bootsmann;R.W. Frei;U.A.Th. Brinkman

  • Recovery of organic compounds from large-volume aqueous samples using on-line liquid chromatographic preconcentration techniques

    P. Subra;M.-C. Hennion;R. Rosset;R.W. Frei

  • The separation of nonapeptides by reversed-phase high-performance liquid chromatography

    Unknown

  • Immunoaffinity pre-column for selective on-line sample pre-treatment in high-performance liquid chromatography determination of 19-nortestosterone

    A. Farjam;G.J. De Jong;R.W. Frei;U.A. Th. Brinkman

  • Use of PTFE coils in post-column photochemical reactors for liquid chromatograph — application to pharmaceuticals

    A.H.M.T. Scholten;P.L.M. Welling;U.A.Th. Brinkman;R.W. Frei

  • Industrial wastewater analysis by liquid chromatography with precolumn technology and diode-array detection

    M. W. F. Nielen;U. A. T. Brinkman;R. W. Frei

  • Liquid chromatographic trace enrichment with on‐line capillary gas chromatography for the determination of organic pollutants in aqueous samples

    E. Noroozian;F. A. Maris;M. W. F. Nielen;R. W. Frei

  • Amperometric detection of amino acids in high-performance liquid chromatography with a copper electrode

    W. T. Kok;U. A. T. Brinkman;R. W. Frei

  • Amperometric detection of amino acids with a passivated copper electrode

    W.Th. Kok;H.B. Hanekamp;P. Bos;R.W. Frei

  • Use of conventinal instrumentation with microbore column in high-performance liquid chromatography

    W.Th. Kok;U.A.Th. Brinkman;R.W. Frei;H.B. Hanekamp

  • Use of Pyrocarbon Sorbents for Trace Enrichment of Polar Compounds from Aqueous Samples with On-line HPLC Analysis

    W. Golkiewicz;C.E. Werkhoven-Goewie;U.A.Th. Brinkman;R.W. Frei

  • Sensitized room temperature phosphorescence in liquid solutions with 1,4-dibromonaphthalene and biacetyl as acceptors

    J. J. Donkerbroek;C. Gooijer;N. H. Velthorst;R. W. Frei

  • Fully automated sample handling system for liquid chromatography based on pre-column technology and automated cartridge exchange.

    M.W.F. Nielen;A.J. Valk;R.W. Frei;U.A.Th. Brinkman

  • Packing techniques for small-particle silica gels in high-speed liquid chromatography

    Unknown

  • Supercritical-fluid extraction of aqueous samples and on-line coupling to supercritical-fluid chromatography

    D. Thiebaut;J.-P. Chervet;R.W. Vannoort;G.J. De Jong

  • Pre-column technology in high-performance liquid chromatography for the determination of phenylurea herbicides in water in the presence of their anilines☆

    C.E. Goewie;P. Kwakman;R.W. Frei;U.A.Th. Brinkman

  • Flow injection determination of hydrogen peroxide by means of a solid-state-peroxyoxalate chemiluminescence reactor

    Unknown

  • Design and evaluation of a sandwich phase separator for on-line liquid/liquid extraction

    C. De Ruiter;J.H. Wolf;U.A. Th. Brinkman;R.W. Frei

  • Comparison between positive, negative and chloride-enhanced negative chemical ionization of organophosphorus pesticides in on-line liquid chromatography-mass spectrometry.

    D. Barceló;F.A. Maris;R.B. Geerdink;R.W. Frei

  • Optimization of precolumn design in liquid chromatography

    C.E. Goewie;M.W.F. Nielen;R.W. Frei;U.A.Th. Brinkman

  • A solid-state chemiluminescence detector for hydrogen peroxide based on an immobilized luminophore

    P. van Zoonen;D.A. Kamminga;C. Gooijer;N.H. Velthorst

Frequent Co-Authors

Udo A. Th. Brinkman
Udo A. Th. Brinkman Vrije Universiteit Amsterdam
Damià Barceló
Damià Barceló University of Almería
Johan C. Kraak
Johan C. Kraak University of Amsterdam
Wilfried M. A. Niessen
Wilfried M. A. Niessen Vrije Universiteit Amsterdam
Marie-Claire Hennion
Marie-Claire Hennion Centre national de la recherche scientifique, CNRS
Gerald Gübitz
Gerald Gübitz University of Graz
Bärbel Hahn-Hägerdal
Bärbel Hahn-Hägerdal Lund University
György Marko-Varga
György Marko-Varga Lund University
Georges Guiochon
Georges Guiochon University of Tennessee at Knoxville
Nico P. E. Vermeulen
Nico P. E. Vermeulen Vrije Universiteit Amsterdam

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