World's Best Scientists 2026 revealed!

D-Index & Metrics

Chemistry

D-Index
58
Citations
10264
World Ranking
10786
National Ranking
208

R.W. Frei publication distribution in Chemistry in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Chemistry in 2026. The highlighted bar marks where R.W. Frei sits on this spectrum.

61–80 publications: 66 scientists 81–100 publications: 302 scientists 101–120 publications: 623 scientists 121–140 publications: 918 scientists 141–160 publications: 1,218 scientists 161–180 publications: 1,350 scientists 181–200 publications: 1,344 scientists 201–220 publications: 1,281 scientists 221–240 publications: 1,216 scientists 241–260 publications: 1,100 scientists 261–280 publications: 979 scientists 281–300 publications: 939 scientists 301–320 publications: 764 scientists 321–340 publications: 643 scientists 341–360 publications: 628 scientists 361–380 publications: 522 scientists 381–400 publications: 459 scientists 401–420 publications: 397 scientists 421–440 publications: 327 scientists 441–460 publications: 270 scientists 461–480 publications: 265 scientists 481–500 publications: 252 scientists 501–520 publications: 201 scientists 521–540 publications: 185 scientists 541–560 publications: 148 scientists 561–580 publications: 148 scientists 581–600 publications: 132 scientists 601–620 publications: 114 scientists 621–640 publications: 104 scientists 641–660 publications: 91 scientists 661–680 publications: 92 scientists 681–700 publications: 73 scientists 701–720 publications: 57 scientists 721–740 publications: 54 scientists 741–760 publications: 67 scientists 761–780 publications: 45 scientists 781–800 publications: 46 scientists 801–820 publications: 39 scientists 821–840 publications: 32 scientists 841–860 publications: 36 scientists 861–880 publications: 29 scientists 881–900 publications: 26 scientists 901–920 publications: 24 scientists 921–940 publications: 14 scientists 941–960 publications: 23 scientists 961–980 publications: 28 scientists 981–1,000 publications: 15 scientists 1,001–1,020 publications: 29 scientists 1,021–1,040 publications: 12 scientists 1,041–1,060 publications: 19 scientists 1,061–1,080 publications: 12 scientists 1,081–1,100 publications: 6 scientists 1,101–1,120 publications: 8 scientists 1,121–1,140 publications: 12 scientists 1,141–1,160 publications: 5 scientists 1,161–1,180 publications: 6 scientists 1,181–1,200 publications: 14 scientists 1,201–1,220 publications: 7 scientists 1,221–1,240 publications: 2 scientists 1,241–1,260 publications: 6 scientists 1,261–1,280 publications: 4 scientists 1,281–1,294 publications: 6 scientists 1,295+ publications: 100 scientists
61 publications 1,295+

This scientist: 311 publications — 66th percentile

66% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 1,295 publications or more.

R.W. Frei D-index placement in Chemistry in 2026

The chart shows the D-index (discipline H-index) distribution of Chemistry scientists ranked by Research.com in 2026. The highlighted bar marks where R.W. Frei sits on this spectrum.

40–41 D-Index: 289 scientists 42–43 D-Index: 612 scientists 44–45 D-Index: 808 scientists 46–47 D-Index: 776 scientists 48–49 D-Index: 835 scientists 50–51 D-Index: 861 scientists 52–53 D-Index: 872 scientists 54–55 D-Index: 933 scientists 56–57 D-Index: 1,051 scientists 58–59 D-Index: 930 scientists 60–61 D-Index: 882 scientists 62–63 D-Index: 834 scientists 64–65 D-Index: 731 scientists 66–67 D-Index: 775 scientists 68–69 D-Index: 683 scientists 70–71 D-Index: 646 scientists 72–73 D-Index: 561 scientists 74–75 D-Index: 501 scientists 76–77 D-Index: 437 scientists 78–79 D-Index: 388 scientists 80–81 D-Index: 354 scientists 82–83 D-Index: 292 scientists 84–85 D-Index: 275 scientists 86–87 D-Index: 254 scientists 88–89 D-Index: 235 scientists 90–91 D-Index: 185 scientists 92–93 D-Index: 192 scientists 94–95 D-Index: 155 scientists 96–97 D-Index: 163 scientists 98–99 D-Index: 125 scientists 100–101 D-Index: 105 scientists 102–103 D-Index: 105 scientists 104–105 D-Index: 112 scientists 106–107 D-Index: 88 scientists 108–109 D-Index: 68 scientists 110–111 D-Index: 69 scientists 112–113 D-Index: 65 scientists 114–115 D-Index: 79 scientists 116–117 D-Index: 61 scientists 118–119 D-Index: 44 scientists 120–121 D-Index: 37 scientists 122–123 D-Index: 40 scientists 124–125 D-Index: 33 scientists 126–127 D-Index: 26 scientists 128–129 D-Index: 34 scientists 130–131 D-Index: 35 scientists 132–133 D-Index: 25 scientists 134–135 D-Index: 27 scientists 136–137 D-Index: 17 scientists 138–139 D-Index: 16 scientists 140–141 D-Index: 20 scientists 142–143 D-Index: 20 scientists 144–145 D-Index: 15 scientists 146–147 D-Index: 9 scientists 148–149 D-Index: 9 scientists 150–151 D-Index: 16 scientists 152–153 D-Index: 11 scientists 154–155 D-Index: 9 scientists 156–157 D-Index: 3 scientists 158 D-Index: 3 scientists 159+ D-Index: 98 scientists
40 D-Index 159+

This scientist: 58 D-Index — 42nd percentile

42% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 159 D-Index or more.

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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