World's Best Scientists 2026 revealed!

D-Index & Metrics

Environmental Sciences

D-Index
49
Citations
10229
World Ranking
5189
National Ranking
1908

Chemistry

D-Index
50
Citations
10183
World Ranking
14288
National Ranking
3687

George R. Helz publication distribution in Environmental Sciences in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Environmental Sciences in 2026. The highlighted bar marks where George R. Helz sits on this spectrum.

41–50 publications: 21 scientists 51–60 publications: 62 scientists 61–70 publications: 133 scientists 71–80 publications: 257 scientists 81–90 publications: 361 scientists 91–100 publications: 440 scientists 101–110 publications: 492 scientists 111–120 publications: 541 scientists 121–130 publications: 617 scientists 131–140 publications: 544 scientists 141–150 publications: 541 scientists 151–160 publications: 539 scientists 161–170 publications: 444 scientists 171–180 publications: 444 scientists 181–190 publications: 400 scientists 191–200 publications: 377 scientists 201–210 publications: 318 scientists 211–220 publications: 283 scientists 221–230 publications: 263 scientists 231–240 publications: 220 scientists 241–250 publications: 217 scientists 251–260 publications: 180 scientists 261–270 publications: 181 scientists 271–280 publications: 155 scientists 281–290 publications: 130 scientists 291–300 publications: 127 scientists 301–310 publications: 130 scientists 311–320 publications: 85 scientists 321–330 publications: 106 scientists 331–340 publications: 80 scientists 341–350 publications: 83 scientists 351–360 publications: 75 scientists 361–370 publications: 69 scientists 371–380 publications: 52 scientists 381–390 publications: 54 scientists 391–400 publications: 56 scientists 401–410 publications: 44 scientists 411–420 publications: 40 scientists 421–430 publications: 36 scientists 431–440 publications: 25 scientists 441–450 publications: 25 scientists 451–460 publications: 32 scientists 461–470 publications: 29 scientists 471–480 publications: 21 scientists 481–490 publications: 26 scientists 491–500 publications: 25 scientists 501–510 publications: 17 scientists 511–520 publications: 18 scientists 521–530 publications: 15 scientists 531–540 publications: 22 scientists 541–550 publications: 12 scientists 551–560 publications: 15 scientists 561–570 publications: 11 scientists 571–580 publications: 19 scientists 581–590 publications: 9 scientists 591–600 publications: 9 scientists 601–610 publications: 7 scientists 611–620 publications: 11 scientists 621–630 publications: 5 scientists 631–640 publications: 5 scientists 641–650 publications: 6 scientists 651–660 publications: 3 scientists 661–670 publications: 3 scientists 671–680 publications: 4 scientists 681–686 publications: 3 scientists 687+ publications: 100 scientists
41 publications 687+

This scientist: 148 publications — 40th percentile

40% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 687 publications or more.

George R. Helz D-index placement in Environmental Sciences in 2026

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

30 D-Index: 12 scientists 31 D-Index: 26 scientists 32 D-Index: 51 scientists 33 D-Index: 88 scientists 34 D-Index: 123 scientists 35 D-Index: 163 scientists 36 D-Index: 206 scientists 37 D-Index: 267 scientists 38 D-Index: 265 scientists 39 D-Index: 275 scientists 40 D-Index: 321 scientists 41 D-Index: 343 scientists 42 D-Index: 305 scientists 43 D-Index: 336 scientists 44 D-Index: 330 scientists 45 D-Index: 348 scientists 46 D-Index: 291 scientists 47 D-Index: 275 scientists 48 D-Index: 272 scientists 49 D-Index: 273 scientists 50 D-Index: 263 scientists 51 D-Index: 232 scientists 52 D-Index: 266 scientists 53 D-Index: 217 scientists 54 D-Index: 199 scientists 55 D-Index: 177 scientists 56 D-Index: 202 scientists 57 D-Index: 204 scientists 58 D-Index: 166 scientists 59 D-Index: 177 scientists 60 D-Index: 166 scientists 61 D-Index: 152 scientists 62 D-Index: 143 scientists 63 D-Index: 150 scientists 64 D-Index: 124 scientists 65 D-Index: 119 scientists 66 D-Index: 120 scientists 67 D-Index: 118 scientists 68 D-Index: 82 scientists 69 D-Index: 98 scientists 70 D-Index: 94 scientists 71 D-Index: 105 scientists 72 D-Index: 74 scientists 73 D-Index: 84 scientists 74 D-Index: 70 scientists 75 D-Index: 67 scientists 76 D-Index: 78 scientists 77 D-Index: 60 scientists 78 D-Index: 59 scientists 79 D-Index: 52 scientists 80 D-Index: 47 scientists 81 D-Index: 38 scientists 82 D-Index: 48 scientists 83 D-Index: 42 scientists 84 D-Index: 42 scientists 85 D-Index: 43 scientists 86 D-Index: 29 scientists 87 D-Index: 37 scientists 88 D-Index: 29 scientists 89 D-Index: 30 scientists 90 D-Index: 34 scientists 91 D-Index: 20 scientists 92 D-Index: 22 scientists 93 D-Index: 17 scientists 94 D-Index: 19 scientists 95 D-Index: 24 scientists 96 D-Index: 21 scientists 97 D-Index: 20 scientists 98 D-Index: 24 scientists 99 D-Index: 17 scientists 100 D-Index: 17 scientists 101 D-Index: 21 scientists 102 D-Index: 25 scientists 103 D-Index: 18 scientists 104 D-Index: 26 scientists 105 D-Index: 19 scientists 106 D-Index: 15 scientists 107 D-Index: 10 scientists 108 D-Index: 13 scientists 109 D-Index: 15 scientists 110 D-Index: 12 scientists 111 D-Index: 8 scientists 112 D-Index: 7 scientists 113 D-Index: 9 scientists 114 D-Index: 6 scientists 115 D-Index: 12 scientists 116 D-Index: 7 scientists 117 D-Index: 8 scientists 118 D-Index: 3 scientists 119 D-Index: 5 scientists 120 D-Index: 7 scientists 121 D-Index: 2 scientists 122 D-Index: 4 scientists 123 D-Index: 8 scientists 124 D-Index: 7 scientists 125+ D-Index: 99 scientists
30 D-Index 125+

This scientist: 49 D-Index — 47th percentile

47% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 125 D-Index or more.

Research.com Recognitions

  • 2018 - Geochemistry Fellow Honor, Geochemical Society and the European Association of Geochemistry

Overview

George R. Helz is affiliated with the University of Maryland, College Park in the United States. Their research primarily falls within Earth and Planetary Sciences and Chemistry, with a particular focus on inorganic chemistry and geochemistry-related fields.

The scientist's work spans several subfields, including:

  • Inorganic Chemistry
  • Geochemistry and Petrology
  • Paleontology
  • Pollution
  • Artificial Intelligence

Key topics addressed in their publications are:

  • Radioactive element chemistry and processing
  • Geochemistry and Elemental Analysis
  • Paleontology and Stratigraphy of Fossils
  • Heavy metals in environment
  • Geochemistry and Geologic Mapping
  • Hydrocarbon exploration and reservoir analysis

Helz has contributed to several notable papers, including:

  • The Re/Mo redox proxy reconsidered, 2021, Geochimica et Cosmochimica Acta
  • Dissolved molybdenum asymptotes in sulfidic waters, 2021, Geochemical Perspectives Letters
  • Deposition of Mo, Re and U under contrasting redox conditions; assessment of the [Re/Mo]sw redox proxy, 2023, Geochimica et Cosmochimica Acta
  • Interpreting Re/Mo Ratios in Sedimentary Rocks, 2020, Goldschmidt Abstracts

Frequent co-authors collaborating with Helz include Igor Živković, Elvira Bura-Nakić, and Lucija Knežević.

The scientist has published repeatedly in venues such as:

  • Geochimica et Cosmochimica Acta
  • Geochemical Perspectives Letters
  • Goldschmidt Abstracts

Helz was recognized as a Geochemistry Fellow by the Geochemical Society and the European Association of Geochemistry in 2018.

Best Publications

  • Mechanism of molybdenum removal from the sea and its concentration in black shales: EXAFS evidence

    G.R. Helz;C.V. Miller;J.M. Charnock;J.M. Charnock;J.F.W. Mosselmans

  • Molybdenum(VI) speciation in sulfidic waters; stability and lability of thiomolybdates

    Britt E. Erickson;George R. Helz

  • Aquatic and Surface Photochemistry

    G. R. Helz;Richard G. Zepp;Donald G. Crosby

  • New model for molybdenum behavior in euxinic waters

    George R. Helz;Elvira Bura-Nakić;Nevenka Mikac;Irena Ciglenečki

  • Regional geochemistry of trace elements in Chesapeake Bay sediments

    S. A. Sinex;G. R. Helz

  • Reconstructing the rise of recent coastal anoxia; molybdenum in Chesapeake Bay sediments

    J.M. Adelson;G.R. Helz;C.V. Miller;C.V. Miller

  • Capture of molybdenum in pyrite-forming sediments: role of ligand-induced reduction by polysulfides

    Trent P. Vorlicek;Mani D. Kahn;Yasuhiro Kasuya;George R. Helz

  • The structure of amorphous copper sulfide precipitates: An X-ray absorption study

    R.A.D. Pattrick;J.F.W. Mosselmans;J.M. Charnock;K.E.R. England

  • Differential adsorption of molybdate and tetrathiomolybdate on pyrite (FeS2).

    Benjamin N. C. Bostick;Scott Fendorf;George R. Helz

  • Indirect photoreduction of aqueous chromium(Vi)

    Robert J. Kieber;George R. Helz

  • Solubility of ozone in aqueous solutions of 0-0.6 M ionic strength at 5-30.degree.C.

    Lynn F. Kosak-Channing;George R. Helz

  • Inorganic Speciation of Mercury in Sulfidic Waters: The Importance of Zero-Valent Sulfur

    Kristina E. Paquette;George R. Helz

  • Oligomerization in As (III) sulfide solutions: Theoretical constraints and spectroscopic evidence

    George R. Helz;John A. Tossell;John M. Charnock;Richard A.D. Pattrick

  • Thermodynamic model for arsenic speciation in sulfidic waters: A novel use of ab initio computations

    G.R. Helz;J.A. Tossell

  • Catalysis by mineral surfaces. Implications for Mo geochemistry in anoxic environments

    Trent P. Vorlicek;George R. Helz

  • Two-method verification of hydrogen peroxide determinations in natural waters

    Robert J. Kieber;G. R. Helz

  • Behavior of Mn, Fe, Cu, Zn, Cd and Pb discharged from a wastewater treatment plant into an estuarine environment

    G.R. Helz;R.J. Huggett;J.M. Hill

  • The solubility of copper in sulfidic waters: Sulfide and polysulfide complexes in equilibrium with covellite

    Damian Shea;George R Helz

  • Hydrogen peroxide effects on chromium oxidation state and solubility in four diverse, chromium-enriched soils.

    Melanie L. Rock;Bruce R. James;George R. Helz

  • Volatile chloro- and bromocarbons in coastal waters1

    George R. Helz;Rong Y. Hsu

  • Aquatic chemistry—An introduction emphasizing chemical equilibria in natural waters: By Werner Stumm and James J. Morgan. Second Edition, John Wiley and Sons, 1981, 780 pp. $45.00 (cloth), $27.50 (paper)

    George R. Helz

Frequent Co-Authors

John M. Charnock
John M. Charnock University of Manchester
David J. Vaughan
David J. Vaughan University of Manchester
Richard A. D. Pattrick
Richard A. D. Pattrick University of Manchester
Richard J. Walker
Richard J. Walker University of Maryland, College Park
James Farquhar
James Farquhar University of Maryland, College Park
Karen H. Johannesson
Karen H. Johannesson University of Massachusetts Boston
William F. McDonough
William F. McDonough University of Maryland, College Park
Robert J. Kieber
Robert J. Kieber University of North Carolina Wilmington
John A. Tossell
John A. Tossell University of Maryland, College Park
David Elmore
David Elmore Purdue University West Lafayette

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