John David Hem

10.7k total citations
37 papers, 2.0k citations indexed

About

John David Hem is a scholar working on Geochemistry and Petrology, Water Science and Technology and Biomaterials. According to data from OpenAlex, John David Hem has authored 37 papers receiving a total of 2.0k indexed citations (citations by other indexed papers that have themselves been cited), including 12 papers in Geochemistry and Petrology, 10 papers in Water Science and Technology and 6 papers in Biomaterials. Recurrent topics in John David Hem's work include Geochemistry and Elemental Analysis (7 papers), Iron oxide chemistry and applications (6 papers) and Groundwater and Isotope Geochemistry (5 papers). John David Hem is often cited by papers focused on Geochemistry and Elemental Analysis (7 papers), Iron oxide chemistry and applications (6 papers) and Groundwater and Isotope Geochemistry (5 papers). John David Hem collaborates with scholars based in United States and United Kingdom. John David Hem's co-authors include Carol J. Lind, C. E. Roberson, W. D. Burrows, W.H. Durum, Henry Elderfield, W.L. Polzer, Ivan Barnes and Timothy Doak Steele and has published in prestigious journals such as Science, Journal of Geophysical Research Atmospheres and Geochimica et Cosmochimica Acta.

In The Last Decade

John David Hem

34 papers receiving 1.8k citations

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name	h						Papers	Cites
John David Hem United States	23	888	484	466	337	288	37	2.0k
RM McKenzie Australia	14	806 0.9×	377 0.8×	754 1.6×	225 0.7×	502 1.7×	22	1.9k
M. J. Dudas Canada	30	601 0.7×	409 0.8×	775 1.7×	196 0.6×	223 0.8×	99	2.8k
L. J. Evans Canada	29	478 0.5×	519 1.1×	1.0k 2.2×	492 1.5×	301 1.0×	67	2.8k
T.T. Chao United States	20	829 0.9×	850 1.8×	1.2k 2.6×	267 0.8×	442 1.5×	50	3.0k
J. A. Kittrick United States	26	382 0.4×	440 0.9×	440 0.9×	202 0.6×	220 0.8×	73	2.3k
A. J. Herbillon Belgium	29	645 0.7×	605 1.3×	409 0.9×	199 0.6×	198 0.7×	72	3.0k
Owen P. Bricker United States	25	965 1.1×	601 1.2×	279 0.6×	442 1.3×	172 0.6×	63	2.3k
Yasushi Kitano Japan	26	564 0.6×	427 0.9×	246 0.5×	285 0.8×	124 0.4×	92	2.7k
L. W. Zelazny United States	30	392 0.4×	715 1.5×	700 1.5×	458 1.4×	231 0.8×	99	3.3k
Fabienne Trolard France	29	712 0.8×	666 1.4×	404 0.9×	276 0.8×	316 1.1×	50	3.0k

Countries citing papers authored by John David Hem

Since Specialization

Citations

This map shows the geographic impact of John David Hem's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by John David Hem with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites John David Hem more than expected).

Fields of papers citing papers by John David Hem

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by John David Hem. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by John David Hem. The network helps show where John David Hem may publish in the future.

Co-authorship network of co-authors of John David Hem

This figure shows the co-authorship network connecting the top 25 collaborators of John David Hem. A scholar is included among the top collaborators of John David Hem based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with John David Hem. John David Hem is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

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20 of 20 papers shown

Hem, John David & Carol J. Lind. (1991). Coprecipitation mechanisms and products in manganese oxidation in the presence of cadmium. Geochimica et Cosmochimica Acta. 55(9). 2435–2451. 24 indexed citations

Hem, John David, C. E. Roberson, & Carol J. Lind. (1985). Thermodynamic stability of CoOOH and its coprecipitation with manganese. Geochimica et Cosmochimica Acta. 49(3). 801–810. 41 indexed citations

Hem, John David, et al.. (1982). Stability of βMnOOH and manganese oxide deposition from springwater. Water Resources Research. 18(3). 563–570. 46 indexed citations

Hem, John David. (1981). Rates of manganese oxidation in aqueous systems. Geochimica et Cosmochimica Acta. 45(8). 1369–1374. 144 indexed citations

Hem, John David. (1978). Redox processes at surfaces of manganese oxide and their effects on aqueous metal ions. Chemical Geology. 21(3-4). 199–218. 145 indexed citations

Burrows, W. D. & John David Hem. (1977). Aquatic aluminum: Chemistry, toxicology, and environmental prevalence∗. 7(2). 167–216. 114 indexed citations

Hem, John David & Timothy Doak Steele. (1975). Water quality. Reviews of Geophysics. 13(3). 461–468. 3 indexed citations

Hem, John David. (1975). Chemical Analysis of Ecological Materials S. E. Allen, H. M. Grimshaw, J. A. Parkinson, and C. Quarmby. Halsted Press, New York. $39.95. Quaternary Research. 5(3). 469–470. 1 indexed citations

Roberson, C. E. & John David Hem. (1973). Solubility of cryolite at 25° C and 1 atmosphere pressure. Journal research U. S. geological survey. 1(4). 483–485. 3 indexed citations

10.

Hem, John David & W.H. Durum. (1973). Solubility and Occurrence of Lead in Surface Water. American Water Works Association. 65(8). 562–568. 58 indexed citations

11.

Barnes, Ivan & John David Hem. (1973). Chemistry of Subsurface Waters. Annual Review of Earth and Planetary Sciences. 1(1). 157–181. 5 indexed citations

12.

Hem, John David. (1972). Graphical methods for representing form and stability of aqueous metal ions. Chemical Geology. 9(1-4). 119–132. 1 indexed citations

13.

Durum, W.H. & John David Hem. (1972). AN OVERVIEW OF TRACE ELEMENT DISTRIBUTION PATTERNS IN WATER¹. Annals of the New York Academy of Sciences. 199(1 Geochemical E). 26–36. 8 indexed citations

14.

Hem, John David. (1972). Chemistry and occurrence of cadmium and zinc in surface water and groundwater. Water Resources Research. 8(3). 661–679. 138 indexed citations

15.

Durum, W.H., et al.. (1971). Reconnaissance of selected minor elements in surface waters of the United States, October 1970. U.S. Geological Survey circular. 32 indexed citations

16.

Roberson, C. E. & John David Hem. (1968). Activity product constant of cryolite at 25°C and one atmosphere using selective-ion electrodes to estimate sodium and fluoride activities. Geochimica et Cosmochimica Acta. 32(12). 1343–1351. 10 indexed citations

17.

Hem, John David, et al.. (1963). Chemical composition of subsurface waters. USGS professional paper. 252 indexed citations

18.

Hem, John David. (1963). Some Aspects of Chemical Equilibrium in Ground Water ^a. Ground Water. 1(3). 30–34.

19.

Hem, John David. (1961). Stability Field Diagrams as Aids in Iron Chemistry Studies. American Water Works Association. 53(2). 211–232. 39 indexed citations

20.

Hem, John David. (1960). CHEMICAL EQUILIBRIUM DIAGRAMS FOR GROUND-WATER SYSTEMS / Les graphiques de l'équilibre chimique pour les systèmes des eaux souterrainnes. International Association of Scientific Hydrology Bulletin. 5(3). 45–53. 6 indexed citations

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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