Philip A. Helmke

12.1k total citations · 1 hit paper
52 papers, 9.8k citations indexed

About

Philip A. Helmke is a scholar working on Pollution, Astronomy and Astrophysics and Geochemistry and Petrology. According to data from OpenAlex, Philip A. Helmke has authored 52 papers receiving a total of 9.8k indexed citations (citations by other indexed papers that have themselves been cited), including 17 papers in Pollution, 11 papers in Astronomy and Astrophysics and 11 papers in Geochemistry and Petrology. Recurrent topics in Philip A. Helmke's work include Heavy metals in environment (15 papers), Planetary Science and Exploration (11 papers) and Geochemistry and Elemental Analysis (10 papers). Philip A. Helmke is often cited by papers focused on Heavy metals in environment (15 papers), Planetary Science and Exploration (11 papers) and Geochemistry and Elemental Analysis (10 papers). Philip A. Helmke collaborates with scholars based in United States, Norway and Sweden. Philip A. Helmke's co-authors include A. L. Page, M. A. Tabatabai, Richard H. Loeppert, P. N. Soltanpour, Cliff T. Johnston, M. E. Sumner, Donald L. Sparks, Kang Xia, Howard M. May and Marion Jackson and has published in prestigious journals such as Science, Journal of Geophysical Research Atmospheres and Environmental Science & Technology.

In The Last Decade

Philip A. Helmke

51 papers receiving 9.4k citations

Hit Papers

align trajectories

What are hit papers?

Hit papers significantly outperform the citation benchmark for their cohort. A paper qualifies if it has ≥500 total citations, achieves ≥1.5× the top-1% citation threshold for papers in the same subfield and year (this is the minimum needed to enter the top 1%, not the average within it), or reaches the top citation threshold in at least one of its specific research topics.

Methods of soil analysis. Part 3 - chemical methods.

1996 7.6k citations Philip A. Helmke et al. profile →

Peers — A (Enhanced Table)

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

Name	h						Papers	Cites
Philip A. Helmke United States	26	3.3k	2.4k	2.2k	1.9k	1.5k	52	9.8k
P. N. Soltanpour United States	22	4.2k 1.3×	2.3k 1.0×	3.5k 1.6×	1.8k 1.0×	1.4k 1.0×	62	10.1k
M. E. Sumner United States	19	3.8k 1.2×	1.8k 0.8×	2.4k 1.1×	1.7k 0.9×	1.4k 0.9×	41	9.1k
F. J. Stevenson United States	35	2.7k 0.8×	1.8k 0.7×	1.3k 0.6×	1.5k 0.8×	1.7k 1.2×	99	8.1k
D. R. Keeney United States	42	3.8k 1.1×	1.5k 0.6×	2.3k 1.0×	3.1k 1.6×	1.9k 1.3×	133	9.7k
Richard H. Loeppert United States	32	3.6k 1.1×	3.4k 1.4×	2.9k 1.3×	5.0k 2.6×	1.4k 1.0×	86	13.0k
Warren A. Dick United States	53	4.9k 1.5×	2.0k 0.8×	2.6k 1.2×	2.4k 1.2×	1.6k 1.1×	220	11.4k
M. Schnitzer Canada	64	6.2k 1.9×	3.5k 1.5×	2.8k 1.2×	2.7k 1.4×	3.7k 2.5×	299	17.6k
H.‐R. Schulten Germany	50	3.2k 1.0×	1.5k 0.6×	967 0.4×	1.1k 0.6×	2.3k 1.5×	283	10.4k
Martin H. Gerzabek Austria	51	3.8k 1.2×	1.8k 0.8×	1.3k 0.6×	1.4k 0.8×	2.1k 1.4×	217	10.0k
Ronald J. Smernik Australia	49	4.1k 1.2×	1.7k 0.7×	1.5k 0.7×	2.0k 1.1×	1.2k 0.8×	175	10.2k

Countries citing papers authored by Philip A. Helmke

Since Specialization

Citations

This map shows the geographic impact of Philip A. Helmke'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 Philip A. Helmke with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Philip A. Helmke more than expected).

Fields of papers citing papers by Philip A. Helmke

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Philip A. Helmke. 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 Philip A. Helmke. The network helps show where Philip A. Helmke may publish in the future.

Co-authorship network of co-authors of Philip A. Helmke

This figure shows the co-authorship network connecting the top 25 collaborators of Philip A. Helmke. A scholar is included among the top collaborators of Philip A. Helmke 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 Philip A. Helmke. Philip A. Helmke 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

Brown, David J., Kevin McSweeney, & Philip A. Helmke. (2004). Statistical, geochemical, and morphological analyses of stone line formation in Uganda. Geomorphology. 62(3-4). 217–237. 18 indexed citations

Helmke, Philip A., et al.. (2001). XANES Spectroscopy Studies of Cr(VI) Reduction by Thiols in Organosulfur Compounds and Humic Substances. Environmental Science & Technology. 35(6). 1134–1141. 67 indexed citations

Smolders, Erik, Carlos Alberto Bissani, & Philip A. Helmke. (1999). Liming reduces cadmium uptake from soil : why doesn't it work better ?. 2 indexed citations

Xia, Kang, Robert W. Taylor, William F. Bleam, & Philip A. Helmke. (1998). The Distribution of Cu(II) on Boehmite and Silica Surfaces: Correlating EPR Signal Loss with the Effective Bohr Magneton Number of Sorbed Ions. Journal of Colloid and Interface Science. 199(1). 77–82. 17 indexed citations

Helmke, Philip A., et al.. (1998). The pH dependence of free ionic activities and total dissolved concentrations of copper and cadmium in soil solution. Geoderma. 83(3-4). 281–291. 82 indexed citations

Bland, William L., Philip A. Helmke, & John M. Baker. (1997). High-resolution snow-water equivalent measurement by gamma-ray spectroscopy. Agricultural and Forest Meteorology. 83(1-2). 27–36. 7 indexed citations

Helmke, Philip A., et al.. (1997). Comparison of XANES Analyses and Extractions To Determine Chromium Speciation in Contaminated Soils. Environmental Science & Technology. 31(10). 2954–2959. 83 indexed citations

Bockheim, J. G., et al.. (1991). TRACE ELEMENT DISTRIBUTION IN SOILS FORMED IN THE INDIANA DUNES, U.S.A. Soil Science. 152(5). 340–350. 25 indexed citations

May, Howard M., D.G. Kinniburgh, Philip A. Helmke, & M. L. Jackson. (1986). Aqueous dissolution, solubilities and thermodynamic stabilities of common aluminosilicate clay minerals: Kaolinite and smectites. Geochimica et Cosmochimica Acta. 50(8). 1667–1677. 114 indexed citations

10.

May, Howard M., Philip A. Helmke, & M. L. Jackson. (1979). Determination of mononuclear dissolved aluminum in near-neutral waters. Chemical Geology. 24(3-4). 259–269. 39 indexed citations

11.

May, Howard M., Philip A. Helmke, & Marion Jackson. (1979). Gibbsite solubility and thermodynamic properties of hydroxy-aluminum ions in aqueous solution at 25°C. Geochimica et Cosmochimica Acta. 43(6). 861–868. 270 indexed citations

12.

Jackson, M. L., et al.. (1977). AGE AND URANIUM CONTENT OF SOIL MICAS FROM ANTARCTICA BY THE FISSION PARTICLE TRACK REPLICA METHOD. Soil Science. 123(4). 241–248. 9 indexed citations

13.

Haskin, L. A., et al.. (1973). Major and trace element abundances in samples from the lunar highlands. Lunar and Planetary Science Conference Proceedings. 4. 1275. 49 indexed citations

14.

Helmke, Philip A., et al.. (1973). Major and Trace Elements in Crystaline Rocks from Apollo 15. Lunar and Planetary Science Conference. 4. 349. 1 indexed citations

15.

Helmke, Philip A., et al.. (1973). Trace elements in fines from the Apollo 15 deep drill. Geochimica et Cosmochimica Acta. 37(3). 706–708. 3 indexed citations

16.

Helmke, Philip A. & L. A. Haskin. (1973). Rare-earth elements, Co, Sc and Hf in the Steens Mountain basalts. Geochimica et Cosmochimica Acta. 37(6). 1513–1529. 20 indexed citations

17.

Helmke, Philip A., et al.. (1972). Rare earths and other trace elements in Apollo 14 samples.. Lunar and Planetary Science Conference Proceedings. 3. 1275–220. 23 indexed citations

18.

Haskin, L. A., et al.. (1971). Rare Earths and Other Trace Elements in Apollo 12 Lunar Samples. Lunar and Planetary Science Conference. 2. 168–168. 5 indexed citations

19.

Allen, Ralph O., et al.. (1971). Rare-earth elements in Apollo 12 lunar materials. Lunar and Planetary Science Conference Proceedings. 2. 1307. 17 indexed citations

20.

Allen, Ralph O., Mark R. Anderson, L. A. Haskin, et al.. (1970). Rare earths and other trace elements in Apollo 11 lunar samples. Geochimica et Cosmochimica Acta Supplement. 1. 1213. 52 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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