Roald N. Leif

1.3k total citations
46 papers, 968 citations indexed

About

Roald N. Leif is a scholar working on Mechanics of Materials, Health, Toxicology and Mutagenesis and Plant Science. According to data from OpenAlex, Roald N. Leif has authored 46 papers receiving a total of 968 indexed citations (citations by other indexed papers that have themselves been cited), including 11 papers in Mechanics of Materials, 9 papers in Health, Toxicology and Mutagenesis and 9 papers in Plant Science. Recurrent topics in Roald N. Leif's work include Hydrocarbon exploration and reservoir analysis (11 papers), Pesticide Exposure and Toxicity (8 papers) and Atmospheric and Environmental Gas Dynamics (7 papers). Roald N. Leif is often cited by papers focused on Hydrocarbon exploration and reservoir analysis (11 papers), Pesticide Exposure and Toxicity (8 papers) and Atmospheric and Environmental Gas Dynamics (7 papers). Roald N. Leif collaborates with scholars based in United States, France and Brazil. Roald N. Leif's co-authors include Bernd R.T. Simoneit, Carlos A. Valdez, Saphon Hok, Bradley R. Hart, Brian Mayer, Armando Alcaraz, Débora A. Azevedo, A.C. Pinto, P. Albrecht and Francisco Radler de Aquino Neto and has published in prestigious journals such as SHILAP Revista de lepidopterología, PLoS ONE and Analytical Chemistry.

In The Last Decade

Roald N. Leif

45 papers receiving 925 citations

Peers

Countries citing papers authored by Roald N. Leif

Since Specialization

Citations

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

Fields of papers citing papers by Roald N. Leif

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Roald N. Leif. 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 Roald N. Leif. The network helps show where Roald N. Leif may publish in the future.

Co-authorship network of co-authors of Roald N. Leif

This figure shows the co-authorship network connecting the top 25 collaborators of Roald N. Leif. A scholar is included among the top collaborators of Roald N. Leif 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 Roald N. Leif. Roald N. Leif 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

#	Work	Indexed citations
1	Determination of fentanyl and acetylfentanyl in soil in their intact form and orthogonal corroboration of their presence by EI-GC-MS using chloroformate chemistry 2023 ·Forensic Chemistry ·Carlos A. Valdez, (unknown), Roald N. Leif	4
2	Benzyl trichloroacetimidates as derivatizing agents for phosphonic acids related to nerve agents by EI-GC-MS during OPCW proficiency test scenarios 2022 ·Scientific Reports ·(unknown), (unknown), Roald N. Leif, Carlos A. Valdez	5
3	Analysis, identification and confirmation of synthetic opioids using chloroformate chemistry: Retrospective detection of fentanyl and acetylfentanyl in urine and plasma samples by EI-GC-MS and HR-LC-MS 2022 ·PLoS ONE ·Carlos A. Valdez, Roald N. Leif, (unknown), Mark Dreyer	5
4	Trimethyloxonium-mediated methylation strategies for the rapid and simultaneous analysis of chlorinated phenols in various soils by electron impact gas chromatography–mass spectrometry 2022 ·Scientific Reports ·Carlos A. Valdez, Edmund P. Salazar, Roald N. Leif	6
5	Structural modification of fentanyls for their retrospective identification by gas chromatographic analysis using chloroformate chemistry 2021 ·Scientific Reports ·Carlos A. Valdez, Roald N. Leif, Robert D. Sanner, (unknown), Mark Dreyer, (unknown)	7
6	Carbene-based Difluoromethylation of Bisphenols: Application to the Instantaneous Tagging of Bisphenol A in Spiked Soil for Its Detection and Identification by Electron Ionization Gas Chromatography-Mass Spectrometry 2019 ·Scientific Reports ·Carlos A. Valdez, Roald N. Leif, Saphon Hok	7
7	Methylation protocol for the retrospective detection of isopropyl-, pinacolyl- and cyclohexylmethylphosphonic acids, indicative markers for the nerve agents sarin, soman and cyclosarin, at low levels in soils using EI-GC–MS 2019 ·The Science of The Total Environment ·Carlos A. Valdez, Roald N. Leif, Saphon Hok, (unknown), Edmund P. Salazar, Armando Alcaraz	25
8	Efficient derivatization of methylphosphonic and aminoethylsulfonic acids related to nerve agents simultaneously in soils using trimethyloxonium tetrafluoroborate for their enhanced, qualitative detection and identification by EI-GC–MS and GC–FPD 2018 ·Forensic Science International ·Carlos A. Valdez, (unknown), Roald N. Leif, Saphon Hok	24
9	Rhodotorula taiwanensis MD1149 produces hypoacetylated PEFA compounds with increased surface activity compared to Rhodotorula babjevae MD1169 2018 ·PLoS ONE ·Mathew G. Lyman, Bonnee Rubinfeld, Roald N. Leif, (unknown), Lawrence Dugan, Brian Souza	18
10	Analysis of chemical warfare agents by gas chromatography-mass spectrometry: methods for their direct detection and derivatization approaches for the analysis of their degradation products 2017 ·Reviews in Analytical Chemistry ·Carlos A. Valdez, Roald N. Leif, Saphon Hok, Bradley R. Hart	83
11	Effective methylation of phosphonic acids related to chemical warfare agents mediated by trimethyloxonium tetrafluoroborate for their qualitative detection and identification by gas chromatography-mass spectrometry 2016 ·Analytica Chimica Acta ·Carlos A. Valdez, Roald N. Leif, Armando Alcaraz	30
12	Chemical tagging of chlorinated phenols for their facile detection and analysis by NMR spectroscopy 2015 ·Analytical and Bioanalytical Chemistry ·Carlos A. Valdez, Roald N. Leif	6
13	An Efficient, Optimized Synthesis of Fentanyl and Related Analogs 2014 ·PLoS ONE ·Carlos A. Valdez, Roald N. Leif, Brian Mayer	74
14	The aqueous solubility of trichloroethene (TCE) and tetrachloroethene (PCE) as a function of temperature 2000 ·Applied Geochemistry ·Kevin G. Knauss, Michael J. Dibley, Roald N. Leif, (unknown), Roger D. Aines	37
15	Thermal cleanups using dynamic underground stripping and hydrous pyrolysis oxidation 1999 ·University of North Texas Digital Library (University of North Texas) ·Roger D. Aines, Kevin G. Knauss, Roald N. Leif, R. L. Newmark	2
16	Evidence for retrograde hydrothermal reactions in near surface sediments of Guaymas Basin, Gulf of California 1996 ·Applied Geochemistry ·(unknown), (unknown), Roald N. Leif, Bernd R.T. Simoneit, J.M. Gieskes	9
17	Confined-pyrolysis as an experimental method for hydrothermal organic synthesis 1995 ·Origins of Life and Evolution of Biospheres ·Roald N. Leif, Bernd R.T. Simoneit	19
18	Ketones in hydrothermal petroleums and sediment extracts from Guaymas Basin, Gulf of California 1995 ·Organic Geochemistry ·Roald N. Leif, Bernd R.T. Simoneit	62
19	Tetracyclic terpanes enriched in Devonian cuticle humic coals 1992 ·Fuel ·Guoying Sheng, Bernd R.T. Simoneit, Roald N. Leif, Xiaojing Chen, Jiamo Fu	31
20	Retrograde oxidation of hydrothermal precipitates and petroleum in Escanaba Trough sediments 1990 ·Applied Geochemistry ·J.M. Gieskes, Bernd R.T. Simoneit, (unknown), Roald N. Leif	4

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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