J. Efer

756 total citations
20 papers, 633 citations indexed

About

J. Efer is a scholar working on Spectroscopy, Analytical Chemistry and Biomedical Engineering. According to data from OpenAlex, J. Efer has authored 20 papers receiving a total of 633 indexed citations (citations by other indexed papers that have themselves been cited), including 15 papers in Spectroscopy, 11 papers in Analytical Chemistry and 6 papers in Biomedical Engineering. Recurrent topics in J. Efer's work include Mass Spectrometry Techniques and Applications (12 papers), Analytical chemistry methods development (11 papers) and Analytical Chemistry and Chromatography (10 papers). J. Efer is often cited by papers focused on Mass Spectrometry Techniques and Applications (12 papers), Analytical chemistry methods development (11 papers) and Analytical Chemistry and Chromatography (10 papers). J. Efer collaborates with scholars based in Germany. J. Efer's co-authors include W. Engewald, Therese Koal, Arndt Asperger, Jörg Teske, André Schreiber, Stefan Müller, Luise Wennrich, M. Findeisen, A. Preiß and Uta Ceglarek and has published in prestigious journals such as Journal of Chromatography A, Chromatographia and Fresenius Journal of Analytical Chemistry.

In The Last Decade

J. Efer

20 papers receiving 607 citations

Peers — A (Enhanced Table)

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

Name	h						Papers	Cites
J. Efer Germany	15	417	361	152	148	96	20	633
Anthony R. J. Andrews United States	13	386 0.9×	515 1.4×	140 0.9×	156 1.1×	65 0.7×	23	679
R. T. Ghijsen Netherlands	16	469 1.1×	375 1.0×	141 0.9×	192 1.3×	59 0.6×	24	636
Lucie Šetková Canada	10	193 0.5×	289 0.8×	185 1.2×	173 1.2×	110 1.1×	11	562
Sergio Facchetti Italy	10	204 0.5×	302 0.8×	128 0.8×	167 1.1×	107 1.1×	14	554
Torben Nilsson Italy	8	210 0.5×	341 0.9×	177 1.2×	179 1.2×	95 1.0×	13	542
Jiu Ai United States	7	199 0.5×	377 1.0×	113 0.7×	129 0.9×	122 1.3×	8	541
Ian J. Barnabas United Kingdom	10	260 0.6×	299 0.8×	115 0.8×	117 0.8×	97 1.0×	10	494
Anna A. Boyd-Boland Canada	6	421 1.0×	636 1.8×	223 1.5×	144 1.0×	132 1.4×	9	770
Marcello Marchetti Italy	14	353 0.8×	448 1.2×	176 1.2×	178 1.2×	112 1.2×	29	934
O.M. Steijger Netherlands	13	203 0.5×	282 0.8×	228 1.5×	65 0.4×	127 1.3×	15	626

Countries citing papers authored by J. Efer

Since Specialization

Citations

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

Fields of papers citing papers by J. Efer

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by J. Efer. 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 J. Efer. The network helps show where J. Efer may publish in the future.

Co-authorship network of co-authors of J. Efer

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

Koal, Therese, Arndt Asperger, J. Efer, & W. Engewald. (2003). Simultaneous determination of a wide spectrum of pesticides in water by means of fast on-line SPE-HPLC-MS-MS—a novel approach. Chromatographia. 57(S1). S93–S101. 41 indexed citations

Asperger, Arndt, J. Efer, Therese Koal, & W. Engewald. (2002). Trace determination of priority pesticides in water by means of high-speed on-line solid-phase extraction–liquid chromatography–tandem mass spectrometry using turbulent-flow chromatography columns for enrichment and a short monolithic column for fast liquid chromatographic separation. Journal of Chromatography A. 960(1-2). 109–119. 114 indexed citations

Asperger, Arndt, J. Efer, Therese Koal, & W. Engewald. (2001). On the signal response of various pesticides in electrospray and atmospheric pressure chemical ionization depending on the flow-rate of eluent applied in liquid chromatography–tandem mass spectrometry. Journal of Chromatography A. 937(1-2). 65–72. 43 indexed citations

Drechsel, Derek A., et al.. (2001). GC analysis of trichloroacetic acid in water samples by large-volume injection and thermal decarboxylation in a programmed-temperature vaporizer. Chromatographia. 54(3-4). 151–154. 11 indexed citations

Schreiber, André, J. Efer, & W. Engewald. (2000). Application of spectral libraries for high-performance liquid chromatography–atmospheric pressure ionisation mass spectrometry to the analysis of pesticide and explosive residues in environmental samples. Journal of Chromatography A. 869(1-2). 411–425. 74 indexed citations

Engewald, W., Jörg Teske, & J. Efer. (1999). Programmed temperature vaporisers-based large volume injection in capillary gas chromatography. Journal of Chromatography A. 842(1-2). 143–161. 37 indexed citations

Engewald, W., Jörg Teske, & J. Efer. (1999). Programmed temperature vaporiser-based injection in capillary gas chromatography. Journal of Chromatography A. 856(1-2). 259–278. 37 indexed citations

Ceglarek, Uta, et al.. (1999). Determination of linear alkylbenzenesulfonates in communal wastewater by means of solid phase microextraction coupled with API-MS and HPLC-FLD. Fresenius Journal of Analytical Chemistry. 365(8). 674–681. 23 indexed citations

Teske, Jörg, J. Efer, & W. Engewald. (1998). Large-volume PTV injection: Comparison of direct water injection and in-vial extraction for GC analysis of triazines. Chromatographia. 47(1-2). 35–41. 25 indexed citations

10.

Teske, Jörg, J. Efer, & W. Engewald. (1997). Large-Volume PTV injection: New results on direct injection of water samples in GC analysis. Chromatographia. 46(11-12). 580–586. 16 indexed citations

11.

Wennrich, Luise, et al.. (1997). Determination of highly polar compounds in water samples around former ammunition plants. Chromatographia. 45(1). 91–98. 21 indexed citations

12.

Preiß, A., et al.. (1997). Analysis of nitrophenols and other polar nitroaromatic compounds in ammunition wastewater by high-field proton nuclear magnetic resonance (1H-NMR) spectroscopy and chromatographic methods. Fresenius Journal of Analytical Chemistry. 357(6). 676–683. 23 indexed citations

13.

Müller, Stefan, J. Efer, & W. Engewald. (1997). Water pollution screening by large-volume injection of aqueous samples and application to GC/MS analysis of a river Elbe sample. Fresenius Journal of Analytical Chemistry. 357(5). 558–560. 18 indexed citations

14.

Efer, J., et al.. (1996). High-performance liquid chromatographic analysis with electrochemical detection for residues of explosives in water samples around a former ammunition plant. Journal of Chromatography A. 730(1-2). 161–167. 41 indexed citations

15.

Wennrich, Luise, J. Efer, & W. Engewald. (1995). Gas chromatographic trace analysis of underivatized nitrophenols. Chromatographia. 41(5-6). 361–366. 35 indexed citations

16.

Müller, Stefan, J. Efer, & W. Engewald. (1994). Gas chromatographic water analysis by direct injection of large sample volumes in an adsorbent-packed PTV injector. Chromatographia. 38(11-12). 694–700. 42 indexed citations

17.

Engewald, W., Thomas J. Knobloch, & J. Efer. (1993). Flüchtige organische Verbindungen in Emissionen aus dem Hausbrand von Braunkohle. Umweltwissenschaften und Schadstoff-Forschung. 5(6). 303–308. 4 indexed citations

18.

Efer, J., et al.. (1993). Indirect GC determination of ethephon in drinking water by a combination of reactive headspace sampling with adsorptive enrichment/thermal desorption. Chromatographia. 37(7-8). 361–364. 13 indexed citations

19.

Efer, J., et al.. (1990). Application of selectivity tuning in series-coupled capillary GC columns for the exact quantification of the quenching effect in FPD detection. Chromatographia. 29(3-4). 115–119. 10 indexed citations

20.

Efer, J., et al.. (1965). Die Stabilität der Brenzkatechinviolett‐Komplexe des Monobutylzinntrichlorids und des Dibutylzinndichlorids in Abhängigkeit vom pH‐Wert; Titrimetrische Bestimmung der Monobutylzinn‐Komponente in technischem Dibutylzinndichlorid und Dibutylzinnoxid. Zeitschrift für Chemie. 5(10). 390–391. 5 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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