Extramural Research
Bibliometrics
Grantee Research Project Results
Bibliometric Analysis for Papers on Topics Related to Land/Remediation Research
January 5, 2006
This is a bibliometric analysis of the papers prepared by intramural and extramural researchers of the U.S. Environmental Protection Agency (EPA) on topics related to land/remediation research. For this analysis, 1,141 papers were reviewed. These 1,141 papers, published from 1995 to 2005, were cited 14,477 times in the journals covered by Thomson’s Web of Science.1 Of these 1,141 papers, 1,030 (90.3%) have been cited at least once in a journal.
The analysis was completed using Thomson's Essential Science Indicators (ESI) and Journal Citation Reports (JCR) as benchmarks. ESI provides access to a unique and comprehensive compilation of essential science performance statistics and science trends data derived from Thomson’s databases. The chief indicators of output, or productivity, are journal article publication counts. For influence and impact measures, ESI employs both total citation counts and cites per paper scores. The former reveals gross influence while the latter shows weighted influence, also called impact. JCR presents quantifiable statistical data that provide a systematic, objective way to evaluate the world’s leading journals and their impact and influence in the global research community.
Summary of Analysis
More than one-quarter of the land/remediation publications are highly cited papers. A review of the citations indicates that 289 (25.3%) of the land/remediation papers qualify as highly cited when using the ESI criteria for the top 10% of highly cited publications. Forty-four (3.9%) of the land/remediation papers qualify as highly cited when using the criteria for the top 1%. Three (0.3%) of these papers qualify as very highly cited (in the top 0.1%). None of the papers meet the highest threshold (the top 0.01%) for highly cited papers.
The land/remediation papers are more highly cited than the average paper. Using the ESI average citation rates for papers published by field as the benchmark, in 11 of the 14 fields in which the EPA land/remediation papers were published, the ratio of actual to expected cites is greater than 1, indicating that the land/remediation papers are more highly cited than the average papers in those fields.
Nearly one-quarter of the land/remediation papers are published in very high impact journals. Two hundred seventy-six (276) of 1,141 papers were published in the top 10% of journals ranked by JCR Impact Factor, representing 24.2% of EPA’s land/remediation papers. More than one-fifth of the land/remediation papers are published in the top 10% of journals ranked by JCR Immediacy Factor. Two-hundred forty-three (243) of the 1,141 papers appear in the top 10% of journals, representing 21.3% of EPA's land/remediation papers.
Twenty of the land/remediation publications qualified as hot papers. ESI establishes citation thresholds for hot papers, which are selected from the highly cited papers in different fields, but the time frame for citing and cited papers is much shorter—papers must be cited within 2 years of publication and the citations must occur in a 2-month time period. Using the current hot paper thresholds established by ESI as a benchmark, 20 of the land/remediation papers, representing 1.8% of the land/remediation publications, were identified as hot papers in the analysis.
The authors of the land/remediation papers cite themselves less than the average self-citation rate. Seven hundred sixty-seven(767) of the 14,477 cites are author self-cites. This 5.3% author self-citation rate is well below the accepted range of 10-30% author self-citation rate.
Highly Cited Land/Remediation Publications
The 1,141 land/remediation papers reviewed for this analysis covered 14 of the 22 ESI fields of research. The distribution of the papers among these 14 fields and the number of citations by field are presented in Table 1.
Table 1. Land/Remediation Papers by ESI Fields
|
No. of Citations |
ESI Field |
No. of EPA Ecosystem Papers |
Average Cites/Paper |
|
5,428 |
Environment/Ecology |
495 |
10.96 |
|
4,571 |
Engineering |
334 |
13.68 |
|
1,678 |
Chemistry |
129 |
13.01 |
|
1,491 |
Microbiology |
69 |
21.61 |
|
413 |
Pharmacology & Toxicology |
28 |
14.75 |
|
407 |
Geosciences |
47 |
8.66 |
|
153 |
Physics |
11 |
13.91 |
|
115 |
Biology & Biochemistry |
10 |
11.50 |
|
107 |
Agricultural Sciences |
8 |
13.38 |
|
58 |
Plant & Animal Science |
5 |
11.60 |
|
48 |
Materials Science |
2 |
24.00 |
|
6 |
Multidisciplinary |
1 |
6.00 |
|
1 |
Clinical Medicine |
1 |
1.00 |
|
1 |
Mathematics |
1 |
1.00 |
Total = 14,477 |
Total = 1,141 |
12.69 |
There were 289 (25.3% of the papers analyzed) highly cited EPA land/remediation papers in 11 of the 14 fields—Engineering, Environment/Ecology, Chemistry, Microbiology, Pharmacology & Toxicology, Geosciences, Physics, Agricultural Sciences, Materials Science, Plant & Animal Science, and Multidisciplinary—when using the ESI criteria for the top 10% of papers. Table 2 shows the number of EPA papers in those 11 fields that met the top 10% threshold in ESI.
Forty-four (3.9%) of the papers analyzed qualified as highly cited when using the ESI criteria for the top 1% of papers. These papers were categorized in five fields—Engineering, Environment/Ecology, Microbiology, Pharmacology & Toxicology, and Materials Science. Table 3 shows the 44 papers by field that met the top 1% threshold in ESI. There were three (0.3% of the papers analyzed) very highly cited EPA land/remediation papers in two fields—Engineering and Pharmacology & Toxicology. These three papers met the top 0.1% threshold in ESI. None of the land/remediation papers met the highest threshold for highly cited papers (i.e., the top 0.01% threshold) in ESI.
Table 2. Number of Highly Cited Land/Remediation Papers by Field (top 10%)
No. of Citations |
ESI Field |
No. of Papers |
Average Cites/Paper |
% of EPA Papers in Field |
3,967 |
Engineering |
173 |
22.93 |
51.80% |
2,387 |
Environment/Ecology |
66 |
36.17 |
13.33% |
776 |
Chemistry |
17 |
45.65 |
13.18% |
554 |
Microbiology |
8 |
69.25 |
11.59% |
242 |
Pharmacology & Toxicology |
7 |
34.57 |
25.00% |
164 |
Geosciences |
7 |
23.43 |
14.89% |
127 |
Physics |
4 |
31.75 |
36.36% |
82 |
Agricultural Sciences |
3 |
27.33 |
37.50% |
47 |
Materials Science |
1 |
47.00 |
50.00% |
26 |
Plant & Animal Science |
2 |
13.00 |
40.00% |
6 |
Multidisciplinary |
1 |
6.00 |
100.00% |
Total = 8,378 |
Total = 289 |
28.99 |
Table 3. Number of Highly Cited Land/Remediation Papers by Field (top 1%)
No. of Citations |
ESI Field |
No. of Papers |
Average Cites/Paper |
% of EPA Papers in Field |
||||||||||
1,707 |
Engineering |
37 |
46.14 |
11.08% |
||||||||||
234 |
Environment/Ecology |
2 |
117.00 |
0.40% |
||||||||||
202 |
Chemistry |
2 |
83.00 |
3.57% |
||||||||||
119 |
Microbiology |
1 |
119.00 |
1.45% |
||||||||||
83 |
Pharmacology & Toxicology |
1 |
83.00 |
3.57% |
||||||||||
47 |
Materials Science |
1 |
47.00 |
50.00% |
||||||||||
Total = 2,392 |
Total = 44 |
54.36 |
|
The citations for the highly cited papers in the top 1% are presented in Tables 4 through 9. The citations for the very highly cited papers are listed in Table 10.
Table 4. Highly Cited Land/Remediation Papers in the Field of Engineering (top 1%)
No. of Cites |
First Author |
Paper |
59 |
Hopkins GD |
Field evaluation of in-situ aerobic cometabolism of trichloroethylene and 3-dichloroethylene isomers using phenol and toluene as the primary substrates. Environmental Science & Technology 1995;29(6):1628-1637. |
53 |
Helland BR |
Reductive dechlorination of carbon-tetrachloride with elemental iron. Journal of Hazardous Materials 1995;41(2-3):205-216. |
51 |
Chiu PC |
Metallocoenzyme-mediated reductive transformation of carbon-tetrachloride in titanium (III) citrate aqueous solution. Environmental Science & Technology 1995;29(3):595-603. |
50 |
Ankley GT |
Effects of light-intensity on the phototoxicity of fluoranthene to a benthic macroinvertebrate. Environmental Science & Technology 1995;29(11):2828-2833. |
103 |
Pennell KD |
Influence of viscous and buoyancy forces on the mobilization of residual tetrachloroethylene during surfactant flushing. Environmental Science & Technology 1996;30(4):1328-1335. |
57 |
Siantar DP |
Treatment of 1,2-dibromo-3-chloropropane and nitrate-contaminated water with zero-valent iron or hydrogen/palladium catalysts. Water Research 1996;30(10):2315-2322. |
80 |
Hughes JB |
Transformation of TNT by aquatic plants and plant tissue cultures. Environmental Science & Technology 1997;31(1):266-271. |
57 |
Reinhard M |
In situ BTEX biotransformation under enhanced nitrate- and sulfate-reducing conditions. Environmental Science & Technology 1997;31(1):28-36. |
49 |
Burken JG |
Uptake and metabolism of atrazine by poplar trees. Environmental Science & Technology 1997;31(5):1399-1406. |
47 |
Pennell KD |
Solubilization of dodecane, tetrachloroethylene, and 1,2-dichlorobenzene in micellar solutions of ethoxylated nonionic surfactants. Environmental Science & Technology 1997;31(5):1382-1389. |
74 |
Yang YR |
Competition for hydrogen within a chlorinated solvent dehalogenating anaerobic mixed culture. Environmental Science & Technology 1998;32(22):3591-3597. |
71 |
Kan AT |
Irreversible sorption of neutral hydrocarbons to sediments: experimental observations and model predictions. Environmental Science & Technology 1998;32(7):892-902. |
69 |
Davis JA |
Application of the surface complexation concept to complex mineral assemblages. Environmental Science & Technology 1998;32(19):2820-2828. |
66 |
Burken JG |
Predictive relationships for uptake of organic contaminants by hybrid poplar trees. Environmental Science & Technology 1998;32(1):3379-3385. |
52 |
McCarty PL |
Full scale evaluation of in situ cometabolic degradation of trichloroethylene in groundwater through toluene injection. Environmental Science & Technology 1998;21(1):88-100. |
51 |
Annable MD |
Partitioning tracers for measuring residual NAPL: field-scale test results. Journal of Environmental Engineering-ASCE 1998;124(6):498-503. |
50 |
Jawitz JW |
Field implementation of a Winsor type I surfactant/alcohol mixture for in situ solubilization of a complex LNAPL as a single phase microemulsion. Environmental Science & Technology 1998;32(4):523-530. |
46 |
Till BA |
Fe(0)-supported autotrophic dentrification. Environmental Science & Technology 1998;32(5):634-639. |
43 |
Butler EC |
Effects of solution composition on pH on the reductive dechlorination of hexachloroethane by iron sulfide. Environmental Science & Technology 1998;32(9):1276-1284. |
43 |
Herdan J |
Field evaluation of an electrochemical probe for in situ screening of heavy metals in groundwater. Environmental Science & Technology 1998;32(1):131-136. |
88 |
Xia GS |
Adsorption-partitioning uptake of nine low-polarity organic chemicals on a natural sorbent. Environmental Science & Technology 1999;33(2):262-269. |
54 |
Su CM |
Kinetics of trichloroethene reduction by zerovalent iron and tin: pretreatment effect, apparent activation energy, and intermediate products. Environmental Science & Technology 1999;33(1):163-168. |
37 |
Bhadra R |
Confirmation of conjugation processes during TNT metabolism by axenic plant roots. Environmental Science & Technology 1999;33(3):446-452. |
41 |
Ford RG |
The nature of Zn precipitates formed in the presence of pyrophyllite. Environmental Science & Technology 2000;34(12):2479-2483. |
40 |
Burkhard LP |
Estimating dissolved organic carbon partition coefficients for nonionic organic chemicals. Environmental Science & Technology 2000;34(22):4663-4668. |
56 |
Su CM |
Arsenate and arsenite removal by zerovalent iron: kinetics, redox transformation, and implications for in situ groundwater remediation. Environmental Science & Technology 2001;35(7):1487-1492. |
37 |
Williams AGB |
Kinetics of Cr(VI) reduction by carbonate green rust. Environmental Science & Technology 2001;35(17):3488-3494. |
27 |
Ryan JA |
Formation of chloropyromorphite in a lead-contaminated soil amended with hydroxyapatite. Environmental Science & Technology 2001;35(18):3798-3803. |
27 |
McCormick ML |
Carbon tetrachloride transformation in a model iron-reducing culture: relative kinetics of biotic and abiotic reactions. Environmental Science & Technology 2002;36(3):403-410. |
25 |
Rockne KJ |
Distributed sequestration and release of PAHs in weathered sediment: the role of sediment structure and organic carbon properties. Environmental Science & Technology 2002;36(12):2636-2644. |
24 |
Kneebone PE |
Deposition and fate of arsenic in iron- and arsenic-enriched reservoir sediments. Environmental Science & Technology 2002;36(3):381-386. |
21 |
Lu YF |
Demonstration of the “conditioning effect” in soil organic matter in support of a pore deformation mechanism for sorption hysteresis. Environmental Science & Technology 2002;36(21):4553-4561. |
27 |
Braida WJ |
Sorption hysteresis of benzene in charcoal particles. Environmental Science & Technology 2003;37(2):409-417. |
10 |
Nguyen TH |
Sorption nonlinearity for organic contaminants with diesel soot: method development and isotherm interpretation. Environmental Science & Technology 2004;38(3):3595-3603. |
10 |
Williams AGB |
Spectroscopic evidence for Fe(II)-Fe(III) electron transfer at the iron oxide-water interface. Environmental Science & Technology 2004;38(18):4782-4790. |
7 |
Ryan JA |
Reducing children’s risk from lead in soil. Environmental Science & Technology 2004;38(1):18A-24A. |
5 |
Kuder T |
Enrichment of stable carbon and hydrogen isotopes during anaerobic biodegradation of MTBE: microcosm and field evidence. Environmental Science & Technology 2005;39(1):213-220. |
Table 5. Highly Cited Land/Remediation Papers in the Field of
Environment/Ecology (top 1%)
No. of Cites |
First Author |
Paper |
125 |
Ankley GT |
Technical basis and proposal for deriving sediment quality criteria for metals. Environmental Toxicology and Chemistry 1995;15(12):2056-2066. |
109 |
Haggerty R |
Multiple-rate mass-transfer for modeling diffusion and surface-reactions in media with pore-scale heterogeneity. Water Resources Research 1995;31(10):2383-2400. |
Table 6. Highly Cited Land/Remediation Papers in the Field of Chemistry (top 1%)
No. of Cites |
First Author |
Paper |
113 |
Wang J |
Sol-gel-derived thick-film amperometric immunosensors. Analytical Chemistry 1998;70(6):1171-1175. |
89 |
Ravikovitch PI |
Unified approach to pore size characterization of microporous carbonaceous materials from N-2, Ar, and CO 2 adsorption isotherms. Langmuir 2000;16(5):2311-2320. |
Table 7. Highly Cited Land/Remediation Papers in the Field of
Microbiology (top 1%)
No. of Cites |
First Author |
Paper |
119 |
Macnaughton SJ |
Microbial population changes during bioremediation of an experimental oil spill. Applied and Environmental Microbiology 1999;65(8):3566-3574. |
Table 8. Highly Cited Land/Remediation Papers in the Field of
Pharmacology & Toxicology (top 1%)
No. of Cites |
First Author |
Paper |
83 |
Ding XX |
Human extrahepatic cytochromes P450: function in xenobiotic metabolism and tissue-selective chemical toxicity in the respiratory and gastrointestinal tracts. Annual Review of Pharmacology and Toxicology 2003;43:149-173. |
Table 9. Highly Cited Land/Remediation Papers in the Field of Materials Science (top 1%)
No. of Cites |
First Author |
Paper |
47 |
Neimark AV |
Capillary condensation in MMS and pore structure characterization. Microporous and Mesoporous Materials 2001;44:697-707. |
Table 10. Very Highly Cited Land/Remediation Papers (Top 0.1%)
Field |
No. of Cites |
First Author |
Paper |
Engineering |
27 |
Braida WJ |
Sorption hysteresis of benzene in charcoal particles. Environmental Science & Technology 2003;37(2):409-417. |
5 |
Kuder T |
Enrichment of stable carbon and hydrogen isotopes during anaerobic biodegradation of MTBE: microcosm and field evidence. Environmental Science & Technology 2005;39(1):213-220. |
|
Pharmacology & Toxicology |
83 |
Ding XX |
Human extrahepatic cytochromes P450: function in xenobiotic metabolism and tissue-selective chemical toxicity in the respiratory and gastrointestinal tracts. Annual Review of Pharmacology & Toxicology 2003;43:149-173. |
Ratio of Actual Cites to Expected Citation Rates
The expected citation rate is the average number of cites that a paper published in the same journal in the same year and of the same document type (article, review, editorial, etc.) has received from the year of publication to the present. Using the ESI average citation rates for papers published by field as the benchmark, in 11 of the 14 fields in which the EPA land/remediation papers were published, the ratio of actual to expected cites is greater than 1, indicating that the EPA papers are more highly cited than the average papers in those fields (see Table 11).
Table 11. Ratio of Average Cites to Expected Cites for
Land/Remediation Papers by Field
ESI Field |
Total Cites |
Expected Cite Rate |
Ratio |
Environment/Ecology |
5,428 |
4,264.93 |
1.27 |
Engineering |
4,571 |
1,115.34 |
4.10 |
Chemistry |
1,678 |
1,261.94 |
1.33 |
Microbiology |
1,491 |
1,183.65 |
1.26 |
Pharmacology & Toxicology |
413 |
293.85 |
1.40 |
Geosciences |
407 |
399.33 |
1.02 |
Physics |
153 |
82.22 |
1.86 |
Biology & Biochemistry |
115 |
123.21 |
0.93 |
Agricultural Sciences |
107 |
42.32 |
2.53 |
Plant & Animal Science |
58 |
30.35 |
1.91 |
Materials Science |
48 |
11.84 |
4.05 |
Multidisciplinary |
6 |
2.28 |
2.63 |
Clinical Medicine |
1 |
1.70 |
0.59 |
Mathematics |
1 |
3.77 |
0.26 |
JCR Benchmarks
The Impact Factor is a well known metric in citation analysis. It is a measure of the frequency with which the average article in a journal has been cited in a particular year. The Impact Factor helps evaluate a journal’s relative importance, especially when compared to others in the same field. The Impact Factor is calculated by dividing the number of citations in the current year to articles published in the 2 previous years by the total number of articles published in the 2 previous years.
Table 12 indicates the number of land/remediation papers published in the top 10% of journals, based on the JCR Impact Factor. Two hundred seventy-six (276) of 1,141 papers were published in the top 10% of journals, representing 24.2% of EPA’s land/remediation papers.
Table 12. Land/Remediation Papers in Top 10% of Journals by JCR Impact Factor
EPA Land/Remediation Papers in that Journal |
Journal |
Impact Factor (IF) |
JCR IF Rank |
180 |
Environmental Science & Technology |
3.557 |
540 |
23 |
Applied and Environmental Microbiology |
3.810 |
470 |
12 |
Environmental Health Perspectives |
3.929 |
439 |
11 |
Analytical Chemistry |
5.450 |
243 |
8 |
Journal of Bacteriology |
4.146 |
385 |
6 |
Drug Metabolism and Disposition |
3.836 |
461 |
5 |
Electrophoresis |
3.743 |
482 |
4 |
Langmuir |
3.295 |
622 |
3 |
Applied Catalysis B-Environmental |
4.042 |
411 |
3 |
Toxicological Sciences |
3.391 |
591 |
2 |
Journal of Chromatography A |
3.359 |
602 |
2 |
Geochimica et Cosmochimica Acta |
3.811 |
468 |
2 |
Journal of the American Society for Mass Spectrometry |
3.760 |
479 |
2 |
Biosensors & Bioelectronics |
3.251 |
636 |
1 |
Current Opinion in Biotechnology |
8.080 |
129 |
1 |
Siam Review |
6.118 |
203 |
1 |
Journal of Pharmacology and Experimental Therapeutics |
4.335 |
356 |
1 |
Ecology |
4.104 |
394 |
1 |
Journal of Analytical Atomic Spectrometry |
3.926 |
440 |
1 |
Pediatrics |
3.903 |
447 |
1 |
TRAC-Trends in Analytical Chemistry |
3.888 |
452 |
1 |
Biochemical Pharmacology |
3.436 |
581 |
1 |
Ecological Applications |
3.287 |
623 |
1 |
Advances in Agronomy |
3.212 |
652 |
1 |
Chemical Geology |
3.174 |
670 |
1 |
Journal of Mass Spectrometry |
3.056 |
722 |
1 |
Limnology and Oceanography |
3.024 |
737 |
Total = 276 |
|||
Immediacy Index
The journal Immediacy Index is a measure of how quickly the average article in a journal is cited. It indicates how often articles published in a journal are cited within the year they are published. The Immediacy Index is calculated by dividing the number of citations to articles published in a given year by the number of articles published in that year.
Table 13 indicates the number of EPA papers published in the top 10% of journals, based on the JCR Immediacy Index. Two hundred forty-three (243) of the 1,141 papers appear in the top 10% of journals, representing 21.3% of EPA’s land/remediation papers.
Table 13. Land/Remediation Papers in Top 10% of Journals by JCR Immediacy Index
EPA Land/Remediation Papers in that Journal |
Journal |
Immediacy Index (II) |
JCR II Rank |
180 |
Environmental Science & Technology |
0.623 |
617 |
12 |
Environmental Health Perspectives |
1.202 |
202 |
11 |
Analytical Chemistry |
0.885 |
346 |
8 |
Journal of Bacteriology |
0.827 |
383 |
6 |
Drug Metabolism and Disposition |
0.590 |
676 |
5 |
Electrophoresis |
0.575 |
697 |
4 |
Langmuir |
0.566 |
717 |
2 |
Tetrahedron Letters |
0.583 |
681 |
2 |
Hydrobiologia |
0.681 |
532 |
2 |
Geochimica et Cosmochimica Acta |
0.680 |
535 |
2 |
Journal of the American Society for Mass Spectrometry |
0.575 |
697 |
1 |
Ecotoxicology |
1.450 |
151 |
1 |
Pediatrics |
0.935 |
311 |
1 |
TRAC-Trends in Analytical Chemistry |
0.583 |
681 |
1 |
Ecology |
0.590 |
676 |
1 |
Current Opinion in Biotechnology |
0.919 |
322 |
1 |
Marine Geology |
0.842 |
373 |
1 |
Journal of Pharmacology and Experimental Therapeutics |
0.797 |
419 |
1 |
Ecological Applications |
0.747 |
466 |
1 |
Journal of Analytical Atomic Spectrometry |
0.641 |
588 |
Total = 243 |
|||
Hot Papers
ESI establishes citation thresholds for hot papers, which are selected from the highly cited papers in different fields, but the time frame for citing and cited papers is much shorter—papers must be cited within 2 years of publication and the citations must occur in a 2-month time period. Papers are assigned to 2-month periods and thresholds are set for each period and field to select 0.1% of papers. There were no hot papers identified for the current 2-month period (i.e., September-October 2005), but there was one hot paper identified from previous periods.
Using the current hot paper thresholds established by ESI as a benchmark, 20 hot papers, representing 1.8% of the land/remediation papers, were identified in the fields of Engineering, Environment/Ecology, Pharmacology & Toxicology, and Microbiology. The hot papers are listed in Table 14.
Table 14. Hot Papers Identified Using Current ESI Thresholds
|
Field |
ESI Hot Papers Threshold |
No. of Cites in 2-Month Period |
Paper |
Engineering |
5 |
6 cites in February-March 2003 |
Williams AGB, Scherer MM. Kinetics of Cr(VI) reduction by carbonate green rust. Environmental Science & Technology 2001;35(17):3488-3494. |
5 |
6 cites in August-September 1999 |
McCarty PL, et al. Full scale evaluation of in situ cometabolic degradation of trichloroethylene in groundwater through toluene injection. Environmental Science & Technology 1998;32(1):88-100. |
|
5 |
5 cites in November-December 2001 |
Ford RG, Sparks DL. The nature of Zn precipitates formed in the presence of pyrophyllite. Environmental Science & Technology 2000;34(12):2479-2483. |
|
5 |
5 cites in July-August 1999 |
Herdan J, et al. Field evaluation of an electrochemical probe for in situ screening of heavy metals in groundwater. Environmental Science & Technology 1998;32(1):131-136. |
|
4 |
5 cites in September- October 2005 |
Nguyen TH, et al. Sorption nonlinearity for organic contaminants with diesel soot: method development and isotherm interpretation. Environmental Science & Technology 2004;38(13):3595-3603. |
|
4 |
5 cites in January-February 2005 |
Ryan JA, et al. Reducing children’s risk from lead in soil. Environmental Science & Technology 2004;38(1):18A-24A. |
|
4 |
5 cites in August-September 2005 |
Williams AGB, Scherer MM. Spectroscopic evidence for Fe(II)-Fe(III) electron transfer at the iron oxide-water interface. Environmental Science & Technology 2004;38(18):4782-4790. |
|
4 |
5 cties in August-September 2002 |
Pruden A, et al. Biodegradation of methyl tert-butyl ether under various substrate conditions. Environmental Science & Technology 2001;35(21):4235-4241. |
|
Engineering |
4 |
5 cites in December 1999-January 2000 |
Davis JA, et al. Application of the surface complexation concept to complex mineral assemblages. Environmental Science & Technology 1998;32(19):2820-2828. |
4 |
5 cites in May-June 1997 |
Schnoor JL, et al. Phytoremediation of organic and nutrient contaminants. Environmental Science & Technology 1995;29(7):A318-A323. |
|
4 |
4 cites in April-May 2003 |
Rockne KJ, et al. Distributed sequestration and release of PAHs in weathered sediment: the role of sediment structure and organic carbon. Environmental Science & Technology 2002;36(12):2636-2644. |
|
4 |
4 cites in February-March 2002 |
Reddy CM, et al. Stable chlorine isotopic compositions of aroclors and aroclor-contaminated sediments. Environmental Science & Technology 2000;34(13):2866-2870. |
|
4 |
4 cites in June-July 1998 |
Hurst CJ, et al. Soil gas oxygen tension and pentachlorophenol biodegradation. Journal of Environmental Engineering-ASCE 1997;123(4):364-370. |
|
3 |
3 cites in June-July 1997 |
Anderson JE, McCarty PL. Effect of three chlorinated ethenes on growth rates for a methanotrophic mixed culture. Environmental Science & Technology 1996;30(12):3517-3524. |
|
Environment/ Ecology |
8 |
13 cites in November-December 1996 |
Berry WJ, et al. Predicting the toxicity of metal-spiked laboratory sediments using acid-volatile sulfide and interstitial water normalizations. Environmental Toxicology and Chemistry 1996;15(12):2067-2079. |
8 |
11 cites in December 1996 |
Hansen DJ, et al. Chronic effect of cadmium in sediments on colonization by benthic marine organisms: an evaluation of the role of interstitial cadmium and acid-volatile sulfide in biological availability. Environmental Toxicology and Chemistry 1996;15(12):2126-2137. |
|
Environment/ Ecology |
8 |
10 cites in December 1996 |
Hansen DJ, et al. Predicting the toxicity of metal-contaminated field sediments using interstitial concentration of metals and acid-volatile sulfide. Environmental Toxicology and Chemistry 1996;15(12):2080-2094. |
8 |
9 cites in December 1996 |
Liber K, et al. Effects of acid-volatile sulfide on zinc bioavailability and toxicity to benthic macroinvertebrates: a spiked-sediment field experiment. Environmental Toxicology and Chemistry 1996;15(12):2113-2125. |
|
Pharmacology & Toxicology |
5 |
9 cites in September-October 2004 |
Ding XX, Kaminsky LS. Human extrahepatic cytochromes P450: function in xenobiotic metabolism and tissue-selective chemical toxicity in the respiratory and gastrointestinal tracts. Annual Review of Pharmacology and Toxicology 2003;43:149-173. |
Microbiology |
3 |
3 cites in May-June 1995 |
Ely RL, et al. A cometabolic kinetics model incorporating enzyme-inhibition, inactivation, and recovery. 2. Trichloroethylene degradation experiments. Biotechnology and Bioengineering 1995;46(3):232-245. |
Author Self-Citation
Self-citations are journal article references to articles from that same author (i.e., the first author). Because higher author self-citation rates can inflate the number of citations, the author self-citation rate was calculated for the land/remediation papers. Of the 14,477 total cites, 767 are author self-cites—a 5.3% author self-citation rate. Garfield and Sher2 found that authors working in research-based disciplines tend to cite themselves on the average of 20% of the time. MacRoberts and MacRoberts3 claim that approximately 10% to 30% of all the citations listed fall into the category of author self-citation. Therefore, the 5.3% self-cite rate for the land/remediation papers is well below the range for author self-citation.
1 Thomson's Web of Science provides access to current and retrospective multidisciplinary information from approximately 8,500 of the most prestigious, high impact research journals in the world. Web of Science also provides cited reference searching.
2 Garfield E, Sher IH. New factors in the evaluation of scientific literature through citation indexing. American Documentation 1963;18(July):195-201.
3 MacRoberts MH, MacRoberts BR. Problems of citation analysis: a critical review. Journal of the American Society of Information Science 1989;40(5):342-349.