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Valfredo Azevedo Lemos

Valfredo Azevedo Lemos

D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Chemistry 48 15414 13898 128 122 134 6605

Valfredo Azevedo Lemos publications per year

The chart shows the history of publications by Valfredo Azevedo Lemos between 1997 and 2026, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Valfredo Azevedo Lemos published across 30 years, from 1997 to 2026, averaging 4.9 papers a year. Output peaked at 13 publications in 2020. 6 of the 147 publications appeared in the last two years.

No. of publications
5 10
Bar chart. Horizontal axis: year, 1997 to 2026. Vertical axis: number of publications, 0 to 13. Peak 13 publications in 2020. 1997: 1 publication 1998: 1 publication 1999: 1 publication 2000: 3 publications 2001: 3 publications 2002: 1 publication 2003: 4 publications 2004: 2 publications 2005: 5 publications 2006: 10 publications 2007: 9 publications 2008: 5 publications 2009: 4 publications 2010: 8 publications 2011: 5 publications 2012: 8 publications 2013: 4 publications 2014: 4 publications 2015: 7 publications 2016: 4 publications 2017: 4 publications 2018: 4 publications 2019: 6 publications 2020: 13 publications 2021: 7 publications 2022: 9 publications 2023: 4 publications 2024: 5 publications 2025: 5 publications 2026: 1 publication
1997 2026

147 publications in total across all disciplines

View publications per year as a table
Valfredo Azevedo Lemos: publications per year, 1997 to 2026
Year Publications
1997 1
1998 1
1999 1
2000 3
2001 3
2002 1
2003 4
2004 2
2005 5
2006 10
2007 9
2008 5
2009 4
2010 8
2011 5
2012 8
2013 4
2014 4
2015 7
2016 4
2017 4
2018 4
2019 6
2020 13
2021 7
2022 9
2023 4
2024 5
2025 5
2026 1
Total 147
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Valfredo Azevedo Lemos publication distribution in Chemistry in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Chemistry in 2026. The highlighted bar marks where Valfredo Azevedo Lemos sits on this spectrum.

No. of scientists
250 500 750 1,000 1,250
Bar chart with 63 bars. Horizontal axis: publications, 61–80 to 1,295+. Vertical axis: number of scientists, 0 to 1,350. Most scientists, 1,350, have 161–180 publications. The last bar groups every scientist with 1,295 publications or more. The highlighted bar, 121–140 publications, is where this scientist sits. 61–80 publications: 66 scientists 81–100 publications: 302 scientists 101–120 publications: 623 scientists 121–140 publications: 918 scientists 141–160 publications: 1,218 scientists 161–180 publications: 1,350 scientists 181–200 publications: 1,344 scientists 201–220 publications: 1,281 scientists 221–240 publications: 1,216 scientists 241–260 publications: 1,100 scientists 261–280 publications: 979 scientists 281–300 publications: 939 scientists 301–320 publications: 764 scientists 321–340 publications: 643 scientists 341–360 publications: 628 scientists 361–380 publications: 522 scientists 381–400 publications: 459 scientists 401–420 publications: 397 scientists 421–440 publications: 327 scientists 441–460 publications: 270 scientists 461–480 publications: 265 scientists 481–500 publications: 252 scientists 501–520 publications: 201 scientists 521–540 publications: 185 scientists 541–560 publications: 148 scientists 561–580 publications: 148 scientists 581–600 publications: 132 scientists 601–620 publications: 114 scientists 621–640 publications: 104 scientists 641–660 publications: 91 scientists 661–680 publications: 92 scientists 681–700 publications: 73 scientists 701–720 publications: 57 scientists 721–740 publications: 54 scientists 741–760 publications: 67 scientists 761–780 publications: 45 scientists 781–800 publications: 46 scientists 801–820 publications: 39 scientists 821–840 publications: 32 scientists 841–860 publications: 36 scientists 861–880 publications: 29 scientists 881–900 publications: 26 scientists 901–920 publications: 24 scientists 921–940 publications: 14 scientists 941–960 publications: 23 scientists 961–980 publications: 28 scientists 981–1,000 publications: 15 scientists 1,001–1,020 publications: 29 scientists 1,021–1,040 publications: 12 scientists 1,041–1,060 publications: 19 scientists 1,061–1,080 publications: 12 scientists 1,081–1,100 publications: 6 scientists 1,101–1,120 publications: 8 scientists 1,121–1,140 publications: 12 scientists 1,141–1,160 publications: 5 scientists 1,161–1,180 publications: 6 scientists 1,181–1,200 publications: 14 scientists 1,201–1,220 publications: 7 scientists 1,221–1,240 publications: 2 scientists 1,241–1,260 publications: 6 scientists 1,261–1,280 publications: 4 scientists 1,281–1,294 publications: 6 scientists 1,295+ publications: 100 scientists
61–80 publications 1,295+

This scientist: 134 publications — 9th percentile

9% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 1,295 publications or more.

View publications distribution as a table
Number of Chemistry scientists by publication count, Research.com 2026 ranking edition. Based on 17,934 ranked scientists.
Publications Scientists This scientist
61–80 66
81–100 302
101–120 623
121–140 918 134
141–160 1,218
161–180 1,350
181–200 1,344
201–220 1,281
221–240 1,216
241–260 1,100
261–280 979
281–300 939
301–320 764
321–340 643
341–360 628
361–380 522
381–400 459
401–420 397
421–440 327
441–460 270
461–480 265
481–500 252
501–520 201
521–540 185
541–560 148
561–580 148
581–600 132
601–620 114
621–640 104
641–660 91
661–680 92
681–700 73
701–720 57
721–740 54
741–760 67
761–780 45
781–800 46
801–820 39
821–840 32
841–860 36
861–880 29
881–900 26
901–920 24
921–940 14
941–960 23
961–980 28
981–1,000 15
1,001–1,020 29
1,021–1,040 12
1,041–1,060 19
1,061–1,080 12
1,081–1,100 6
1,101–1,120 8
1,121–1,140 12
1,141–1,160 5
1,161–1,180 6
1,181–1,200 14
1,201–1,220 7
1,221–1,240 2
1,241–1,260 6
1,261–1,280 4
1,281–1,294 6
1,295+ 100
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Valfredo Azevedo Lemos D-index placement in Chemistry in 2026

The chart shows the D-index (discipline H-index) distribution of Chemistry scientists ranked by Research.com in 2026. The highlighted bar marks where Valfredo Azevedo Lemos sits on this spectrum.

No. of scientists
250 500 750 1,000
Bar chart with 61 bars. Horizontal axis: D-Index, 40–41 to 159+. Vertical axis: number of scientists, 0 to 1,051. Most scientists, 1,051, have 56–57 D-Index. The last bar groups every scientist with 159 D-Index or more. The highlighted bar, 48–49 D-Index, is where this scientist sits. 40–41 D-Index: 289 scientists 42–43 D-Index: 612 scientists 44–45 D-Index: 808 scientists 46–47 D-Index: 776 scientists 48–49 D-Index: 835 scientists 50–51 D-Index: 861 scientists 52–53 D-Index: 872 scientists 54–55 D-Index: 933 scientists 56–57 D-Index: 1,051 scientists 58–59 D-Index: 930 scientists 60–61 D-Index: 882 scientists 62–63 D-Index: 834 scientists 64–65 D-Index: 731 scientists 66–67 D-Index: 775 scientists 68–69 D-Index: 683 scientists 70–71 D-Index: 646 scientists 72–73 D-Index: 561 scientists 74–75 D-Index: 501 scientists 76–77 D-Index: 437 scientists 78–79 D-Index: 388 scientists 80–81 D-Index: 354 scientists 82–83 D-Index: 292 scientists 84–85 D-Index: 275 scientists 86–87 D-Index: 254 scientists 88–89 D-Index: 235 scientists 90–91 D-Index: 185 scientists 92–93 D-Index: 192 scientists 94–95 D-Index: 155 scientists 96–97 D-Index: 163 scientists 98–99 D-Index: 125 scientists 100–101 D-Index: 105 scientists 102–103 D-Index: 105 scientists 104–105 D-Index: 112 scientists 106–107 D-Index: 88 scientists 108–109 D-Index: 68 scientists 110–111 D-Index: 69 scientists 112–113 D-Index: 65 scientists 114–115 D-Index: 79 scientists 116–117 D-Index: 61 scientists 118–119 D-Index: 44 scientists 120–121 D-Index: 37 scientists 122–123 D-Index: 40 scientists 124–125 D-Index: 33 scientists 126–127 D-Index: 26 scientists 128–129 D-Index: 34 scientists 130–131 D-Index: 35 scientists 132–133 D-Index: 25 scientists 134–135 D-Index: 27 scientists 136–137 D-Index: 17 scientists 138–139 D-Index: 16 scientists 140–141 D-Index: 20 scientists 142–143 D-Index: 20 scientists 144–145 D-Index: 15 scientists 146–147 D-Index: 9 scientists 148–149 D-Index: 9 scientists 150–151 D-Index: 16 scientists 152–153 D-Index: 11 scientists 154–155 D-Index: 9 scientists 156–157 D-Index: 3 scientists 158 D-Index: 3 scientists 159+ D-Index: 98 scientists
40–41 D-Index 159+

This scientist: 48 D-Index — 16th percentile

16% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 159 D-Index or more.

View D-Index distribution as a table
Number of Chemistry scientists by D-index, Research.com 2026 ranking edition. Based on 17,934 ranked scientists.
D-Index Scientists This scientist
40–41 289
42–43 612
44–45 808
46–47 776
48–49 835 48
50–51 861
52–53 872
54–55 933
56–57 1,051
58–59 930
60–61 882
62–63 834
64–65 731
66–67 775
68–69 683
70–71 646
72–73 561
74–75 501
76–77 437
78–79 388
80–81 354
82–83 292
84–85 275
86–87 254
88–89 235
90–91 185
92–93 192
94–95 155
96–97 163
98–99 125
100–101 105
102–103 105
104–105 112
106–107 88
108–109 68
110–111 69
112–113 65
114–115 79
116–117 61
118–119 44
120–121 37
122–123 40
124–125 33
126–127 26
128–129 34
130–131 35
132–133 25
134–135 27
136–137 17
138–139 16
140–141 20
142–143 20
144–145 15
146–147 9
148–149 9
150–151 16
152–153 11
154–155 9
156–157 3
158 3
159+ 98
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Overview

Valfredo Azevedo Lemos is affiliated with Southwest Bahia State University in Brazil. Their research primarily focuses on Chemistry, with a significant body of work in the subfields of Analytical Chemistry, Electrochemistry, Biomedical Engineering, Health, Toxicology and Mutagenesis, and Bioengineering.

Their scientific contributions cover a range of main topics, including:

  • Analytical chemistry methods development
  • Electrochemical Analysis and Applications
  • Mercury impact and mitigation studies
  • Analytical Chemistry and Sensors
  • Biosensors and Analytical Detection
  • Heavy metals in environment
  • Radioactive element chemistry and processing

Valfredo Azevedo Lemos has an established publication record in various scientific journals. Their recent papers include:

  • In-syringe dispersive liquid-liquid microextraction, 2021, Talanta
  • Deep eutectic solvents in liquid-phase microextraction: Contribution to green chemistry, 2021, TrAC Trends in Analytical Chemistry
  • Multivariate optimization of a dispersive liquid-liquid microextraction method for determination of copper and manganese in coconut water by FAAS, 2021, Food Chemistry
  • Automation of continuous flow analysis systems - a review, 2020, Microchemical Journal
  • A novel direct-immersion single-drop microextraction combined with digital colorimetry applied to the determination of vanadium in water, 2020, Talanta

The frequent coauthors who have collaborated with Valfredo Azevedo Lemos include:

  • Luana Bastos Santos
  • Jeferson Alves Barreto
  • Marcos Almeida Bezerra
  • Sérgio L.C. Ferreira
  • Cléber Galvão Novaes

Throughout their career, Valfredo Azevedo Lemos has published multiple articles in several prominent journals, including:

  • Microchemical Journal
  • TrAC Trends in Analytical Chemistry
  • Talanta
  • Food Chemistry
  • Water Air & Soil Pollution

Best Publications

  • Separation and preconcentration procedures for the determination of lead using spectrometric techniques: a review.

    Maria das Graças A. Korn;Jailson B. de Andrade;Djane S. de Jesus;Djane S. de Jesus;Valfredo A. Lemos

  • New Materials for Solid‐Phase Extraction of Trace Elements

    Valfredo Azevedo Lemos;Leonardo Sena Gomes Teixeira;Marcos de Almeida Bezerra;Antonio Celso Spínola Costa

  • Amberlite XAD-2 functionalized with 2-aminothiophenol as a new sorbent for on-line preconcentration of cadmium and copper.

    Valfredo Azevedo Lemos;Patrícia Xavier Baliza

  • Uranium determination using atomic spectrometric techniques: An overview

    Juracir S. Santos;Leonardo S.G. Teixeira;Walter N.L. dos Santos;Valfredo A. Lemos;Valfredo A. Lemos

  • Application of polyurethane foam as a sorbent for trace metal pre-concentration — A review

    V.A. Lemos;M.S. Santos;E.S. Santos;M.J.S. Santos

  • Multi-element determination of Cu, Fe, Ni and Zn content in vegetable oils samples by high-resolution continuum source atomic absorption spectrometry and microemulsion sample preparation.

    Luana S. Nunes;José T.P. Barbosa;Andréa P. Fernandes;Valfredo A. Lemos;Valfredo A. Lemos

  • Cloud point extraction for Co and Ni determination in water samples by flame atomic absorption spectrometry

    Valfredo Azevedo Lemos;Robson Silva da França;Bruno Oliveira Moreira

  • Preconcentration system for cadmium and lead determination in environmental samples using polyurethane foam/Me-BTANC

    Ednilton Moreira Gama;Adriana da Silva Lima;Valfredo Azevedo Lemos

  • Multivariate optimization techniques in analytical chemistry - an overview

    Sergio L.C. Ferreira;Valfredo A. Lemos;Vanessa S. de Carvalho;Erik G.P. da Silva

  • Deep eutectic solvents in liquid-phase microextraction: contribution to green chemistry

    Luana Bastos Santos;Luana Bastos Santos;Rosivan dos Santos de Assis;Rosivan dos Santos de Assis;Jeferson Alves Barreto;Marcos Almeida Bezerra;Marcos Almeida Bezerra

  • Review of procedures involving separation and preconcentration for the determination of cadmium using spectrometric techniques.

    Sérgio L C Ferreira;Jailson B de Andrade;Maria das Graças A Korn;Madson de G Pereira

  • On-line preconcentration system for nickel determination in food samples by flame atomic absorption spectrometry

    Sergio Luis Costa Ferreira;Walter Nei Lopes dos Santos;Valfredo Azevedo Lemos;Valfredo Azevedo Lemos

  • An on-line continuous flow system for copper enrichment and determination by flame atomic absorption spectroscopy

    Sérgio L.C Ferreira;Valfredo A Lemos;Barbara C Moreira;A.C.Spinola Costa

  • Copper determination in natural water samples by using FAAS after preconcentration onto amberlite XAD-2 loaded with calmagite

    Sérgio L.C Ferreira;Janeide R Ferreira;Alailson F Dantas;Valfredo A Lemos

  • A procedure for determination of cobalt in water samples after dispersive liquid–liquid microextraction

    Patrícia Xavier Baliza;Patrícia Xavier Baliza;Leonardo Sena Gomes Teixeira;Valfredo Azevedo Lemos

  • An on-line system for preconcentration and determination of lead in wine samples by FAAS

    Valfredo Azevedo Lemos;Miguel de la Guardia;Sergio Luis Costa Ferreira

  • Analytical strategies of sample preparation for the determination of mercury in food matrices — A review

    Sergio L.C. Ferreira;Valfredo A. Lemos;Laiana O.B. Silva;Antonio F.S. Queiroz

  • On-line preconcentration system for lead determination in seafood samples by flame atomic absorption spectrometry using polyurethane foam loaded with 2-(2-benzothiazolylazo)-2-p-cresol

    Valfredo Azevedo Lemos;Valfredo Azevedo Lemos;Sergio Luis Costa Ferreira

  • Synthesis of amberlite XAD-2-PC resin for preconcentration and determination of trace elements in food samples by flame atomic absorption spectrometry

    Valfredo Azevedo Lemos;Douglas Gonçalves da Silva;Anaildes Lago de Carvalho;Débora de Andrade Santana

  • Thiazolylazo dyes and their application in analytical methods

    Valfredo Azevedo Lemos;Elenir Souza Santos;Moacy Selis Santos;Regina Terumi Yamaki

Frequent Co-Authors

Sergio Luis Costa Ferreira
Sergio Luis Costa Ferreira Federal University of Bahia
Marco Aurélio Zezzi Arruda
Marco Aurélio Zezzi Arruda State University of Campinas
Manuel Miró
Manuel Miró University of the Balearic Islands
Miguel de la Guardia
Miguel de la Guardia University of Valencia
Mustafa Soylak
Mustafa Soylak Erciyes University
Latif Elci
Latif Elci Pamukkale University
Adilson J. Curtius
Adilson J. Curtius Universidade Federal de Santa Catarina

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