World's Best Scientists 2026 revealed!
Valfredo Azevedo Lemos

Valfredo Azevedo Lemos

D-Index & Metrics

Chemistry

D-Index
48
Citations
6605
World Ranking
15414
National Ranking
128

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.

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 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.

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.

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 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.

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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