Network


Latest external collaboration on country level. Dive into details by clicking on the dots.

Hotspot


Dive into the research topics where Giovana de Fátima Lima is active.

Publication


Featured researches published by Giovana de Fátima Lima.


Talanta | 2012

Novel on-line sequential preconcentration system of Cr(III) and Cr(VI) hyphenated with flame atomic absorption spectrometry exploiting sorbents based on chemically modified silica.

César Ricardo Teixeira Tarley; Giovana de Fátima Lima; Danielle R. Nascimento; Alan R.S. Assis; Emerson Schwingel Ribeiro; Kristiany Moreira Diniz; Marcos de Almeida Bezerra; Mariana Gava Segatelli

In the present study, a flow injection system using dual mini-columns, SiO(2)/Al(2)O(3)/TiO(2) and silica gel functionalized with [3-(2-aminoethylamino)propyl] trimethoxysilane (SiO(2)/AAPTMS) for the sequential preconcentration of Cr(III) and Cr(VI), respectively, from water samples with FAAS detection was proposed. A two-level full factorial design (2(4)) and desirability function were employed for the optimization of variables related to the system performance. The detection limits of 0.66 and 0.27 μg L(-1) for Cr(III) and Cr(IV), respectively, were obtained under the optimized preconcentration conditions (flow rate of 7.0 mL min(-1)), pH 5.0, buffer concentration (acetate buffer) of 0.01 mol L(-1), and eluent (2.5 mol L(-1) HCl) flow rate of 5.0 mL min(-1). The other parameters including preconcentration factor (PF), consumptive index (CI), and concentration efficiency (CE) were found to be 17.62/32.98, 1.13/0.6 mL, and 6.2/11.54 min(-1) for Cr(III)/Cr(VI), respectively. The developed method was applied to the Cr(III) and Cr(VI) determination in water samples [tap, lake and mineral water, artificial saliva and parenteral solutions (physiological serum, water for injection, and glucose physiological solution)]. The method accuracy was checked by the analysis of standard reference materials (trace elements in water).


Journal of the Brazilian Chemical Society | 2010

Silica-alumina-niobia (SiO2/Al2O3/Nb2O5) matrix obtained by the sol-gel processing method: new material for online extraction of zinc ions

César Ricardo Teixeira Tarley; Thiago Carvalho de Ávila; Mariana Gava Segatelli; Giovana de Fátima Lima; Gabrielly dos S. Peregrino; Carla W. Scheeren; Silvio L.P. Dias; Emerson Schwingel Ribeiro

In the present work, a new material, SiO2/Al2O3/Nb2O5 (designated as SiAlNb), was evaluated as an adsorbent in a flow injection spectrophotometric method for online preconcentration and determination of trace amounts of Zn2+ ions. The preconcentration method is based on Zn2+ adsorption onto the surface of SiAlNb in alkaline medium (pH 9.0). The elution step is carried out using HNO3 solution, followed by reaction of the Zn2+ ions with 1-(2-piridylazo)-2-naphtol (pan) in ammoniacal buffer solution (pH 9.3) containing Tween-80. The [Zn(pan)2] complex formed is determined at 560 nm. The method presented a linear range between 7.6 and 180.0 µg L-1 (r = 0.9992) and limits of detection and quantification of 2.3 and 7.6 µg L-1, respectively. According to the Langmuir linear model, the maximum adsorption capacity was found to be 7.0 mg of Zn2+ g-1 of SiAlNb. The proposed method was successfully applied to the Zn2+ determination in water samples (lake, mineral, tap) and certified reference material (TORT-2 Lobster Hepatopancreas).


Environmental Technology | 2012

Evaluation of vermicompost as a raw natural adsorbent for adsorption of pesticide methylparathion

Camila Bitencourt Mendes; Giovana de Fátima Lima; Vanessa N. Alves; Nívia M.M. Coelho; Douglas Cardoso Dragunski; César Ricardo Teixeira Tarley

The assessment of vermicompost (VC) as a low-cost and alternative adsorbent for the removal of the pesticide methylparathion (MP) from an aqueous medium has been investigated by batch and column experiments. Parameters related to MP adsorption, i.e. equilibrium time (61.5 min) and adsorption pH (6.8) were optimized by using Doehlert design. The initial and final MP concentrations after adsorption assays were determined by square-wave adsorptive cathodic stripping voltammetry using an electrode composed of a multiwalled carbon nanotube dispersed in mineral oil. Batch adsorption experimental data were fitted to the Langmuir and Freundlich isotherm adsorptions, and a very good fit to the Langmuir linear model, giving a maximum adsorption capacity (MAC) of 0.17 mg g−1. This result was very similar to that obtained with the column experiments. In order to evaluate the MP desorption from column packed VC, 100.0 ml of nitric acid solution (pH 3.0) has been percolated through material. No leaching of MP was observed, thus confirming the strong interaction between MP and VC. The satisfactory MAC obtained and low cost makes the VC a reliable natural material for the removal of MP from aqueous effluents.


Química Nova | 2014

Synthesis, characterization and application of ion imprinted poly(vinylimidazole) for zinc ion extraction/preconcentration with faas determination

Queila O. dos Santos; Marcos de Almeida Bezerra; Giovana de Fátima Lima; Kristiany Moreira Diniz; Mariana Gava Segatelli; Talitha Oliveira Germiniano; Vivian da Silva Santos; César Ricardo Teixeira Tarley

In this paper, we describe the synthesis of an ion imprinted polymer (IIP) by homogeneous polymerization and its use in solid-phase to extract and preconcentrate zinc ions. Under optimal conditions (pH 5.0, preconcentration flow rate of 12.0 mL min-1, and eluted with 1.0 mol L-1 HNO3) this procedure allows the determination of zinc with an enrichment factor of 10.2, and with limits of detection and quantification of 1.5 and 5.0 µg L-1, respectively. The accuracy of our results was confirmed by analysis of tap water and certified reference materials: NIST 1570a (Spinach leaves) and NIST 1515 (Apple leaves).


International Journal of Environmental Analytical Chemistry | 2012

Highly sensitive ion preconcentration method based on flow sorbent extraction using multiwall carbon nanotubes

Ayla Campos do Lago; Giovana de Fátima Lima; Mariana Gava Segatelli; César Ricardo Teixeira Tarley

In this work a solid phase on-line uranium ion preconcentration system coupled with spectrophotometry has been developed. The method is based on uranyl ion preconcentration at pH 3.75 onto multiwall carbon nanotubes treated with HNO3. After preconcentration, the uranyl ions are eluted with 0.32 mol L−1HCl followed by reaction with 3,6-bis[(2-arsonophenyl)-azo]-4,5-dihydroxy-2,7-naphthalendisulfonic acid 0.08%[w/v] (Arsenazo III), which had maximum monitored absorbance of 650 nm. Effects of the pertinent experimental parameters on the system were investigated by means of 26−2 fractional factorial design, while optimization was carried out using the Doehlert matrix. Under optimized conditions, detection and quantification limits were found to be 0.21 and 0.7 µg L−1, respectively. The analytical curve ranged from 5 to 150 µg L−1 (r = 0.998), while the relative standard deviations (RSD) were 3.27 and 2.56% for the respective uranium concentrations of 10 and 100 µg L−1 (n = 10). The features obtained for the on-line preconcentration system were: preconcentration factor of 228, concentration efficiency of 57 min−1, consumption index of 0.13 mL and sample throughput of 15 h−1. In order to assess the accuracy of the proposed method, addition and recovery studies were carried out on spring water samples from different sources and synthetic seawater with satisfactory results ranging from 94.85 up to 103.65%.


Archive | 2011

Evaluation of Histidine Functionalized Multiwalled Carbon Nanotubes for Improvement in the Sensitivity of Cadmium Ions Determination in Flow Analysis

Giovana de Fátima Lima; Fernanda Midori de Oliveira; Maikow Ohara; Mariana Gava Segatelli; Tarley

The determination of heavy metal ions in environmental, clinical and food samples has been a common concern for several researchers and in special case of aquatic environment, there has been a more stringent regulation standards pertaining to the discharge of heavy metals. Some efforts have been carried out to develop many treatment processes to reduce the disposal of heavy metal ions mainly in water bodies. The different treatment processes include precipitation, membrane filtration, ion exchange and adsorption (Tokalioglu et al. 2009), however, the levels of heavy metals disposal into water bodies are still rising, mainly in aqueous effluents discharged into aquatic bodies (Mello et al. 2005). As example, lead is considered as the major environmental pollutant and has become the most widely scattered toxic heavy metal in the world as a result of anthropogenic action. It is very well known that lead enters the environment through several industrial activities, such as industrial ammunition, paper board mill, battery manufacturing and coal burning and pigments (Zhan & Zhao, 2003). Lead can cause several effects on central nervous system, blood pressure, kidneys and reproductive system (Needleman, 2004). Similarly to lead, cadmium is also considered as toxic for animals and humans, and it is classified by the International Agency for Research on Cancer as a human carcinogen (IARC, 1993). The National Council for the Environment in Brazil (CONAMA, 2005) established 0.2 mg L-1 as the maximum level of cadmium for effluent discharge in aquatic bodies, while 5.0 and 3.0 μg L-1 are the maximum contaminant levels in potable water allowed by EPA(EPA, 2003) and ANVISA (ANVISA, 2004), respectively. Even at low concentration levels (≤ g L-1), there is bioaccumulation of heavy metals in aquatic organisms, so there is a growing need for their monitoring in different types of water samples. In addition, the heavy metal ions monitoring can provide both important aspects in water quality and controlling the industrial processes (Martinotti et al. 1995). Thus, the development of analytical methods based on preconcentration systems has commonly been the aim of choice for the determination of trace metals in water and


Environanotechnology | 2010

CHAPTER 9 – Spectrophotometric Flow-Injection System Using Multiwalled Carbon Nanotubes as Solid Preconcentrator for Copper Monitoring in Water Samples

Giovana de Fátima Lima; Polyana Maria de Jesus Souza; Mariana Gava Segatelli; Pedro Orival Luccas; César Ricardo Teixeira Tarley

Publisher Summary This chapter deals with carbon and carbon nanotubes. Copper is one of a relatively small group of metallic elements that are essential for human, plant, and animal enzymes. Copper ions are introduced into human and animal bodies by food, water, air, etc. Copper enters the marine environment primarily from riverine transport and aerosols. Anthropogenic and geothermal sources can also be included. Depending on its concentration, copper may be a hazard to aquatic organisms. Nanomaterials based on only saturated carbon atoms, also known as carbon nanotubes, in both single-walled carbon nanotubes and multiwalled carbon nanotubes (MWCNTs), are becoming potential sorbents for metal ions due to their unique electronic, mechanical, and chemical properties. The aim of this work is to develop a reliable flow injection preconcentration system coupled to UV–V is molecular spectrophotometry for copper determination using MWCNT as sorbent.This system is the first one that demonstrates the powerful application of MWCNT in the field of solid-phase preconcentration using spectrophotometric determination, a technique naturally less selective than atomic absorption spectrometry.


Mikrochimica Acta | 2012

Flow injection on-line minicolumn preconcentration and determination of trace copper ions using an alumina/titanium oxide grafted silica matrix and FAAS

Giovana de Fátima Lima; Maikow Ohara; Débora Nobile Clausen; Danielle R. Nascimento; Emerson Schwingel Ribeiro; Mariana Gava Segatelli; Marcos de Almeida Bezerra; César Ricardo Teixeira Tarley


Water Air and Soil Pollution | 2011

Preconcentration/Cleanup Studies of Tin from Environmental Water Samples by Oxidized Multiwall Carbon Nanotubes Packed Column and its Determination by ETAAS

Heloísa Helena Vilela Costa; Giovana de Fátima Lima; Letícia Ramos Nacano; César Ricardo Teixeira Tarley


Microchemical Journal | 2013

Study of silica-manganese oxide hybrid material as a new solid phase for on-line continuous flow enrichment of Cd(II) ions coupled to flame atomic absorption spectrometry

Giovana de Fátima Lima; Vitor S. Ferreira; Naiara Vieira Godoy; Rafael Franklin Medeiros; Francisco M. S. Garrido; Emerson Schwingel Ribeiro; Shirley Nakagaki; Mariana Gava Segatelli; Marcos de Almeida Bezerra; César Ricardo Teixeira Tarley

Collaboration


Dive into the Giovana de Fátima Lima's collaboration.

Top Co-Authors

Avatar
Top Co-Authors

Avatar

Mariana Gava Segatelli

Universidade Estadual de Londrina

View shared research outputs
Top Co-Authors

Avatar

Emerson Schwingel Ribeiro

Federal University of Rio de Janeiro

View shared research outputs
Top Co-Authors

Avatar
Top Co-Authors

Avatar

Pedro Orival Luccas

Federal University of São Carlos

View shared research outputs
Top Co-Authors

Avatar

Ariadne M. Brondi

Universidade Federal de Alfenas

View shared research outputs
Top Co-Authors

Avatar

Célio Wisniewski

Universidade Federal de Alfenas

View shared research outputs
Top Co-Authors

Avatar

Danielle R. Nascimento

Federal University of Rio de Janeiro

View shared research outputs
Top Co-Authors

Avatar
Top Co-Authors

Avatar

Débora Nobile Clausen

Universidade Estadual de Londrina

View shared research outputs
Researchain Logo
Decentralizing Knowledge