Determination Of Lead And Copper
Mostrando 1-12 de 29 artigos, teses e dissertações.
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1. DETERMINATION OF TOTAL AND BIOACCESSIBLE ELEMENTS IN TEMPORARY ADHESIVE TATTOOS USED BY CHILDREN AND ADULTS
The presence of bioaccessible potentially-toxic elements in five different brands of temporary tattoos (packaged with bubble gums) aimed at children and three product brands used by young and adult audiences were analyzed in accordance with the Brazilian Organization of Technical Standards (ABNT) and International Organization for Standardization (ISO) for t
Química Nova. Publicado em: 2022
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2. Electroanalytical Method for Determination of Trace Metals in Struvite Using Electrochemically Treated Screen-Printed Gold Electrodes
We present an electroanalytical method using square-wave anodic stripping voltammetry on electrochemically-treated screen-printed gold electrodes to the simultaneous determination of lead(II), copper(II) and mercury(II) in struvite (natural fertilizer produced from urine). Electrochemical treatment via cyclic voltammetry of the working electrodes increased s
J. Braz. Chem. Soc.. Publicado em: 2020-09
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3. Nonanoic Acid-Coated Magnetite Nanoparticles for Separation and Preconcentration of Lead and Copper in Tobacco Samples prior to Flame Atomic Absorption Spectrometry Determination
A new method using nonanoic acid-coated magnetic Fe3O4 nanoparticles as adsorbent has been developed for the single-step extraction and preconcentration of lead and copper in tobacco samples. Transmission electron microscopy and X-ray diffraction spectrometry were used to characterize the adsorbent. The experimental parameters affecting extraction efficiency
J. Braz. Chem. Soc.. Publicado em: 2018-01
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4. ESTUDO DO EFEITO DE MATRIZ NA DETERMINAÇÃO DE METAIS EM ÓLEOS BÁSICOS RERREFINADOS POR FLUORESCÊNCIA DE RAIOS X POR ENERGIA DISPERSIVA
In this article, the results of the study of the matrix effect in the determination of metals calcium, chromium, iron, nickel, copper, zinc, molybdenum, cadmium, barium and lead in base oil using Energy Dispersive X-Ray Fluorescence (EDX) are presented. Sensitivities obtained for each calibration curve were evaluated where calcium, chromium, copper, cadmi
Quím. Nova. Publicado em: 2015-06
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5. Sodium dodecyl sulfate coated γ-alumina support modified by a new Schiff base for solid phase extraction and flame-AAS determination of lead and copper ions
A simple and fast approach for solid phase extraction is herein described, and used to determine trace amounts of Pb2+ and Cu2+ metal ions. The solid phase support is sodium dodecyl sulfate (SDS)-coated γ-alumina modified with bis(2-hydroxy acetophenone)-1,6-hexanediimine (BHAH) ligand. The adsorbed ions were stripped from the solid phase by 6 mL of 4 M nit
Quím. Nova. Publicado em: 2013
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6. An alternative method for the simultaneous determination of copper and lead for quality control of sugar cane spirit using a nanotube-based sensor
Um método eletroanalítico foi desenvolvido para determinação simultânea de íons cobre e chumbo em cachaça empregando eletrodo de pasta de carbono modificado com ácido ascórbico e nanotubos de carbono (CPE-AaCNT). A técnica de voltametria de onda quadrada (SWV) com redissolução anódica foi empregada e otimizada com relação aos seguintes parâme
J. Braz. Chem. Soc.. Publicado em: 30/08/2012
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7. Sequential voltammetric determination of chromium, thallium, cadmium, lead, copper and antimony in saline hemodialysis concentrates using electrolyte pH gradient
The sequential voltammetric determination of chromium, thallium, cadmium, lead, copper and antimony in dialysate concentrates (DCs), is presented herein. Chromium was quantified by adsorptive cathodic stripping voltammetry and thallium, cadmium, lead, copper and antimony were assayed by anodic stripping voltammetry. The novel method developed to test these s
Journal of the Brazilian Chemical Society. Publicado em: 2011-05
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8. Determination of copper, iron, lead and zinc in gasoline by sequential multi-element flame atomic absorption spectrometry after solid phase extraction
Desenvolveu-se um procedimento para determinação de cobre, ferro, chumbo e zinco em amostras de gasolina. O procedimento foi baseado na pré-concentração dos metais empregando uma resina modificada com o ácido 3,4-dihidroxibenzóico (XAD-DHB), seguida da dessorção com solução ácida. Os analitos no eluato foram determinados por espectrometria de abs
Journal of the Brazilian Chemical Society. Publicado em: 2011-03
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9. AVALIAÇÃO VOLTAMÉTRICA DOS ÍONS METÁLICOS (COBRE, CÁDMIO E CHUMBO) EM AMOSTRAS DE COMBUSTÍVEIS PREVIAMENTE DIGERIDAS EM MICROONDAS USANDO ELETRODO QUIMICAMENTE MODIFICADO POR SAIS TETRAZÓLIOS / EVALUATION OF METAL IONS VOLTAMMETRY(COPPER, CADMIUM AND LEAD) IN SAMPLES OF FUELS PREVIOUSLY DIGESTED IN USING MICROWAVE ELECTRODE CHEMICALLY MODIFIED BY SALTS TETRAZOLIUM.
This paper describes an analytical procedure for determination of trace metals copper, cadmium and lead in fuel samples, using Basal Plane Pyrolytic Graphite Modified Electrode (BPPGME) by tetrazolium salts: ([3,3 - (3-3 -dimethoxy-4, bifenililen 4 -bis [2 - (4-nitrophenyl)-5-phenyl-2H-tetrazolium (NBT) Cl 3 - (4,5 - dimetitiazol-2il) -2,5-diphenyl-2H-Tetraz
Publicado em: 2010
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10. SIMULTÂNEA DE METAIS EM BIODIESEL, POR VOLTAMETRIA DE REDISSOLUÇÃO ANÓDICA USANDO ELETRODO DE FILME DE MERCÚRIO EM MEIO ALCÓOLICO / SIMULTANEOUS METAL IN BIODIESEL BY VOLTAMMETRY ANODIC STRIPPING USING MERCURY FILM ELECTRODE IN ALCOHOLIC MEDIUM
Diferential pulse and square wave anodic stripping voltammetry at the mercury film electrode, prepared in the ex-situ and in-situ modes, showed an adequate analytical performance and were employed for the development of a procedure for analysis of Biodiesel. Samples were simply diluted into a methanol solution to a final concentration of 0.33 mol L-1 (v/v) a
Publicado em: 2010
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11. DETERMINAÇÃO SEQUENCIAL DE CROMO, TÁLIO, CÁDMIO, CHUMBO, COBRE E ANTIMÔNIO EM CONCENTRADO POLIELETROLÍTICO PARA HEMODIÁLISE POR VOLTAMETRIA DE REDISSOLUÇÃO ATRAVÉS DE UM GRADIENTE DE pH / SEQUENTIAL DETERMINATION OF CHROMIUM, THALLIUM, CADMIUM, LEAD, COPPER AND ANTIMONY IN SALINE HEMODIALYSIS CONCENTRATES BY STRIPPING VOLTAMMETRY USING ELECTROLYTE pH GRADIENT
A Determinação sequencial de cromo, tálio, cádmio, chumbo e cobre e antimônio em concentrado polieletrolítico para hemodiálise (CPHD) é descrita. Estes concentrados contêm uma concentração extremamente alta de íons cloreto (cerca de 3,8 mol L-1), o que torna difícil a análise direta por muitas técnicas analíticas. As condições experimentais
Publicado em: 2010
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12. Funcionalization of mesoporous silica with 2-bezothiazolethiol and 3-mercaptopropyltrimetoxysilane for electronalytical application / Funcionalização de sílicas mesoporosas com benzotiazol-2-tiol e 3-mercaptopropiltrimetoxisilano para aplicações em eletroanalítica
Mesoporous silicas were functionalised by immobilisation of organic substances covalently bonded to the silanol groups on the silica surface. SBA-15 nanostructured silica was functionalised by post-synthesis with 2-benzothiazolethiol and silica films modified with 3-mercaptopropyltrimethoxysilane were obtained by direct functionalisation. The characterizatio
Publicado em: 2009