A multicommuted flow system for the determination of copper, chromium, iron and lead in lubricating oils with detection by flame AAS*1

Reis, Boaventura F.; Knochen, Moisés; Pignalosa, Gustavo; Cabrera, Noel; Giglio, Javier

doi:10.1016/j.talanta.2004.03.070

Cited by 60 publications

(33 citation statements)

References 11 publications

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“…Atomic Absorption Spectrometry (AAS) was applied to quantify the concentration of chromium from the cell free supernatant of samples collected from detoxification and degradation of leather dust assay [17,25,26]. Samples were prepared as a 1 in 10 dilution in 0.2 M Nitric acid to ensure detection within the limits of the AAS equipment.…”

Section: Quantification Of Chromium Concentration In Supernatantmentioning

confidence: 99%

Biosurfactant Production and Biodegradation of Leather Dust from Tannery

Greenwell¹,

Sarker²,

Rahman³

2016

TOBIOTJ

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Background:The leather industry contributes vast amounts of pollution damaging to aquatic and terrestrial environments. Leather dust is a chromium-contaminated waste produced from the shaving and buffering processes involved in leather tanning. Microorganisms have been investigated for their usefulness in bioremediation and recycling of waste materials. Solid leather waste is the current focus of material to be remediated in this study. Objective:The present work focuses on the development of a process to degrade the leather dust protein with the aim of removing the chromium bound within the protein. As part of the study, detecting the presence of biosurfactant production was performed to fuel further interest in value-added by-products of the process. Method:Bacillus subtilis SA-6 was used to treat the leather dust over a 10 day shake flask study. Daily samples were taken and analysed for chromium content by Atomic Absorption Spectrometry. The surface tension of the shake flask cultures was also investigated to detect for any valuable by-products such as biosurfactants for future prospects of developing an economically viable process. Results:Chromium concentration demonstrated an exponential increase between 0-120 h in shake flask experiments. In the presence of B. subtilis SA-6 chromium concentration in cell free supernatant increased from 0.13±0.09 mg/L to 190.81±20.18 mg/L compared to when B. subtilis SA-6 was absent. Surface tension decreased during fermentation from 53.23±0.92 mN/m to 30.13±0.15 mN/m in 24 h. Conclusion:This study demonstrates a waste management process, which detoxifies solid tannery waste to reduce environmental pollution, whilst yielding value-added products (such as biosurfactant) to provide an economically viable bioprocess with potential for large-scale development.

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Section: Quantification Of Chromium Concentration In Supernatantmentioning

confidence: 99%

Biosurfactant Production and Biodegradation of Leather Dust from Tannery

Greenwell¹,

Sarker²,

Rahman³

2016

TOBIOTJ

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“…Uma opção seria uma diluição prévia em solvente orgânico para posterior análise, 15,17,19,24 porém como o óleo analisado contém metais provenientes do desgaste físico das peças automotivas e esses não dissolvem em solventes orgânicos, fez-se necessária uma etapa de mineralização das amostras.…”

Section: Análise De Metais Em óLeos Lubrificantesunclassified

“…[12][13][14][15] A determinação de certos metais em óleos lubrificantes usados é uma prática usual na manutenção das máquinas 16 e vem sendo implementada como uma parte do programa de manutenção preditiva ou proativa. Na manutenção preditiva, as propriedades físico-químicas do óleo são estudadas para determinar o tempo apropriado para substituí-lo 17,18 e o desgaste do motor é monitorado através dos teores de metais no óleo. Dessa forma, a determinação de metais de desgaste em óleos lubrificantes usados é muito útil para prevenir componentes de falhas do motor, controlar a qualidade do motor e identificar algumas adulterações específicas.…”

Section: Introductionunclassified

Determinação de metais em óleos lubrificantes, provenientes de motores de ônibus urbano, utilizando a FAAS

Coelho¹,

Neto²,

Moura³

et al. 2010

Quím. Nova

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Recebido em 11/12/09; aceito em 12/6/10; publicado na web em 22/9/10 DETERMINATION OF METALS IN LUBRICATING OILS, FROM PUBLIC TRANSPORTATION, USING THE FAAS. This work proposed a procedure to examine ashes produced in burning lubricating oils used in public transportation, in Teresina PI. Sulphanilic acid was added to the oil samples, which were burned at 550 °C for three hours and 650 °C for two hours. The ash solutions were analyzed by FAAS and there were significant differences in the metal contents of the waste oil produced from normal car service. The quantification limits in µg g -1 were 5.9 (Fe), 4.4 (Pb), 1.7 (Ni), 2.1 (Cu), and 1.2 (Zn). The results showed positive accuracy and precision with recoveries between 88 and 108%, and RSD lower than 10%.Keywords: used lubricating oil; metals; flame atomic absorption spectrometry. INTRODUÇÃOOs óleos básicos representam o principal componente da grande maioria dos lubrificantes, perfazendo cerca de 80% da composição. 1Os óleos básicos de origem mineral são ainda os mais empregados em lubrificação, sendo obtidos do petróleo, portanto, suas propriedades se relacionam à natureza do óleo cru que lhes deu origem e ao processo de refinação empregado.2,3 Geralmente consistem de uma mistura de moléculas contendo de 18 a 40 átomos de carbono classificados em parafínicos, aromáticos e naftênicos (cicloparafínicos). Estes óleos básicos além de carbono e hidrogênio podem conter ainda uma pequena porcentagem de compostos contendo heteroátomos como enxofre, nitrogênio ou oxigênio, substituídos em várias estruturas hidrocarbônicas. 4 As principais funções dos lubrificantes são: redução do atrito entre superfícies, prevenção de corrosão e ferrugem, resfriamento pela remoção do calor produzido pelo atrito das peças e limpeza do motor, entre outras. [5][6][7][8] O processo de lubrificação hidrodinâmica com óleo consiste em facilitar o movimento relativo entre superfícies sob carga de trabalho usando um filme de óleo lubrificante entre as mesmas. Uma boa lubrificação depende de algumas propriedades, tais como, tolerância ao aquecimento, condutividade térmica, relação entre temperatura, pressão e viscosidade, solvência, dispersância, detergência, antidesgaste, anticorrosão, propriedades de fricção e capacidade antioxidante, que são importantes para o sucesso da lubrificação. Muitas dessas propriedades são controladas pelos aditivos químicos designados para tais finalidades. 4O aperfeiçoamento das máquinas que operam sob condições severas teve como consequência a necessidade da melhoria das qualidades naturais dos lubrificantes denominados óleos minerais puros.8 Assim, aditivos são incorporados aos óleos lubrificantes para melhorar sua cor, viscosidade, ponto de fluidez, capacidade antidesgaste, propriedades anticorrosivas e antioxidativas.9 Um típico óleo de motor novo é constituído de poliol ésteres (94-97%), antioxidantes (2-4%), antidesgaste/agentes de extrema pressão (1-3%), inibidores de corrosão (<0,5%), inibidores de ferrugem (< 0,5%) e agentes antiespumantes (na ordem de mg...

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“…ASV is one of the most sensitive methods for the determination of traces of numerous ions because of its remarkably low detection limit. Other advantageous features of ASV include relatively low cost instrumentation and the capability for simultaneous multi-element determination [1,[5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Pulse anodic stripping voltammetric determination of copper with an amoxicillin–nafion modified glassy carbon electrode

2008

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The analysis of Cu 2+ by pulse anodic stripping voltammetry using a Nafion-modified glassy Carbon electrode incorporated with Amoxicillin is described. A significant increase in the voltammetric response was achieved at the modified electrode compared to a bare glassy carbon electrode. Cu 2+ was accumulated in HAcNaAc buffer (pH 3.6) at a potential of -0.7 V (vs. Ag/ AgCl) for a certain time and then determined by pulse anodic stripping voltammetry. Parameters and conditions, such as the mass of Nafion, the concentration of Amoxicillin, the pH of medium, the accumulation potential, and the accumulation time were optimized. Under the optimum conditions, the calibration curve was linear in the range 8 9 10 -10 -2 9 10 -8 M with a correlation coefficient of 0.9998 and relative standard deviation 4.87% (n = 5). The detection limit was 1.3 9 10 -10 M. A study of interfering substances was also performed and the analytical utility of the method was demonstrated by applying to various pharmaceutical products.

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A multicommuted flow system for the determination of copper, chromium, iron and lead in lubricating oils with detection by flame AAS*1

Cited by 60 publications

References 11 publications

Biosurfactant Production and Biodegradation of Leather Dust from Tannery

Biosurfactant Production and Biodegradation of Leather Dust from Tannery

Determinação de metais em óleos lubrificantes, provenientes de motores de ônibus urbano, utilizando a FAAS

Pulse anodic stripping voltammetric determination of copper with an amoxicillin–nafion modified glassy carbon electrode

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