Journal ArticleDOI
Alkaline solubilization and ultrasound assisted extraction for Cr and Pb determination in leather by atomic absorption spectrometry
TLDR
Alkaline solubilization with tetramethylammonium hydroxide (TMAH) and ultrasound-assisted extraction as sample preparation procedures were evaluated for the extraction and subsequent determination of Cr and Pb in leather samples by flame atomic absorption spectrometry (FAAS).Abstract:
Alkaline solubilization with tetramethylammonium hydroxide (TMAH) and ultrasound-assisted extraction as sample preparation procedures were evaluated for the extraction and subsequent determination of Cr and Pb in leather samples by flame atomic absorption spectrometry (FAAS). In the alkaline solubilization with TMAH, 0.10 g of the sample was heated to 95 ± 5 °C for 30 minutes in the presence of 2.75 mol L−1 TMAH in methanol medium. The procedure provided complete solubilization of the sample, resulting in limits of detection of 4 μg g−1 for Cr and 9 μg g−1 for Pb; the obtained RSD values were lower than 9.7%. Ultrasound-assisted extraction was evaluated with aliquots of 0.15 g of the sample, using HNO3, aqua regia and HCl as extraction solutions. However, this procedure was effective only for Pb extraction, using HNO3 and aqua regia as extractants. The limits obtained for Pb detection of 4 μg g−1 and RSD values lower than 3.8% were adequate for the determination. The simplicity of the proposed procedures for sample preparation, the reduced amounts of reagents required, minimizing contamination risks, and the low cost of the required instrumentation make these procedures excellent alternatives for the preparation of leather samples for elementary analysis.read more
Citations
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One-pot synthesis of novel water-dispersible fluorescent silicon nanoparticles for selective Cr2O72- sensing.
TL;DR: In this paper, fluorescent silicon nanoparticles (SiNPs) with good water solubility were facilely synthesized via a one-step hydrothermal method by using (3-aminopropyl)triethoxysilane (APTES) as the silicon source and natural antioxidant quercetin as the reducing agent.
Journal ArticleDOI
(Re) thinking Towards a Sustainable Analytical Chemistry: Part I: Inorganic Elemental Sample Treatment, Part II: Alternative Solvents and Extraction Techniques
Ana P.R. Santana,Patricia de Andrade Nascimento,Taciana G.S. Guimarães,I. M. Ribeiro Menezes,Daniel Fernandes Andrade,Andrea Oliveira,Mario H. Gonzalez +6 more
TL;DR: The principles of green chemistry aiming environmental, health, safety, and economic targets are discussed in this article , where the use of less toxic, diluted reagents and miniaturized methods are green sample strategies.
Journal ArticleDOI
Determination of toxic metals in leather by wavelength dispersive X-ray fluorescence (WDXRF) and inductively coupled plasma optical emission spectrometry (ICP OES) with emphasis on chromium
Ariane Maciel Neiva,Ariane Maciel Neiva,Marco Aurelio Sperança,Vinicius Câmara Costa,M. A. C. Jacinto,Edenir Rodrigues Pereira-Filho +5 more
TL;DR: WDXRF calibration models for Cr presented satisfactory figures of merit and the analysis of the leathers revealed an alarming concentration of total Cr in the samples reaching 21,353 mg kg−1.
Journal ArticleDOI
Separation of Leather, Synthetic Leather and Polymers Using Handheld Laser-Induced Breakdown Spectroscopy
TL;DR: In this article , the principal factor analysis was used to discriminate between four main groups of samples representing the tanning processes and the polymer or synthetic leather character, including synthetic and real leather.
Journal ArticleDOI
Multivariate optimization of a goat meat alkaline solubilization procedure using tetramethylammonium hydroxide for metals determination using FAAS.
Juscelia Pereira dos Santos Alves,Uillian Mozart Ferreira da Mata Cerqueira,Cleber Galvão Novaes,Walter Nei Lopes dos Santos,Sulene Alves Araújo,Marcos A. Bezerra +5 more
TL;DR: In this paper, multivariate designs were used to optimize an alkaline dissolution, assisted by ultrasound energy, procedure of goat meat using tetramethylammonium hydroxide (TMAH) aiming to determine Ca, Cu, Fe, K, Mg, Na and Zn by flame atomic absorption (FAAS) and emission (FAES) spectrometry.
References
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Journal ArticleDOI
Ultrasound assisted chrome tanning: Towards a clean leather production technology
TL;DR: This study confirms that US chrome tanning is an effective and eco-friendly tanning process which can produce a better quality leather product in a shorter process time with a lower chromium dose.
Journal ArticleDOI
Determination of inorganic contaminants in polyamide textiles used for manufacturing sport T-shirts
Erika Matoso,Solange Cadore +1 more
TL;DR: An acid microwave closed vessel digestion method was used for the determination of inorganic contaminants in polyamide raw materials (pellets) and textiles by inductively coupled plasma optical emission spectrometry (ICP OES) showing good accuracy.
Journal ArticleDOI
Ultrasound-assisted pretreatment for multielement determination in maize seed samples by microwave plasma atomic emission spectrometry (MPAES)
Jorgelina Zaldarriaga Heredia,Jorgelina Zaldarriaga Heredia,Mariel Cina,Marianela Savio,Marianela Savio,Raul Andres Gil,José Manuel Camiña,José Manuel Camiña +7 more
TL;DR: In this paper, a rapid and simple ultrasound-assisted pretreatment for maize samples is proposed, and the performance of microwave plasma atomic emission spectrometry (MPAES) for the analysis of Ag, Al, Ba, Be, Ca, Cd, Co, Cr, Cu, Fe, Mg, Mn, Mo, Na, Ni, Pb, Tl, V and Zn in maize seeds, was evaluated.
Journal ArticleDOI
Lead biomonitoring in different organs of lead intoxicated rats employing GF AAS and different sample preparations.
Rafael Arromba de Sousa,Céphora Maria Sabarense,Gustavo Ligeri Pereira do Prado,Konradin Metze,Solange Cadore +4 more
TL;DR: The results suggested that there is a profile for lead bioaccumulation in these animals, which seemed to adapt themselves to continuous lead exposure.
Journal ArticleDOI
Determination of Ca, Cu, Fe and Mg in fresh and processed meat treated with tetramethylammonium hydroxide by atomic absorption spectrometry
Adriane Medeiros Nunes,Tanize Acunha,Eliézer Quadro Oreste,Fábio G. Lepri,Mariana Antunes Vieira,Adilson J. Curtius,Anderson Schwingel Ribeiro +6 more
TL;DR: In this paper, a simple method for treating fresh and processed meat with tetramethylammonium hydroxide (TMAH) is proposed for the determination of Ca, Fe and Mg by flame atomic absorption spectrometry (FAAS) and Cu by graphite furnace atomic absorption spectrumetry (GFAAS).