Determinação direta de molibdênio em comprimidos polivitamínicos por voltametria em meio não aquoso

Almeida, Alex Magalhães de; Aleixo, Luiz Manoel; Andrade, João Carlos de; Puga, Aline Peregrina

doi:10.1590/s0100-40422006000100027

Cited by 2 publications

(2 citation statements)

References 10 publications

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“…2,3 Atomic absorption spectrometry (AAS) has been one of the most suitable analytical methods in the literature for the determination of molybdenum. 4,5 This technique is recommended for high sensitivity, low detection limit and high analytical quality, but a disadvantage is the high cost.…”

Section: Introductionmentioning

confidence: 99%

Chemometric Optimization of the Methodology for Determination of Molybdenum in Soils and Plants by Square Wave Adsorptive Stripping Voltammetry

Carvalho

Reis

et al. 2020

J. Braz. Chem. Soc.

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The method is based on the adsorptive accumulation of complex molybdenum(VI) with 8-hydroxyquinoline, using voltammetric square wave cathodic stripping voltammetry. The composition and concentration of the supporting electrolyte, frequency (Hz), amplitude (mV) and deposition time (s), were optimized by factorial design in relation to current reduction of molybdenum(VI). The optimum methodology provided the following values for the process variables: scan increase (0.5 mV), pulse amplitude (127 mV), frequency (96 Hz), adsorption time (80 s) and drop size (0.60 mm 2), the concentration of KNO 3 (2.0 mol L-1), acetate buffer (0.5 mol L-1) and 8-hydroxyquinoline (0.01 mol L-1). The results obtained after optimization showed a linear response in the range from 1.0 to 6.0 mg L-1 and limits of detection and quantification, respectively equal to 0.02 and 0.08 mg L-1. The molybdenum contained in the samples were determined using the optimized methodology, with values consistent with the values determined by atomic emission spectrometry with inductively coupled plasma (ICP-AES).

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Section: Introductionmentioning

confidence: 99%

Chemometric Optimization of the Methodology for Determination of Molybdenum in Soils and Plants by Square Wave Adsorptive Stripping Voltammetry

Carvalho

Reis

et al. 2020

J. Braz. Chem. Soc.

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“…Complexes containing molybdenum, such as tetrathiomolybdate, are administered in the treatment of Wilson's disease. 1,2 In addition, Mo is widely used in a variety of industrial processes and is a major component of metal alloys, lubricants and chemical catalysis. The determination of molybdenum in various matrices is essential to understand the toxicological and nutritional aspects of the element.…”

Section: Introductionmentioning

confidence: 99%

Sensitive determination of trace molybdenum in natural waters using dispersive liquid–liquid microextraction and electrothermal atomic absorption spectrometry

Silva

Lemos

2013

Anal. Methods

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A simple, sensitive and rapid method involving dispersive liquid-liquid microextraction was developed for the determination of molybdenum using electrothermal atomic absorption spectrometry. After injection of a ternary mixture containing trichloroethylene (extractor solvent), ethanol (disperser solvent) and ammonium pyrrolidinedithiocarbamate (chelating reagent), the extraction of molybdenum into the aqueous phase occurs. The quantity of the element in the enriched phase was measured using electrothermal atomic absorption spectrometry. Under optimized conditions (pH 2.5, 2.0 mL of disperser solvent, 50 mL of extraction solvent, 50.0 mL of 0.10% m/v chelating solution and centrifugation at 3000 rpm for 2.5 minutes), the method has a detection limit of 0.013 mg L À1 , a quantification limit of 0.044 mg L À1 and an enrichment factor of 75 for a sample volume of 5.0 mL. The certified reference material NIST 2781, Domestic Sludge, was used to assess the accuracy of the method. The proposed procedure was successfully applied to the determination of molybdenum in natural water samples. Experimental InstrumentationAbsorbance measurements were performed using an AAnalyst 400 model atomic absorption spectrometer and an HGA 900 model graphite furnace, both supplied by Perkin Elmer (Shelton, USA). A hollow cathode lamp for molybdenum analysis (Perkin Elmer) was also used. The pH measurements were performed using a Quimis Q400AS pH meter (Diadema, Brazil).

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Determinação direta de molibdênio em comprimidos polivitamínicos por voltametria em meio não aquoso

Cited by 2 publications

References 10 publications

Chemometric Optimization of the Methodology for Determination of Molybdenum in Soils and Plants by Square Wave Adsorptive Stripping Voltammetry

Chemometric Optimization of the Methodology for Determination of Molybdenum in Soils and Plants by Square Wave Adsorptive Stripping Voltammetry

Sensitive determination of trace molybdenum in natural waters using dispersive liquid–liquid microextraction and electrothermal atomic absorption spectrometry

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