Fast ultrasound-assisted treatment of urine samples for chronopotentiometric stripping determination of mercury at gold film electrodes

Muñoz, Rodrigo A.A.; Felix, Fabiana S.; Augelli, Márcio Antônio; Pavesi, Thelma; Angnes, Lúcio

doi:10.1016/j.aca.2006.04.034

Cited by 50 publications

(37 citation statements)

References 51 publications

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“…These results confirm the similar performance of a vortex shaker and an ultrasonic bath for metal extraction procedures. Therefore, it is not confirmed the presence of additional benefits (beyond mechanical agitation) exclusively provided by sonication (such as sonolysis of water which may generate hydroxyl and hydrogen peroxide) 10 which would contribute for the improvement of extraction performance. Such benefits are definitively more pronounced when ultrasonic horns are employed.…”

Section: Vortex-assisted Extractionmentioning

confidence: 93%

“…3 Microwaveassisted methods for sample preparation have been developed in order to overcome such drawbacks. [4][5][6][7] More recently, ultrasound-assisted (US-assisted) methods for sample preparation have been reported mainly using ultrasonic baths for the development of faster and less expensive procedures, operating at room-temperature and atmospheric-pressure and reducing the use of concentrated acids and large sample amounts, [8][9][10][11][12] and hence contribute to the achievement of the "green" principles of analytical chemistry. 13 In this work, the development of an alternative sample preparation procedure for the analyses of inorganic fertilizers based on the US-assisted extraction using ultrasonic bath is described.…”

Section: Introductionmentioning

confidence: 99%

“…Soc. 1520 operating at room-temperature and atmospheric-pressure and reducing the use of concentrated acids and large sample amounts, [8][9][10][11][12] and hence contribute to the achievement of the "green" principles of analytical chemistry. 13 In this work, the development of an alternative sample preparation procedure for the analyses of inorganic fertilizers based on the US-assisted extraction using ultrasonic bath is described.…”

Section: Introductionmentioning

confidence: 99%

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Alternative analytical method for metal determination in inorganic fertilizers based on ultrasound-assisted extraction

Lima¹,

Richter²,

Muñoz³

2011

J. Braz. Chem. Soc.

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Neste trabalho, o desenvolvimento de um método limpo de preparo de amostras para a análise de fertilizantes inorgânicos baseado em extração assistida por ultrassom usando um banho de ultrassom é descrito. Amostras (70 mg) foram sonicadas por 5 min na presença de 2 mL de HNO 3 50% (v/v) dentro de tubos de vidro. A determinação de cobre, chumbo e cádmio nos extratos foi realizada empregando espectrometria de absorção atômica com chama (FAAS). É também demonstrada a possibilidade de empregar um agitador vortex como fonte de agitação mecânica para realizar a extração dos metais. O método proposto usando banho de ultrassom ou agitador vortex é simples, versátil e minimiza a geração de resíduos devido ao emprego de volumes reduzidos de ácido e amostra, contribuindo para o desenvolvimento de um método analítico limpo.In this work, the development of a "green" sample preparation procedure for the analysis of inorganic fertilizers based on ultrasound-assisted extraction using an ultrasonic bath is described. Samples (70 mg) were sonicated for 5 min in the presence of 2 mL of 50% (v/v) HNO 3 inside glass tubes. The determination of copper, lead and cadmium in the extracts were carried out by flame atomic absorption spectrometry (FAAS). It is also demonstrated the possibility of using of a vortex shaker as a mechanical agitation source to perform the metal extraction. The proposed extraction procedure using an ultrasonic bath or a vortex shaker is simple and versatile, and minimizes waste generation due to the employment of reduced volumes of acid and sample, contributing for the development of a clean analytical method. Keywords: fertilizer, ultrasound, vortex, metals, extraction IntroductionInorganic fertilizers are a major source of metals in agricultural soils. Special attention is given to metals such as cadmium and lead due to their high toxicity. These metals can be absorbed by plants in agricultural lands and can reach the aquatic ecosystem health. Through rivers and streams, the metals are transported in suspended sediments or as dissolved species in water. The most deleterious effects of metal pollution in the aquatic environment are caused by the presence of dissolved metal species in water. 1 In this way, the quality control of fertilizers is of capital importance to prevent environmental pollution by metals. The official method established by the Brazilian Ministry of Agriculture (Ministério de Agricultura, Pecuária e Abastecimento, MAPA) for the analysis of inorganic fertilizers involves a sample preparation step prior to atomic absorption spectrometric determinations of metals. 2 The sample preparation procedure consists of wet digestion with concentrated hydrochloric (10 mL) and nitric (2.5 mL) acids in hot plate in order to release the analytes from the sample matrix. 2 The procedure takes around 40 min and employs large volumes of acids and sample, and consequently generates large amount of chemical waste in a routine laboratory. Moreover, the procedure is not adequate for the determination of volatile ...

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Section: Vortex-assisted Extractionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Alternative analytical method for metal determination in inorganic fertilizers based on ultrasound-assisted extraction

Lima¹,

Richter²,

Muñoz³

2011

J. Braz. Chem. Soc.

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“…Plastic bottles, autosampler cups, and glassware were cleaned by soaking in 20% (v/v) HNO 3 for 24 h. This material was then rinsed three times with deionized water. Iron stock solutions (Fe(NO 3 ) 3 •9H 2 O) were prepared daily by serial dilution of commercially available 1000 mg L -1 standard solutions (Titrisol, Merck, and Darmstadt, Germany). Pd solution (Pd(NO 3 ) 2 , Merck) in a 25 mL volumetric flask and diluting to volume with deionized water.…”

Section: Reagentsmentioning

confidence: 99%

“…The increase of pressure favors penetration between insoluble interfaces which improves extractions of a number of analytes from different matrix samples. It is worth noting that the ultrasound-generated radicals accelerate the oxidation process of an organic sample and that the release of analytes is facilitated [3]. The main ultrasound devices employed for analytical purposes are the ultrasonic horn, which focuses its energy on a localized region providing more efficient cavitation, and the ultrasonic bath, which distributes its energy along the bath.…”

Section: Introductionmentioning

confidence: 99%

Ultrasound assisted pseudo-digestion for determination of iron and manganese in citric acid fermentation mediums by electrothermal atomic absorption spectroscopy

Pourhossein¹,

Madani²,

Shahlaei³

et al. 2009

Open Chemistry

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A sensitive, simple and rapid method for ultra-trace determination of iron and manganese based on ultrasound assisted pseudodigestion in citric acid fermentation medium samples (beet and cane molasses and raw sugar based mediums) is described. Parameters influencing pseudo-digestion, such as sonication time, sample mass and solvent system were fully optimized. Final solutions obtained upon sonication were analyzed by electrothermal atomic absorption spectrometry (ETAAS). The best conditions for metal pseudo-digestion were as follows: a 25, 30 and 20 min sonication time for beet molasses, cane molasses and raw sugar based medium samples, respectively, 0.7 g sample mass of raw sugar based samples, 0.5 g sample mass of molasses based samples and an extraction mixture of concentrated HNO 3 -H 2 O 2 , in 25 mL of solvent. Analytical results obtained for the two metals by ultrasound assisted pseudo-digestion and conventional wet digestion methods showed a good agreement. This method reduces the time required for all treatments (heating to dryness, cooling and separation) in comparison with conventional wet digestion method. The accuracy of the method was tested by comparing the obtained results with that of conventional wet digestion method.© Versita Warsaw and Springer-Verlag Berlin Heidelberg.

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Peak Area: the Instrumental Datum to Improve the Determination at Ultratrace Level Concentration of Mercury(II) at Gold Electrode

Locatelli

2008

Electroanalysis

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Peak area as instrumental datum for determining the concentration of metals in solution instead of peak height is proposed for analytical voltammetric determinations. In the case of species present at ultra-trace concentration level or having low reversibility degree electrodic processes, the employment of peak area permits to achieve limits of detection lower even more of one order of magnitude. The present work shows the possibility of determining, at ultratrace level concentration, mercury(II) by differential pulse anodic stripping voltammetry (DPASV). The analytical procedure was verified by the analysis of standard reference materials Estuarine Sediment BCR-CRM 277, River Sediment BCR-CRM 320 and Mercury in Water NIST-SRM 1641d and applied to sediments and seawaters sampled in a lagoon ecosystem connected with Adriatic Sea (Ravenna area, Italy). The accuracy, expressed as relative error e (%), and the precision as repeatability, expressed as relative standard deviation s r (%), were satisfactory being lower than 6%. To better validate the analytical procedure, a comparison with spectroscopic measurements is also reported.

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Fast ultrasound-assisted treatment of urine samples for chronopotentiometric stripping determination of mercury at gold film electrodes

Cited by 50 publications

References 51 publications

Alternative analytical method for metal determination in inorganic fertilizers based on ultrasound-assisted extraction

Alternative analytical method for metal determination in inorganic fertilizers based on ultrasound-assisted extraction

Ultrasound assisted pseudo-digestion for determination of iron and manganese in citric acid fermentation mediums by electrothermal atomic absorption spectroscopy

Peak Area: the Instrumental Datum to Improve the Determination at Ultratrace Level Concentration of Mercury(II) at Gold Electrode

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