Cold ultrasonic acid extraction of copper, lead and zinc from soil samples

Al-Merey, R.; Al-Masri, M.S.; Bozou, R

doi:10.1016/s0003-2670(01)01431-3

Cited by 34 publications

(14 citation statements)

References 9 publications

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“…The ultrasound-assisted extraction of an analyte from a sample is a clean method and, like the previous one, also shortens the procedure for preparing a sample for analysis. However, it is dependent on the strength of the ultrasound waves, the position at which the wave reaches a maximum, the time for which the wave is allowed to act on the sample, the kind and concentration of acid, the temperature of the process and the chemical properties of the matrix (Al-Merey et al, 2002). Despite its many faults, ultrasound-assisted extraction is a standard procedure in laboratories (Rabajczyk, 2006).…”

Section: Extraction Techniquesmentioning

confidence: 99%

The speciation and physico-chemical forms of metals in surface waters and sediments

Namieśnik

Rabajczyk

2010

Chemical Speciation & Bioavailability

144

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Surface waters can be contaminated in many ways, e.g., by solutions and suspended matter. Moreover, insoluble substances in colloidal form, in suspension or adsorbed on solid bodies can dissolve in response to changing physical and chemical conditions and become a secondary source of surface water pollution, thereby endangering wildlife. In addition, if we take into account varying rates of flow, contaminants can be transported over considerable distances. Hydrological processes, which determine factors, such as the rate of sedimentation, also influence the quality of surface waters; bottom sediments can contain large quantities of accumulated organic and inorganic compounds, including heavy metals. The physical and chemical properties of aquatic ecosystems are characterized by a number of interdependent parameters. Hence, factors such as temperature, oxygen content and pH of a water body can alter the solubility of the salts present in it, the forms of occurrence of particular species, as well as their bioavailability and toxicity. Thus it is necessary to determine the various species of metals present in the different compartments of the aquatic ecosystem.

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Section: Extraction Techniquesmentioning

confidence: 99%

The speciation and physico-chemical forms of metals in surface waters and sediments

Namieśnik

Rabajczyk

2010

Chemical Speciation & Bioavailability

144

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“…However, US-assisted extractions have been applied to accelerate acid extractions of soils and sediments, which present similar sample matrix. [16][17][18][19] The typical sample mass used in these works varied from 20 to 500 mg employing diluted nitric or hydrochloric acid solutions as extractors and sonication times no longer than 60 min. Based on this, initial tests were performed using 100 mg of sample treated either with HNO 3 or HCl solutions of different concentrations and sonication times of 5, 10 and 30 min.…”

Section: Ultrasound-assisted Extractionmentioning

confidence: 99%

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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“…Por otra parte, se pueden presentar problemas de disolución incompleta, precipitación de analitos insolubles, contaminación de la muestra y perdida de elementos volátiles (Kazi et al, 2009;Merey et al, 2002). Debido a estos inconvenientes, se han propuesto otros procedimientos para la preparación de muestras vegetales, como digestión asistida por microondas y ultrasonido, sin embargo, el equipo de la digestión asistida por microondas es costoso y limita su aplicación (Bakkali et al, 2009;Soylak et al, 2007).…”

Section: Introduccionunclassified

Desarrollo y validación de un método ambientalmente amigable para determinación de metales pesados en pastos

Chaparro

García

Cardona

et al. 2016

rcia

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Los metales pesados son peligrosos para los seres vivos y el medio ambiente, pues no pueden ser degradados y pueden llegar a los seres humanos a través la cadena trófica, por lo tanto, su determinación en diferentes matrices para consumo humano y animal, es de vital importancia. La metodología más utilizada para su extracción, es cenizas, la cual conlleva a tiempos largos de análisis y elevado consumo de energía, por esta razón, en el presente trabajo se desarrolló y validó un método ambientalmente amigable para la digestión y extracción de Cd+2 y Pb+2 en pastos, utilizando ultrasonido y espectroscopia de absorción atómica. Se evaluaron diferentes variables que afectan la digestión, como posición en el ultrasonido, peso de muestra, solvente, volumen del solvente, tiempo de sonicación y tipo de recipiente, en muestras de pastos dopadas con los metales, teniéndose como variable de respuesta, el porcentaje de recuperación. Las condiciones para extraer Cd+2 y Pb+2 en estas pasturas, fueron: 0,50g de tejido vegetal; 3,00mL de HCl:HNO3-3:1 expuestos 60min al ultrasonido, en tubos de vidrio cónicos. Este procedimiento mostró un comportamiento lineal en el rango de 0,50 - 8,00mg/Kg con R2 de 0,99 tanto para Cd como para Pb. Los límites de detección y cuantificación, fueron 0,25 y 0,43mg/Kg para Cd; 0,22 y 0,37mg/Kg para Pb. La metodología propuesta, se comparó con la técnica clásica y permitió determinar niveles trazas de estos metales tóxicos, en forraje proveniente del Magdalena medio, con porcentajes de recuperación de97,54 y 98,62%, respectivamente.

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Cold ultrasonic acid extraction of copper, lead and zinc from soil samples

Cited by 34 publications

References 9 publications

The speciation and physico-chemical forms of metals in surface waters and sediments

The speciation and physico-chemical forms of metals in surface waters and sediments

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

Desarrollo y validación de un método ambientalmente amigable para determinación de metales pesados en pastos

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