Combination of sonication and heating for metal extraction from inorganic fertilizers prior to microwave-induced plasma spectrometry determinations

Lima, Alexandre F.; Lima, Fernanda F.; Richter, Eduardo M.; Muñoz, Rodrigo A.A.

doi:10.1016/j.apacoust.2015.03.009

Cited by 14 publications

(1 citation statement)

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“…In contrast to intensive sample preparation procedures involving high temperatures and pressures, acid extraction under mild conditions appears to be a promising alternative, particularly when associated with ultrasonic energy (Santos et al 2006). Ultrasound-assisted techniques have been widely employed for extraction of essentials and contaminant elements (Lima et al 2016;Santos et al 2014;Villa et al 2015) and can be considered an alternative for sample pretreatment, since ultrasound generates an auxiliary energy and accelerates some process, such as dissolution and leaching of substances from matrix (Armenta et al 2015;Capote and De Castro 2007;Tiwari 2015).…”

Section: Introductionmentioning

confidence: 99%

Multivariate Optimization for the Development of a Fast and Simple Ultrasound-Assisted Extraction Procedure for Multielemental Determination in Tea Leaves by Inductively Coupled Plasma Optical Emission Spectrometry (ICP OES)

et al. 2018

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The current study describes a fast and efficient procedure of ultrasound-assisted extraction for determination of Ca, Mg, K, Na, Cu, Zn, Mn, and Al in tea leaves by inductively coupled plasma optical emission spectrometry (ICP OES). The variables of procedure were optimized using the Box-Behnken design and the conditions selected were nitric acid concentration (1.0 mol L −1), sonication time (7 min), and sonication temperature (75°C). The extraction efficiency was calculated using the analyte concentration obtained by a total digestion procedure as reference. Accuracy was confirmed by analysis of certified reference material of apple leaves (NIST 1515) and spinach leaves (NIST 1570a) using the procedure proposed. A statistical evaluation using Student's t test showed that there is no significant difference between the value obtained with the proposed procedure and the certified value, at 95% confidence level. The proposed procedure was successfully applied and is a good alternative to conventional acid digestion procedure and can be applied to routine analysis for determination of Ca, Mg, K, Na, Zn, Mn, Cu, and Al in tea leaves used for the preparation of infusions.

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