Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 260, Issue -, Pages 202-209Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2013.05.021
Keywords
Ultrasound-assisted extraction (UAE); Single extraction tests; Total reflection X-ray fluorescence (TXRF) spectrometry; EDTA; Acetic acid; Soils
Categories
Funding
- Spanish Ministry of Science and Innovation [CTQ2009-06956/BQU, CTQ2012-32788]
- Xunta de Galicia
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In this work, ultrasound-assisted extraction (UAE) was employed for acceleration of metal extraction from soil samples. After extraction, multielemental analysis (Cr, Mn, Fe, Ni, Cu, Zn and Pb) of EDTA and acetic acid extracts was performed by total reflection X-ray fluorescence spectrometry (TXRF). High-intensity ultrasonic processors, i.e. the ultrasonic probe (50 W) and the cup-horn sonoreactor (200 W) were applied. Both ultrasonic procedures were compared with a miniaturized version of the single extraction scheme proposed by the Standards, Measurements and Testing program (SM&T). The extraction time with EDTA was reduced from 1 h (conventional procedure) to 2 min (ultrasonic probe) or to 10 min (cup-horn sonoreactor). The time required for acetic acid extraction was also reduced from 16 h (conventional procedure) to 6 min (ultrasonic probe) or to 30 min (cup-horn sonoreactor). In addition, the amount of sample and extractants was drastically reduced as a result of the miniaturization implemented in the developed approaches. The combination of UAE and TXRF allows assessing the potential metal mobility and bioavailability in a simple way. (C) 2013 Elsevier B.V. All rights reserved.
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