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|Title: ||Comparative study between probe focussed sonication and conventional stirring in the evaluation of cadmium and copper in plants|
|Authors: ||Pereira, Sara|
Fonseca, Luís P.
Capelo, José L.
Pinto, Ana P.
Gonçalves, Maria L. S.
Mota, A. M.
|Editors: ||Pauly, Steffen|
|Issue Date: ||2010|
|Citation: ||Anal Bioanal Chem (2010) 398:2315–23|
|Abstract: ||Abstract Ultrasound (US)-assisted extraction has been
widely used for metal ion extraction in plants due to its
unique properties of decreased extraction time, minimal
contamination, low reagent consumption and low cost.
However, very few papers present a sound comparison
between probe-focussed sonication and conventional stirring
in the evaluation of metal ion extraction in plants. In
this study, ultrasonic-assisted digestion has been evaluated
and compared to magnetic stirring for total copper and
cadmium determination by atomic absorption spectrometry
in biological samples (plants, plankton and mussels). The
same experimental conditions of sample amount and
particle size, extractant solution and extraction time were
applied for both ultrasound and magnetic stirring-assisted extraction methods in order to truly compare their effect on
metal ion solubilisation. To gain further insight in this issue,
dried and fresh plants were tested. The results obtained
indicated that osmotic tension in cell walls, produced when
dried and powdered samples were immersed in the
extractant solution, had an important contribution to metal
ion solubilisation, the enhancement due to US for the same
purpose being negligible.|
|Appears in Collections:||QUI - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica|
MED - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica
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