Evaluation of Greenness of Methods for the Determination of Mercury in Mushrooms
Maria L. Cervera,
Miguel de la Guardia.
In the present study, two analytical methodologies, one based on direct thermal degradation of samples followed
by atomic absorption analysis (TDA-AAS), and another one, which consists on acid microwave-assisted digestion
(MAD) followed by cold vapour atomic fluorescence determination (CV-AFS), have been applied to determine mercury
in mushrooms. Both methodologies found the same concentration values, from 258 to 570 ng g-1 (dry weight), for nine
samples. Analysis based on thermal degradation provided a limit of detection of 3 ng g-1 similar to that found by CV-AFS,
and a relative standard deviation of 3 %, three times higher than that of CV-AFS. However, the direct analysis of untreated
samples agrees well with green analytical principles because it involves less reagents consume and reduces waste
generation. In fact, at analytical Eco-Scale, TDA-AAS procedure involves a green score of 92 points in front of the 59
points obtained for CV-AFS method.
Keywords: Analytical eco-scale, cold vapour, direct analysis, green analytical chemistry, mercury, microwave-assisted digestion,
mushroom, thermal degradation.
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