Trace element content and morphological characteristics in microscale of commercially available clays used as cosmetic products

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Published: Jan 24, 2013
DOI: https://doi.org/10.12681/bgsg.11117
Keywords:
Industrial minerals Microporous natural raw materials Inorganic contaminants
K. Giouri
Aristotle University of Thessaloniki, School of Geology, Department of Mineralogy-Petrology-Economic Geology
A. Papadopoulos
Aristotle University of Thessaloniki, School of Geology, Department of Mineralogy-Petrology-Economic Geology
A. Bourliva
Aristotle University of Thessaloniki, School of Geology, Department of Mineralogy-Petrology-Economic Geology
E. Tzamos
Aristotle University of Thessaloniki, School of Geology, Department of Mineralogy-Petrology-Economic Geology
L. Papadopoulou
Aristotle University of Thessaloniki, School of Geology, Department of Mineralogy-Petrology-Economic Geology
A. Filippidis
Aristotle University of Thessaloniki, School of Geology, Department of Mineralogy-Petrology-Economic Geology
Abstract
Two kinds of clays (one white and one green) available in pharmacies and herbalist’s shops in the Greek market have been studied for their concentrations in trace elements, namely As, Be, Cd, Cr, Hg, Ni, P, Pb, Sb, Se, Te, Tl and Zr. According to EC Regulation 1223/2009, the presence of the analyzed trace elements and their compounds, are prohibited in cosmetics. The most abundant trace elements of the white clay are P (330 ppm), Pb (220 ppm) and Zr (11 ppm), while for the green clay are P (1250 ppm), As (43 ppm), Cr (31 ppm), Pb (30 ppm) and Ni (23 ppm). Compared to the global shale average concentration of elements, Pb is enriched 11-times in the white clay and As is enriched 3-times in the green clay. The depleted trace elements of the white clay are As, Cd, Cr, Hg, Ni, P, Sb, Se, Te, Tl and Zr, while of the green one are Cr, Hg, Ni, Sb, Te, Tl and Zr. Concerning the morphological characteristics, differences were observed in the particle size and shape between the white and green clay aggregates.
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  • Geochemistry and Biogeochemistry
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