Journal
JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY
Volume 21, Issue 7, Pages 1377-1383Publisher
SOC BRASILEIRA QUIMICA
DOI: 10.1590/S0103-50532010000700025
Keywords
iron phthalocyanine; amperometric sensor; methylbenzylidene camphor
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Funding
- CNPq
- ABN/Banco Real
- FAPESP
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The construction and application of a biomimetic sensor for determination of 4-methylbenzylidene camphor (4-MBC), an ultraviolet (UV) radiation protector, are described. The sensor was prepared by modifying a carbon paste electrode with iron(III) phthalocyanine chloride (FePcCl). Amperometric measurements carried out with the sensor under an applied potential of 0.0 V vs. Ag vertical bar AgCl in a mixture of tetrahydrofuran and 0.1 mol L-1 H2SO4 solution (30:70 volume ratio) showed a linear response range from 1.8x10(-4) to 9.0x10(-4) mol L-1. A detailed selectivity investigation for other nine UV filters was also performed. A sensor response mechanism was proposed and the results for 4-MBC quantification in commercial sunscreens and in water from swimming pools and rivers are presented.
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