Simultaneous determination of hydroquinone, resorcinol, phenol, m-cresol andp-cresol in untreated air samples using spectrofluorimetry and a custom multiplelinear regression-successive projection algorithm

MARCELO F. PISTONESI; MARÍA S. DI NEZIO; MARÍA E. CENTURIÓN; ADRIANA G. LISTA; WALLACE D. FRAGOSO; MÁRCIO J.C. PONTES; MÁRIO C.U. ARAÚJO; BEATRIZ S. FERNÁNDEZ BAND

TALANTA

ELSEVIER SCIENCE BV

Año: 2010 vol. 83 p. 320 - 323

0039-9140

In this study, a novel, simple, and efficient spectrofluorimetric method to determine directly and simultaneously five phenoliccompounds(hydroquinone, resorcinol, phenol,m-cresol and p-cresol) in air samples is presented. For this purpose, variable selection by the successive projections algorithm (SPA) is used in order to obtain simple multiple linear regression (MLR) models based on a small subset of wavelengths. For comparison, partial least square (PLS) regression is also employed in full-spectrum. The concentrations of the calibration matrix ranged from 0.02 to 0.2mgL−1 for hydroquinone, from 0.05 to 0.6mgL−1m-cresol and p-cresol) in air samples is presented. For this purpose, variable selection by the successive projections algorithm (SPA) is used in order to obtain simple multiple linear regression (MLR) models based on a small subset of wavelengths. For comparison, partial least square (PLS) regression is also employed in full-spectrum. The concentrations of the calibration matrix ranged from 0.02 to 0.2mgL−1 for hydroquinone, from 0.05 to 0.6mgL−1−1 for hydroquinone, from 0.05 to 0.6mgL−1 for resorcinol, and from 0.05 to 0.4mgL−1 for phenol, m-cresol and p-cresol; incidentally, such ranges are in accordance with the Argentinean environmental legislation. To verify the accuracy of the proposed method a recovery study on real air samples of smoking environment was carried out with satisfactory results (94–104%). The advantage of the proposed method is that it requires only spectrofluorimetric measurements of samples and chemometric modeling for simultaneous determination of five phenols. With it, air is simply sampled and no pre-treatment sample is needed (i.e., separation steps and derivatization reagents are avoided) that means a great saving of time.−1 for phenol, m-cresol and p-cresol; incidentally, such ranges are in accordance with the Argentinean environmental legislation. To verify the accuracy of the proposed method a recovery study on real air samples of smoking environment was carried out with satisfactory results (94–104%). The advantage of the proposed method is that it requires only spectrofluorimetric measurements of samples and chemometric modeling for simultaneous determination of five phenols. With it, air is simply sampled and no pre-treatment sample is needed (i.e., separation steps and derivatization reagents are avoided) that means a great saving of time.