NOVEL METHOD FOR DETERMINATION OF ZINC TRACES IN BEVERAGES AND WATER SAMPLES BY SOLID SURFACE FLUORESCENCE USING A CONVENTIONAL QUARTZ CUVETTE

TALÍO, MARÍA CAROLINA; ACOSTA, GIMENA; ACOSTA, MARIANO; OLSINA, ROBERTO; FERNÁNDEZ, LILIANA

FOOD CHEMISTRY

ELSEVIER SCI LTD

Lugar: Amsterdam; Año: 2015 vol. 175 p. 151 - 156

0308-8146

A new method for zinc pre-concentration/separation and determination by molecular fluorescence is pro- 37 posed. The metal was complexed with o-phenanthroline and eosin at pH 7.5 in Tris; a piece of filter paper 38 was used as a solid support and solid fluorescent emission measured using a conventional quartz cuvette. 39 Under optimal conditions, the limits of detection and quantification were 0.36 _ 10_3 and 1.29 _ 10_3 - 40 lg L_1, respectively, and the linear range from 1.29 _ 10_3 to 4.50 lg L_1. This method showed good sen- 41 sitivity and selectivity, and it was applied to the determination of zinc in foods and tap water. The 42 absence of filtration reduced the consumption of water and electricity. Additionally, the use of common 43 filter papers makes it a simpler and more rapid alternative to conventional methods, with sensitivity and 44 accuracy similar to atomic spectroscopies using a typical laboratory instrument.