Marques Luiz, Vitor Hugo [UNESP]Pezza, Leonardo [UNESP]Pezza, Helena Redigolo [UNESP]2014-05-202014-05-202012-10-15Food Chemistry. Oxford: Elsevier B.V., v. 134, n. 4, p. 2546-2551, 2012.0308-8146http://hdl.handle.net/11449/25866This paper describes a simple, portable and environmentally friendly procedure for the determination of nitrite by combined spot test/diffuse reflectance spectroscopy on filter-paper. The method is based on the diazotization reaction of dapsone (4,4'-diamino-diphenyl sulphone, DAP) and (naphthyl)ethylenediamine hydrochloride (NED) with nitrite in acidic medium, yielding a coloured compound on the surface of a filter paper. Experimental design methodologies were used to optimise the measurement conditions. The reflectometric measurements were carried out at 545 nm and the linear range obtained was 0.29-5.0 mg L-1 of nitrite (R = 0.997), with detection and quantification limits of 0.09 and 0.29 mg L-1, respectively. The proposed method was applied successfully to the analysis of nitrite in meat products and well water samples. (C) 2012 Elsevier Ltd. All rights reserved.2546-2551engNitriteDiffuse reflectanceFilter paperMeat productsWell waterArtigo10.1016/j.foodchem.2012.04.068WOS:000305859800113Acesso restrito597890859185352431921250983611210000-0003-0197-7369