Gigante, A. C.Gotardo, M. A.Tognolli, J. O.Pezza, Leonardo [UNESP]Pezza, Helena Redigolo [UNESP]2014-05-202014-05-202004-05-01Microchemical Journal. Amsterdam: Elsevier B.V., v. 77, n. 1, p. 47-51, 2004.0026-265Xhttp://hdl.handle.net/11449/33697In the present study. a spectrophotometric method for the determination of formaldehyde by using chromotropic acid was devised. in which the use of potentially hazardous and corrosive concentrated sulfuric acid was eliminated and advantageously C replaced by a mixture of H, concentrated H3PO4 and H2O2. The reaction between formaldehyde and chromotropic acid (CA) in a cone phosphoric acid medium was accelerate by irradiating the mixture with microwave energy for 35 s (1100 W), producing a violetred compound (lambda(max)=570 nm). Beer's Law is obeyed in a concentration range of 0.8-4.8 mg 1(-1) of formaldehyde with a good correlation coefficient (r = 0.9968). The proposed method was applied in the analysis of formaldehyde in commercial disinfectants. Recoveries were within 98.0-100.4%, with standard deviations ranging from 0.03 to 0.13%. (C) 2003 Elsevier B.V All rights reserved.47-51engformaldehydechromotropic acidspectrophotometrymicrowave ovenArtigo10.1016/j.microc.2003.12.002WOS:000221065100008Acesso restrito597890859185352431921250983611210000-0003-0197-7369