Desenvolvimento de método espectrofotométrico para análise de paraformaldeído em saneantes comerciais e industriais

Abstract

O presente artigo descreve uma metodologia espectrofotométrica para a análise de paraformaldeído presente em amostras de saneantes comerciais e industriais, utilizando-se ácido cromotrópico (ACT), ácido clorídrico concentrado e peróxido de hidrogênio, produzindo um composto púrpura - avermelhado (lambda max = 575 nm). A lei de Beer é obedecida numa faixa de concentração de 0,8 - 4,8 mg L-1 em formaldeído, apresentando excelente coeficiente de correlação (r = 0,9999). Os valores obtidos nas análises concordaram muito favoravelmente com os obtidos pelo procedimento padrão recomendado pelo NIOSH (National Institute for Occupational Safety and Health).

Cosmetovigilance in Hair Straighteners: Determination of Formaldehyde Content by Spectrophotometry and Label Evaluation

“…The main one is the use of concentrated sulfuric acid by the toxicity and corrosivity that it presents. Therefore, some authors have proposed modification methodology that could minimize these disadvantages [12,[19][20][21][22][23].…”

A sensitive flow analysis system for the fluorimetric determination of low levels of formaldehyde in alcoholic beverages

“…Several methods have been developed for aldehyde determination, including color reaction with chromotropic acid [17,18], pararosaniline-bisulfite (Schiff reagent) [19,20], malachite green-bisulfite [21,22], brilliant green-bisulfite [23], enzymatic methods [8][9][10], liquid chromatography by derivatization with 2,4-dinitrophenylhydrazine [24][25][26][27][28], reaction with 3-methyl-2-benzothiazolone hydrazone (MBTH) [29][30][31][32][33] and reaction with Fluoral-P [1,11,[34][35][36][37][38][39][40][41][42][43].…”