In-line, titanium dioxide-catalysed, ultraviolet mineralization of toxic aromatic compounds in the waste stream from a flow injection-based resorcinol analyser

To avoid generating toxic mixtures of phenolic compounds during the determination of resorcinol (a phenolic compound used in tanning, resin and dye manufacture and in pharmaceutical formulations) a clean analytical procedure was developed. The method involved spectrophotometric determination of reso...

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Bibliographic Details
Published in:Analyst (London) 1995, Vol.120 (2), p.231-235
Main Authors: DE LA GUARDIA, M, KHALAF, K. D, HASAN, B. A, MORALES-RUBIO, A, CARBONELL, V
Format: Article
Language:English
Subjects:
Analytical chemistry
Chemistry
Exact sciences and technology
Spectrometric and optical methods
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Summary:To avoid generating toxic mixtures of phenolic compounds during the determination of resorcinol (a phenolic compound used in tanning, resin and dye manufacture and in pharmaceutical formulations) a clean analytical procedure was developed. The method involved spectrophotometric determination of resorcinol by reaction with para-aminophenol (PAP) and included an in-line decomposition of analytical wastes. The detoxification step was based on in-line titanium dioxide-catalysed photodegradation of the indophenol dye formed and the remaining unreacted PAP. The resorcinol-PAP complex (indophenol dye) absorbed at 540 nm. After the measurement step, the waste stream was merged with a titanium dioxide slurry (0.5 g per litre in 0.22 M hydrochloric acid) and passed through a UV photochemical reactor consisting of a PTFE tube rolled on a UV lamp with a maximal irradiation wavelength of 254 nm. Under these conditions the waste stream was completely detoxified.
ISSN:0003-2654
1364-5528
DOI:10.1039/AN9952000231