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Sensitive Spectrophotometric Determination of Formaldehyde by Inhibition of the Malachite Green–Sulfite Reaction

✍ Scribed by Abbas Afkhami; Mostafa Rezaei

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
43 KB
Volume
63
Category
Article
ISSN
0026-265X

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✦ Synopsis

A simple, sensitive, and selective method for rapid determination of ultratrace quantities of formaldehyde based on its inhibitory effect on the malachite green-sulfite reaction is described. The reaction is monitored spectrophotometrically by measuring the decrease in absorbance at 613 nm at a fixed time of 61 s. The method allows the determination of formaldehyde in the range 14 -700 ng/ml. The limit of detection was 7 ng/ml and the relative standard deviation for 10 determinations of 140 ng/ml formaldehyde was 1.2%. The method is applied to the determination of formaldehyde in chemical industrial wastewater and phenol formaldehyde resin.

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