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Issue 1, 2001
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A new fluorimetric method for the determination of formaldehyde in air based on the liquid droplet sampling technique

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Abstract

A new, simple, sensitive, selective and in-field fluorimetric method for the determination of formaldehyde is proposed. The reaction of formaldehyde with hydralazine in acidic medium, heating on a boiling water-bath for 25 min, produces s-triazolo[3,4-a]phthalazine (Tri-P). The fluorescence intensity of the product formed (Tri-P) was determined at λem = 389 nm with λex = 236 nm. The fluorescence intensity is linear over a formaldehyde concentration range of 1.2–33.0 μg l−1. The proposed method was applied successfully to the determination of formaldehyde sampled from the atmosphere using the liquid droplet technique. Formaldehyde vapour in a wind tunnel was produced by a mean of permeater. A linear curve was obtained between the concentration in the wind tunnel and that in the droplet. The detection limit for formaldehyde was 2.0 μg l−1 with RSDs varying from 3 to 12% in ambient air, using a droplet correction solution (boric acid and hydralazine). The effect of interfering substances on the determination shows that most cations and anions did not interfere. The results obtained were satisfactory compared with a reference method.

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Article information


Submitted
26 Jul 2000
Accepted
30 Oct 2000
First published
19 Dec 2000

Analyst, 2001,126, 104-108
Article type
Paper

A new fluorimetric method for the determination of formaldehyde in air based on the liquid droplet sampling technique

M. I. H. Helaleh, M. Kumemura, S. Fujii and T. Korenaga, Analyst, 2001, 126, 104
DOI: 10.1039/B006058P

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