A simple and highly sensitive colorimetric detection method for gaseous formaldehyde.
A colorimetric detection method using amine-functionalized polymer films doped with a pH indicator has been developed for the rapid, sensitive, and quantitative detection of gaseous formaldehyde at concentrations well below the immediately dangerous to life or health (IDLH) limit. In 1 min, visible color changes are easily observed, even down to the permissible exposure limit (PEL) at 750 ppb. The limit of detection is below 50 ppb (7% of the PEL) after 10 min of exposure. This sensor is essentially unaffected by changes in humidity or temperature (4 to 50 degrees C) and is not sensitive to common interferents.
Feng
Liang
L
Department of Chemistry, University of Illinois at Urbana-Champaign, 600 South Mathews Avenue, Urbana, Illinois 61801, USA.
Musto
Christopher J
CJ
Suslick
Kenneth S
KS
D003124:Colorimetry / Q000379:methods*; D005557:Formaldehyde / Q000737:chemistry*; D005740:Gases; D015394:Molecular Structure
D005740:Gases; D005557:Formaldehyde