Colorimetric pad for low-concentration formaldehyde monitoring in indoor air
| Autor: | Wisanti Laohaudomchok, Wantanee Phanprasit, Chaiyanun Tangtong, Sumate Pengpumkiat, Watcharaporn Wongsakoonkan, Vorakamol Boonyayothin |
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| Rok vydání: | 2021 |
| Předmět: |
0303 health sciences
Materials science Chromatography Indoor air Health Policy Public Health Environmental and Occupational Health Formaldehyde 010501 environmental sciences Permeation Shelf life 01 natural sciences Toluene Silica nanoparticles 03 medical and health sciences chemistry.chemical_compound chemistry General Earth and Planetary Sciences Benzene Volume concentration 030304 developmental biology 0105 earth and related environmental sciences General Environmental Science |
| Zdroj: | Journal of Health Research. 36:781-790 |
| ISSN: | 2586-940X |
| Popis: | PurposeThe purpose of this study was to develop an accurate, selective, low-cost and user-friendly colorimetric pad to detect formaldehyde at low concentration.Design/methodology/approach1-phenyl-1,3-butanedione, a reactive chemical, was selected to develop the colorimetric pad for indoor air formaldehyde measurement. Silica nanoparticle impregnated with the reactive chemical was coated on the cellulose filter surface to increase the reactive site. A certified formaldehyde permeation tube was used to generate six varied concentrations between 0.01 and 0.10 ppm in a test chamber. The color intensity on the pads was measured using an image processing program to produce a formaldehyde concentration reading chart. The colorimetric pad was tested for optimum reaction time, accuracy, precision, stability, selectivity and shelf life.FindingsThe color of the pads changed from white to yellow and the color intensity varied with the concentrations and appeared to be stable after exposure to formaldehyde for 8 hours. At room temperature, the stability of the pad was 7 days, and shelf life was 120 days. The accuracy, precision and bias of the pad were 12.38%, 0.032 and 6.0%, respectively. Carbonyl compounds, benzene and toluene did not interfere with the reading of this developed colorimetric pad.Originality/valueThe developed colorimetric pad meets NIOSH's criteria for an overall accuracy of ±25%, bias = 10%. They were accurate at low concentrations, user-friendly and had low cost compared to an electronic direct reading instrument (cost of chemicals and materials was 21.50 Bath or 0.69 USD per piece) so that favorable for the use of general people for health protection. |
| Databáze: | OpenAIRE |
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