A kind of formaldehyde color test paper and its preparation method and application

Abstract

The invention discloses a piece of formaldehyde colour-rendering test paper and a preparation method. The preparation method disclosed by the invention comprises the following steps: firstly, mixing and dissolving ammonium acetate, glacial acetic acid and acetylacetone according to the proportion of 25g:3mL:(0.5-1.5)mL, then, adding purified water, thus obtaining mixed solution 1, in which the volume percentage concentration of acetylacetone is 0.5-1.5%; adding water-soluble polyacrylic acid resin into the obtained mixed solution 1 according to the proportion of (1-3)g:1ml, thus obtaining mixed solution 2 after stirring and mixing uniformly; and finally, after immersing a piece of kapok paper in the mixed solution 2 for 2 h, naturally airing in air, and thus obtaining the formaldehyde colour-rendering test paper. The formaldehyde colour-rendering test paper can be used for judging working conditions of an indoor air-purifying and formaldehyde-removing device; and the lowest detection lower limit is 0.01 mg / m<3>; and the relative concentration of formaldehyde is reflected according to the colour change of the formaldehyde colour-rendering test paper.

Description

technical field [0001] The invention relates to a formaldehyde color test paper and a preparation method and application thereof, belonging to the field of air detection. Background technique [0002] Formaldehyde, a colorless gas with a distinctive pungent odour. It has a strong reducing effect under alkaline conditions. Formaldehyde is toxic. Exposure to low concentrations can cause headaches, dizziness, fatigue, sensory disturbances, decreased immunity, and drowsiness, memory loss or neurasthenia, and mental depression; chronic poisoning is also harmful to the respiratory system. Long-term exposure to formaldehyde It can cause respiratory dysfunction and hepatotoxic lesions, manifested as liver cell damage and abnormal liver radiation energy. So it's always been a fear in people's minds. In recent years, researchers have carried out several studies on ozone treatment, including activated carbon adsorption method, thermal decomposition method, liquid medicine absorption...

AI Technical Summary

Problems solved by technology

The indoor air purifier can remove formaldehyde at the beginning, so its concentration is low; as the use time of the purifier prolongs, the formaldehyde removal rate decreases. Therefore, when the formaldehyde content is higher than the standard content, the color test paper at the ventilation outlet will show color, rather than the currently commercially available color card, the concentration of formaldehyde is certain, the color of the color test paper is determined, and it is irreversible