Box for rapidly determining formaldehyde in indoor air, and passive absorption manufacturing method

Abstract

The invention discloses a box for rapidly determining formaldehyde in indoor air, and a passive absorption manufacturing method, and belongs to the field of detection instruments. The invention aims to provide the box for rapidly determining the formaldehyde in the indoor air, and the passive absorption manufacturing method; and by the box, the formaldehyde in the indoor air is rapidly determined according to the principle that gas molecules are permeated and absorbed after being dispersed. The method comprises the following steps of: placing sodium metabisulfite in a beaker, adding purified water, stirring and dissolving, then adding glycerol, adding purified water, stirring, and completely dissolving to obtain a formaldehyde absorbent; injecting the formaldehyde absorbent into the bottom of a plastic formaldehyde absorption box by using a liquid-moving machine, placing the plastic formaldehyde absorption box in a drying oven at constant temperature of 100 DEG C, taking out after 13 minutes, forming a film with the thickness of 1 to 2mu m by using the formaldehyde absorbent, covering an upper cover of the plastic formaldehyde absorption box, and preserving at room temperature; placing the plastic absorption box at any horizontal position in a room to be detected, opening the plastic sealed upper cover, injecting an aqueous solution, slightly stirring for 5 seconds to ensure that the absorbent film in the formaldehyde absorption box is dissolved, standing for 30 minutes, adding a color-developing agent, stirring for 3 seconds, absorbing absorption liquid into a color comparison tube, holding the liquid part of the color comparison tube by using a hand for 5 minutes, comparing the color of the absorption liquid and the color of a standard color separation guide, and reading the content of formaldehyde in indoor air. The formaldehyde absorbent is not needed to be crushed, so the manufacturing process is simple.

Description

technical field [0001] The invention belongs to the field of detection instruments. Background technique [0002] A large number of formaldehyde self-testing boxes in indoor air have been launched at home and abroad, such as 3M, Mitsubishi and DuPont of the United States. Domestic products for liquid absorption of formaldehyde in the air, such as Changchun Jida Little Swan Instrument Co., Ltd., Beijing Science and Technology Co., Ltd. Ring Co., Ltd., etc. However, the detection method of these products is to mix the solid reagents and auxiliary reagents that absorb formaldehyde, weigh them, and pack them in absorption boxes. When using them, add liquid solutions to dissolve them and place them in the room to be tested. Then add a color developer to react with formaldehyde in the absorption solution to develop color, compare the color solution with the standard formaldehyde color scale card, and read the formaldehyde content in the indoor air. Their production process is ge...

AI Technical Summary

Problems solved by technology

Due to the use of mechanical equipment for mixing, uneven mixing is inevitable

This will lead to poor consistency of the test reagents and bias the test results.

Due to existing technical reasons, auxiliary reagents need to be added when the balance is weighed and packaged, which complicates the production process

Moreover, the addition of auxiliary reagents will produce a salt effect, which will cause the solution to affect the absorption of formaldehyde, slow down the absorption and reaction speed, and prolong the detection time

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