Indoor formaldehyde detection, the on-site detection process is like this

Pollution is inevitable during the decoration process, especially formaldehyde which is extremely harmful to the human body and must be completely removed before moving in. To detect whether there is still formaldehyde remaining in the room, the process is very simple. First, take samples, then decompose them through instruments, and finally read the data.

1. Sampling: The sampling instrument generally used is an indoor air sampler, which has the advantages of being able to sample multiple pollutants at the same time and being easy to carry. It is currently the most widely used sampler. The general process of sampling is:

1) Select a suitable monitoring point in the detection area, and place the detection instrument at the concentration point of the pollution source. The air sampler inlet should be 1.0 meter away from the pollution source and 1.2 meters high. Unpack the detector, install and connect the instrument pipeline, and then turn on the power.

2) Take out the phenol reagent and water solution, open the package and bottle cap, pour the water solution into the phenol reagent bottle, and shake well for 20 seconds.

3) Pour the shaken reagent into the bubble bottle. Set the detection gas path and time (usually 10 minutes). Select the test gas path and set the time (10 minutes). Start sampling.

4) Press the detection button, adjust the air flow sampler to 1000ml and the time to 10 minutes to start air sampling.

5) After sampling, pour the color developing solution into the bubble bottle, let it stand for 10 minutes (no need to hold it), then pour the colored liquid into a 5ml U-shaped glass color developing tube and label it.

2. Reading: Bring the collected samples back to the laboratory for reading. The formaldehyde sampling wind photometer reads the data. Before reading, you must first prepare a series of formaldehyde solutions of known concentrations and measure their absorbance A at a fixed wavelength. Draw a curve with formaldehyde content as the horizontal axis and absorbance as the vertical axis, and calculate the regression curve. The absorbance of the sample is then measured at the same wavelength, and the formaldehyde concentration is calculated from the curve.