The newly purchased office furniture in Foshan will have more or less formaldehyde. Although formaldehyde is colorless and odorless, it is harmful to human health. When the concentration of formaldehyde is relatively low, it will irritate the eyes and mucous membranes, and the eyes will be uncomfortable; when the concentration is relatively high, it will stimulate the upper respiratory tract and cause respiratory edema, causing coughing, difficulty breathing, headache, and nausea. So how to detect the formaldehyde content of office furniture in Foshan? The following Guangzhou office furniture manufacturers introduce several methods for detecting formaldehyde content.
Dryer method: The first step is to collect formaldehyde from the conference table-place a crystallized dish containing distilled water at the bottom of the dryer, and place a sample on the metal bracket fixed above it. The released formaldehyde is absorbed by the distilled water as the sample solution. Step 2: Determine the formaldehyde concentration in the file cabinet-use a spectrophotometer to measure the absorbance of the sample solution, and obtain the formaldehyde concentration from the standard curve drawn in advance.
Climatic chamber method: Put the test pieces of known surface area into a test chamber whose temperature, relative humidity, air flow rate and air replacement rate are controlled to a certain value. Formaldehyde is released from the test piece, mixed with the air in the box, and the air in the box is periodically extracted. The air is drawn from the box and the concentration of formaldehyde absorbed by the water is measured by a gas scrubber filled with water. The formaldehyde concentration of the air in the test box is calculated from the formaldehyde concentration of the water in the scrubber bottle and the volume of air drawn, expressed in (mg / m3). Sampling is periodic until the concentration of formaldehyde in the test chamber reaches equilibrium.
Extraction method: The first step is perforated extraction-free formaldehyde is completely separated from the plate of the workbench. It is divided into two processes. Liquid-solid extraction causes formaldehyde to be dissolved out of the plate, and then formaldehyde-dissolved toluene is subjected to liquid-liquid extraction through a perforator and water to dissolve the formaldehyde in water. The second step: photometric determination of formaldehyde content.