A few dollars for formaldehyde test paper. However, it is not recommended to use this to measure formaldehyde because it is not accurate at all and has no reference value.
Handheld detectors range from tens to hundreds of yuan. There are many treasures, but it is not recommended to buy this for testing. The reason is the same as the last one, and the result is not accurate at all. Our laboratory bought dozens of different brands and models of hand-held detectors to detect formaldehyde for experiments. In the same room, the readings of the test results in the same location range from 0.04 to 0.58, almost every one is different, and the readings are completely random and have no reference value. It is a waste of money to buy it.
On-the-spot sampling, using a six-in-one instrument for testing, costs 100-200/ point. The so-called six-in-one instrument means that one machine can detect six items, namely formaldehyde, benzene, toluene, xylene, ammonia and TVOC. The price of this machine is 500-3000 yuan. The general formaldehyde detection and treatment companies in Fuzhou all use this machine for door-to-door detection, collecting gas on the spot, and then the machine directly prints a piece of paper on the spot, which shows the test results, but in fact the data detected by this machine is still unreliable. Then why do formaldehyde treatment companies like to use this instrument, because this instrument has a very convenient advantage for the treatment companies, that is, it can adjust the data, that is to say, which range they want to adjust the data to, and which range the data will be when they come to your home for testing, which is why when formaldehyde treatment companies are allowed to do testing, almost all formaldehyde exceeds the standard, and some data exceed the standard. I met a customer, who said that they had asked someone to do the test, and the data was 0.35mg/m3, which was 3.5 times that of formaldehyde. I'm curious about how the people who did the test survived if it really exceeded the standard by 3.5 times! But it is easy to understand. If you don't scare your data beyond the standard, how can they give you in addition to formaldehyde to earn your money?
On-site sampling, sending the samples to a regular laboratory recognized by the state for testing, and issuing a legally binding CMA report at a cost of 200-400 yuan/point. This detection method is the most formal and accurate detection method at present. Based on my 8 years of experience in formaldehyde detection and treatment in Fuzhou market, I strongly recommend you to choose this scheme. Although it is more expensive, the result is reliable and I am not afraid of being fooled. Especially when the formaldehyde in your home exceeds the standard, please ask the formaldehyde treatment company to treat it. After re-inspection and acceptance, they must be required to carry out formal testing and issue a CMA report. Because at the time of initial inspection, if your formaldehyde doesn't exceed the standard at all, they will tell you that it exceeds the standard. If you seek treatment from them, it will cost several thousand yuan at most; However, if the governance re-inspection is completed, your formaldehyde still exceeds the standard, and they can use Liuhe One to give you the test report and directly lower the reading to tell you that it is qualified. This is not a question of money, but the safety of the whole family.
What I said above is the cost of one point. Generally, one point is charged for a room, but I suggest that if CMA testing is selected, it can be selectively tested because of the high cost. For example, the materials used in the decoration of the two rooms are almost the same, so choose one room to test it, because the results are definitely similar, which can save some expenses. Of course, if the money is not bad, you can take the exam.
Regarding the second question, how much formaldehyde content is suitable for occupancy? Let's first look at the Indoor Air Quality Standard (GB/T 18883-2002) issued by AQSIQ, Ministry of Health and State Environmental Protection Administration. This standard is applicable to houses and buildings, and is formulated to protect human health. It is the lowest standard for the health of human settlements and the fundamental basis for measuring whether houses are environmentally friendly.
As can be seen from the above standards, the normal value of formaldehyde is 0. 10mg/m3, but as an old engineer, I suggest that our families in Fuzhou, especially those with children and the elderly, should have a formaldehyde concentration of at least 0.08mg/m3 in order to live safely, because children are much weaker than us adults and need more care.
Finally, I would like to remind you that it is really important to detect the concentration of harmful gases such as formaldehyde before moving in after the renovation of the new house. It is more important to find a professional and reliable company to test!