Analyze the product characteristics and measurement mode of the formaldehyde detector
The formaldehyde detector realizes on-site semi-quantitative realization of formaldehyde in indoor air, characterized by simple structure, small size, easy to carry and intuitive. It can be widely used for on-site quantitative and qualitative detection of formaldehyde in the air in living rooms, indoors, residential areas, public places, living places and factories and mines. The portable indoor air formaldehyde on-site detector is designed according to the principle of GB/T 18204.2-2014 "Public Health Inspection Methods for Part 2: Chemical Contaminants".
working principle
The formaldehyde detection instrument adopts the principle of high-sensitivity electrochemical sensor. Combined with single-chip technology and network communication technology, the air sample is collected at the detection site. The formaldehyde in the air is absorbed by the phenol reagent solution, and the reaction produces a azine. The azine is used in the acidic solution to be a high-iron ion of the color developer. Oxidation forms a blue-green compound. Direct colorimetric determination at the scene based on color depth.
Since the detection value of indoor pollution has a great relationship with the temperature, humidity, and pressure of the detection environment, according to the normal detection, the detected value often deviates from the expected one.
The machine on the right picture is a five-in-one detector, which can quickly detect indoor formaldehyde, benzene, ammonia, toluene, xylene, TVOC and other polluting gases. It can display the date, detection time, and test the temperature and humidity data on the site. The LCD screen is displayed for Chinese, the sampling operation is on the right side, and the thermal printer is in the middle. It can quickly sample and analyze in real time, and can print the date and time, temperature, humidity and execution standard, formaldehyde content and whether it is qualified to be printed. The formaldehyde detection adopts the national standard phenol reagent spectrophotometry, and the imported photoelectric sensor has high detection precision and low detection limit. It solves the problem that the zero point of the electrochemical formaldehyde detector sensor is easy to drift and is easily interfered by other chemical gases during sampling.
Precautions
1. The test water must be distilled water deionized water or purified water.
2. Bubble absorption bottle and do not connect to the air inlet hole, otherwise it will produce reverse suction, damage the instrument and loss of absorption liquid.
3. All glassware should be cleaned with acid wash, tap water and distilled water in the chemical laboratory before the first use.
4. After each test, the bubble should absorb the colored solution in the bottle in time, and then clean it with acid washing solution, tap water and distilled water.
Testing supplies
Formaldehyde detection reagent, used together with air detection equipment, can detect the concentration of various gases in more than 10 minutes
Product qualification
The indoor air detector formaldehyde detection reagent is designed according to the national standard GB/T 18204.2-2014 "Public Site Health Inspection Method Part 2: Chemical Contaminants" principle, which has been configured as a standard reagent and can be used directly.
The instrument can detect six pollution indexes of formaldehyde, benzene, ammonia, toluene, xylene and TVOC in indoor air, and can test 6 items at the same time. It can be widely used in environmental protection, construction, decoration, supervision and other companies to carry out indoor air quality testing business, and can also be used for daily research and teaching activities of research institutes.
Features
It is not affected by extreme high temperature and humidity environment and has humidity compensation function. Formaldehyde readings are displayed in ppm or mg/m3 units. One-button operation, fast sampling, and fast recovery time. The standard configuration includes a formaldehyde calibration source (valid for half a year) and the calibration procedure can be completed in just a few seconds. A 10 phenol filter is included to eliminate the effect of phenol on the reading. The optional computer remote control software and adapter make the formaldehyde detector a wireless monitoring system. Users can also choose the basic data processing device to print data in real time.
Product Categories
Common testers on the market are broadly classified into the following categories:
1. Using the probe for testing, the representative instrument has XP-308, 4160, PPM400, etc. It features direct data reading and convenient carrying. The disadvantage is that it is greatly affected by temperature and humidity. It needs to be calibrated with standard gas, and the daily maintenance cost is low. Usually replaced in 1 year, and the price needs several thousand dollars.
2. Analytical readings by spectrophotometry, there are Japanese Riken FP-30, domestic Ji-size swan, the former uses finished tablets, the instrument is small in size, direct reading after 15 to 30 minutes of sampling, the accuracy can reach 0.005PPM, the maintenance cost is The price of the tablets is about 17 yuan / piece, and the machine does not need maintenance at all. The relative operation of the little swan is more complicated. The steps required after 15 minutes of sampling are cumbersome and the precision can be 0.01. The characteristics of this type of instrument are also more prominent. The precision is high and accurate, the influence of interference gas is small, and the temperature and humidity are compensated.
3. The hand-held formaldehyde detector is a hand-held meter that can continuously measure formaldehyde. This product is suitable for places with formaldehyde such as environmental monitoring, industrial production, and chemical industry.
4. The portable formaldehyde detector can be zeroed at the site to be tested without the need for outdoor air. It is applied to indoor formaldehyde gas detection in public places, formaldehyde gas detection in civil buildings, and formaldehyde content detection in building materials.
Research status
In analytical chemistry, spectral analysis still occupies an important position, and the spectrophotometric method for formaldehyde determination is retained in national standard methods in many countries. Fifteen laboratories in three regions of the United States, Europe and Japan have consistently recommended the use of phenol reagents to detect formaldehyde levels in vaccines. In many field applications of practical applications, photometry is still a reliable, simple and economical method. Spectrophotometry or its improved method still plays an important role in formaldehyde monitoring methods. The new method of high sensitivity, good selectivity and continuous real-time monitoring in the field is the direction of its efforts. [1]
The application of chromatographic techniques in formaldehyde monitoring will continue to grow with its own development. In a long time, chromatographic methods are still the most effective means to solve the simultaneous separation and analysis of complex components. On the instrument side, on-site analytical instruments will undoubtedly dominate. It is the most representative direction in the development of formaldehyde monitoring instruments. However, this does not mean that the laboratory's formaldehyde measuring instrument equipment will withdraw from the historical stage. In short, the development of new methods and new instruments with high sensitivity, good selectivity and on-site analysis or long-term stable real-time online monitoring will be an important direction for formaldehyde monitoring in the air.
Measurement mode
Direct measurement
Single measurement of the sensor box inserted into the host unit
The main unit is inserted into the sensor box for a 30 minute or 1 hour test in direct measurement mode (longer sampling times provide slightly better results).
Features: Easy to operate, but only one measurement point can be performed per test, which takes a long time.
Sampling measurement
The sensor box is used as a passive sampler and the test results are read by the host unit.
The sensor itself can be used as a passive sampler. No fans or pumps are needed. The change in relative colorimetric absorbance occurring in the sensor is read by the host unit before and after sampling and converted to formaldehyde concentration.
Features: It can perform multi-point detection at the same time with high efficiency. However, multiple sensor boxes must be used at the same time.
Continuous measurement
The main unit is inserted into the sensor box for continuous long-term monitoring of the concentration of formaldehyde gas.
The host unit reads the change in absorbance every 30 minutes and stores it for continuous reading (or until the sensor reaches saturation).
Features: Long-term continuous monitoring, multiple continuous monitoring values ​​can be obtained at the same measuring point, and the change of formaldehyde gas concentration in the time period is obtained. In order to perform multi-point continuous monitoring at the same time, multiple hosts and sensor boxes must be equipped at the same time.
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