How to do the VOC bag method odour test?
I believe that many people do not understand what kind of test the VOC bag method is. VOC testing is one of the lesser seen testing methods, so here's how to do VOC bag method odour testing.[ VOC bag method odour test chamber]
The VOC bag method of odour detection specification provides for the use of the bag method of sampling and testing volatile organic compounds ((VOCs) in the vehicle component assembly. The relevant standards also explain this, such as ISO/FDIS 12219.1-2012, HJ/T 400-2007, SVW VW PV3938, German VOC testing standards VDA276, VDA277/PV3341, DIN:13130-4, VDA278, etc.
The principle of the VOC bag method is to simulate the use of the sample in the car, put the sample into a sealed bag, flush in the appropriate amount of nitrogen, heating, VOC gas emission, using Tenax tube adsorption of benzene via substances, detected by ATD-GC-MS; DNPH tube adsorption of aldehydes and ketones, elution after detection by HPLC.
The steps of the VOC bag method of detection are as follows.[ VOC bag method odour test chamber]
1. Place the sample of the material to be tested into the bag as shown below. Connect the Teflon line, the sampling tube (DNPH packing for aldehydes and ketones, Tenax packing for benzene and hydrocarbon organic components) and the sampling pump to the bag.
2. Seal the sampling bag and extract the air, fill it with 5L of nitrogen and then extract it, thus repeating the nitrogen replacement 3 times after the constant temperature heating.
3. Heat up to 40°C or 60°C within 0.5~2h (60°C for the instrument panel and rear partition, 40°C for other parts).
4. Hold the gas sample separately after 2.0h of insulation (note: the 100mL of gas drawn first will not be measured).
Today's VOC bag method odour detection will be introduced to you, if you want to know more about the bag method detection of the relevant steps, equipment, methods, etc., please feel free to consult the environmental instruments.
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