Method for collecting and detecting aerosol in side-stream smoke applicable to cigarettes having different concentrations of tar
A sidestream smoke and detection method technology, applied in the preparation of test samples, measuring devices, particle size analysis, etc., can solve the problems of complex changes in the ambient air flow at the collection end, no detection system, and inability to meet the detection results. Sensitive and reliable, saving financial and material resources, reasonable pipeline setting effect
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Examples
Embodiment 1
[0045] Detection of high tar concentration cigarette sidestream smoke in this system.
[0046] (1) Cigarette samples with a tar content of 24 mg / stick (high concentration) are sucked in a smoke generating device, and the generated sidestream smoke has a cross-sectional area of 10 cm × 2 cm = 20 cm 2 The fish tail hoods are collected to form a sample flow 1;
[0047] (2) The sample flow 1 is divided into two branches by the bifurcated pipeline, and one branch is connected to the auxiliary suction source 1 for the first-stage split flow to form the sample flow 2. The flow rate of the sample flow 2 is adjusted to 22L / min.
[0048] (3) Another branch of sample flow 1 forms sample flow 3, which forms sample flow 4 after passing through the gas mixing diluter. The diluter is also connected with a clean compressed air source and an exhaust device connected to a pressure regulating valve. The intake flow rate of the clean compressed air of the mixing diluter is 60L / min, and the e...
Embodiment 2
[0053] Detection of low tar concentration cigarette sidestream smoke in this system.
[0054] (1) Cigarette samples with a tar content of 2 mg / stick (low concentration) are smoked in a smoke generating device, and the generated sidestream smoke has a cross-sectional area of 10 cm × 2 cm = 20 cm 2 The fish tail hoods are collected to form a sample flow 1;
[0055] (2) The sample flow 1 is divided into two branches by the bifurcated pipeline, and one branch is connected to the auxiliary suction source 1 for the first-stage split flow to form the sample flow 2. The flow rate of the sample flow 2 is adjusted to 20L / min.
[0056] (3) Another branch of sample flow 1 forms sample flow 3, which forms sample flow 4 after passing through the gas mixing diluter. The diluter is also connected with a clean compressed air source and an exhaust device connected to a pressure regulating valve. The intake flow rate of the clean compressed air of the mixing diluter is 8L / min, and the exhau...
Embodiment 3
[0060] The cigarette sidestream captured by the fishtail hood is directly detected:
[0061] A cigarette sample with a tar content of 24 mg / stick is smoked in a smoke generating device, and the resulting side The flue gas is collected with a fishtail hood to form a sample flow, which is detected by an aerosol detector with a working efficiency of 10L / min.
[0062] At this time, the ambient air flow rate of the cigarette sample test was 85mm / s, which did not meet the requirements of the cigarette test standard. At the same time, the aerosol test results are attached Figure 5 As shown, the detection results of aerosol particles with several diameters exceeded the detection limit of the instrument (4.0×10 5 fA), if there is no difference between the detected values, the detection and analysis cannot be carried out.
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