Efficient collection and rapid mass spectrometry method for organic compounds in atmosphere
A technology for organic compound and mass spectrometry analysis, which is applied in the field of efficient collection of organic compounds in the atmosphere and rapid mass spectrometry analysis. The effect of controllable quantity, high analytical sensitivity and low price
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Embodiment 1
[0030] refer to figure 1 , the steps of this embodiment include:
[0031] Step 1. Accurately weigh 0.5g of silicon dioxide with a particle size of 10μm and 0.05g of corn starch and dissolve them in 100mL of deionized water. After ultrasonic emulsification for 20 minutes, heat it to boiling and keep it for 0.5 minutes; Load it in a vacuum filtration device containing blank filter paper, carry out suction filtration and coating, after the aqueous solution completely permeates the filter paper, wash with 10mL of absolute ethanol, and then dry it in a fume hood to obtain silica adsorbent-loaded paper matrix (such as figure 2 A).
[0032] Step 2, the prepared paper matrix is used as an atmospheric sampling filter, placed in a high negative pressure ambient air particle sampler (the resistance to overcome is 20kPa when the maximum load is 50L / min), and the organic compounds and aerosol particles in the atmosphere are collected. The sampling flow rate is 30L / min. After the samp...
Embodiment 2
[0036] The preparation method was the same as in Example 1, except that 0.1g-0.9g of commercially purchased silica with a particle size of 10 μm was accurately weighed for the preparation of silica-loaded paper substrates, the collection of organic compounds in the atmosphere, and mass spectrometry analysis.
[0037] Performance comparison: By comparing the performance of paper substrates loaded with different amounts of silica, it can be found that when the surface of the paper substrate does not contain any silica, its enrichment efficiency for siloxane compounds (m / z 536, 610 and 684) in the atmosphere lower ( Figure 4 A); when 0.1g of silica is loaded on the surface of the paper substrate, its enrichment efficiency is significantly improved ( Figure 4 B); when the loaded amount of silicon dioxide reached 0.3g, its enrichment efficiency to the siloxane compound in the air gradually increased ( Figure 4 C); when the loaded amount of silicon dioxide was further increased ...
Embodiment 3
[0039] The preparation method is the same as in Example 1, except that 0.5 g of commercially purchased silica with a particle size of 1 μm-80 μm is accurately weighed for the preparation of silica-loaded paper substrates, the collection of organic compounds in the atmosphere, and mass spectrometry analysis.
[0040] Performance comparison: By comparing the performance of silica paper substrates loaded with different particle sizes, it can be found that when the particle size of silica is between 1 μm and 80 μm, its enrichment efficiency for siloxane compounds in the atmosphere is basically similar ( Figure 5 ). Nevertheless, during the sampling process, it was found that when the particle size of silica was small, the back pressure of the sampler was large (>20kPa, close to the limit value of the instrument), and the sampling volume was small; When the sample volume becomes stable, the backpressure drop of the sampler is about -13kPa; when the particle size of silica is furth...
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