Active-carbon-fiber type solid-phase adsorption method for gas-phase chromatogram
A technology of activated carbon fiber and gas chromatography, which is applied in the field of analytical chemistry, can solve the problems of short service life, complicated production, long equilibration time, etc., and achieve the effects of long service life, convenient manufacture and high sensitivity
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Embodiment 1
[0016] Knead 15% of pitch, 70% of coke powder and 15% of kaolin at 200°C, press them at 350°C, and then put them in a tube furnace under N 2 Under the atmosphere, after carbonization at 1000°C, pass in water vapor for 20 minutes, and after cooling, activated carbon fibers will be obtained, which will be made into the required size and assembled into a solid-phase micro-adsorption device. The methanol in the mousse was analyzed, and the results are shown in Table 1. Using commercially available polyacrylate SPEM, only the huge solvent peak in the mousse and no methanol peak appeared, and the methanol peak in 1ml headspace was also hidden by the impurity peak. In contrast, ACF showed a good Selectivity, it reduces the impurity peaks by tens to hundreds of times, and concentrates the methanol peak.
[0017] Table 1 Determination results of methanol in mousse by ACF-SPMA method
[0018] Manufacturer's name
Embodiment 2
[0020] On the quartz wire with φ = 125 μm, apply phenolic resin with a weight ratio of 40% and a polymerization degree of 50% by dipping method. After each immersion, dry the quartz wire with a hot hair dryer and fully polymerize the resin layer. Repeat this process. The resin layer is gradually thickened to 75 μm. Make this fiber in quartz tube furnace, under coal gas atmosphere, install after carbonization, activation as the operation of embodiment 1, obtain coating type ACF, and compare with the SPMA of the body type ACF in embodiment 1, in gas chromatography Benzene was analyzed above, and the results were as follows figure 1 shown.
[0021] From figure 1 The comparison of the adsorption efficiency of the two ACF fibers shows that the two fibers basically reach equilibrium within 30 seconds, but the adsorption capacity of the body-shaped fiber is 3.3 times that of the coated fiber. Moreover, the quartz wire of the coated fiber is easy to break during operation, and the ...
Embodiment 3
[0023] With 12% phenolic resin (polymerization degree as embodiment 2), 65% graphite powder and 23% montmorillonite powder as raw material, according to embodiment 1, make SPMA device, and measure the benzene industrial waste water with gas chromatography The perchlorethylene, and compared with GB (straight pumping headspace method). The results are shown in Table 2 and Table 3. This fiber has been used more than 300 times, and the adsorption performance has not changed significantly.
[0024] Table 2 Determination results of PCE wastewater samples by SPME method and GB method
[0025] Concentration (mg / L)
SPME method
GB method
0.5
10295
5290
1
23377
13167
2
53333
23906
3
70561
37432
4
85123
44976
Sample to be tested
65931
33168
Sample to be tested +0.5
75197
38095
[0026] SPME method: Y=3024.5+21673*X (R=0.988)
[0027] GB method (direct injecti...
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