A kind of detection method of trace small molecule aldehyde in air
A detection method and small molecule technology, applied in the direction of measuring devices, material separation, and analysis of materials, can solve the problems of respiratory tract infection, affecting the yield of butadiene, environmental air pollution, etc., and achieve short analysis time and method linearity Good, high recovery effect
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Embodiment 1
[0034] Preparation of standard stock solutions of acetaldehyde, acrolein, methacrolein and crotonaldehyde (1.0mg / mL):
[0035] Accurately weigh 10.0mg of each standard of acetaldehyde, acrolein, methacrolein and crotonaldehyde into four 10mL volumetric flasks, dissolve with water and dilute to the mark.
[0036] Preparation of mixed standard solution of acetaldehyde, acrolein, methacrolein and crotonaldehyde (10.0mg / L):
[0037] Accurately pipette 1.0mL standard stock solutions of acetaldehyde, acrolein, methacrolein and crotonaldehyde (1.0mg / mL) into a 100mL volumetric flask, dissolve and dilute to the mark with methanol.
[0038] Preparation of Absorbent:
[0039] Accurately weigh 1.0g of phenol reagent (3-methyl-2-benzothiazolone hydrazone hydrochloride, MBTH) in a 1L brown volumetric flask, add water to volume to obtain a 1.0g / L phenol reagent solution, take 1.0 Add 1.0 mL of concentrated hydrochloric acid to 1 mL of phenol reagent solution, and dilute to 1000 mL with wa...
Embodiment 2
[0067] The concentration of the absorption liquid is 0.35 mg / L, the pH is 5, and the preparation method is the same as that in Example 1;
[0068] Sample Collection:
[0069] Use a large-bubble absorption tube equipped with absorption liquid to collect the air sample to be tested for 20 minutes at a flow rate of 1.2 L / min, and filter it with a 0.22 μm water-phase microporous membrane to obtain a filtrate, which is MBTH-aldehyde derivatives mixture.
[0070] Sample determination:
[0071] (1) Liquid phase separation: The collected sample filtrate was subjected to liquid chromatographic separation using an ultra-high performance liquid chromatograph, and the chromatographic column used was Shim-pack XR-ODS II (100mm×2.0mm, 2.5 μm); mobile phase A The phase is water, the phase B is methanol; the gradient elution program is: 0-2min, 35%B-90%B, 2.0-5.50min, 90%B, 5.50-6.5min, 90%B-35%B, 6.50 -7.50 min, 35% B; the elution flow rate is 0.3 mL / min, the injection volume is 5.0 μL, a...
Embodiment 3
[0075] The concentration of the absorption liquid is 0.5mg / L, the pH is 7, and the preparation method is the same as that of Example 1;
[0076] Sample Collection:
[0077] Use a large-bubble absorption tube equipped with absorption liquid to collect the air sample to be tested for 10 minutes at a flow rate of 0.5 L / min, and filter it with a 0.22 μm water-phase microporous membrane to obtain a filtrate, which is MBTH-aldehyde derivatives mixture.
[0078] Sample determination:
[0079] (1) Liquid phase separation: The collected sample filtrate was subjected to liquid chromatographic separation using an ultra-high performance liquid chromatograph, and the chromatographic column used was Shim-pack XR-ODS II (100mm×2.0mm, 2.5 μm); mobile phase A The phase is water, the phase B is methanol; the gradient elution program is: 0-2min, 35%B-90%B, 2.0-5.50min, 90%B, 5.50-6.5min, 90%B-35%B, 6.50 -7.50 min, 35% B; the elution flow rate is 0.3 mL / min, the injection volume is 5.0 μL, and...
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