Oxalaldehyde or methylglyoxal standard gas generation device and method
A technology of methylglyoxal and standard gas, which is applied in measuring devices, sampling, instruments, etc., can solve the problem of inability to calibrate glyoxal and methylglyoxal measuring instruments, limit glyoxal and methylglyoxal Measurement accuracy and other issues, to achieve the effect of accurate and reliable gas concentration, rigorous method, and small fluctuation range of gas concentration
Pending Publication Date: 2018-12-07
PEKING UNIV
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Problems solved by technology
Because glyoxal and methylglyoxal pure substances are very easy to form hydrates with water vapor in the air, there is no standard gas of glyoxal and methylglyoxal in the prior art, and it is impossible to treat glyoxal and methylglyoxal Measuring instruments for methylglyoxal are calibrated, which limits the measurement accuracy of glyoxal and methylglyoxal
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[0030] Below in conjunction with accompanying drawing, further describe the present invention through embodiment, but do not limit the scope of the present invention in any way.
[0031] The glyoxal or methylglyoxal standard gas generator that present embodiment provides, as figure 1 As shown, it includes a nitrogen cylinder 1, a mass flow controller 2, a U-shaped tube 5, a cryogenic cold trap 7, a mixing chamber 13 and a cavity-enhanced absorption photometer 14, wherein: at the bottom of the U-shaped tube 5, there is a ethylene dioxide at the center. Aldehyde or methylglyoxal pure substance 6, the whole U-shaped tube 5 is placed in the cryogenic cold trap 7 to preserve; the two ends of the U-shaped tube 5 are respectively connected with the main pipeline through a three-way valve; The gas outlets are respectively connected to the main pipeline through three-way valves. The outlet of the nitrogen cylinder 1 is connected to the mass flow control meter 2, and the mass flow cont...
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The invention discloses an oxalaldehyde or methylglyoxal standard gas generation device and method. The device comprises a nitrogen cylinder, a mass flow controller, a U-shaped pipe, a cryotrap, a mixing chamber, a cavity enhanced absorption photometer and a gas pipeline, wherein high-purity nitrogen in the nitrogen cylinder enters the gas pipeline via the mass flow controller, and the U-shaped pipe, the mixing chamber and the cavity enhanced absorption photometer are connected in sequence on the gas pipeline by virtue of three-way valves; and the U-shaped pipe is arranged in the cryotrap, andpure oxalaldehyde or methylglyoxal is filled in the bottom center of the U-shaped pipe. The method comprises the following steps: eluting the oxalaldehyde or methylglyoxal in the U-shaped pipe in thecryotrap into the mixing chamber with the high-purity nitrogen, diluting, uniformly mixing, and entering the cavity enhanced absorption photometer for performing accurate quantification. The device disclosed by the invention is capable of continuously supplying the oxalaldehyde or methylglyoxal standard gas for a long time, is accurate and reliable in gas concentration and small in fluctuation range, and has the characteristics of high stability, high flexibility and wide application range.
Description
technical field [0001] The invention relates to the field of environmental monitoring, in particular to the field of atmospheric measurement, in particular to a glyoxal and methylglyoxal standard gas generating device and method. Background technique [0002] Glyoxal and methylglyoxal are typical atmospheric oxidation intermediate species, and their sources and removal pathways are crucial for clarifying atmospheric hydroxyl radicals (HOx=OH+HO 2 ) plays an important role in the recycling mechanism, and HOx free radicals are the key to explain the complex pollution of the atmosphere, so the real-time and accurate quantification of the concentration of glyoxal and methylglyoxal in the atmosphere has important scientific significance. [0003] At present, the measurement methods of glyoxal and methylglyoxal can be divided into liquid-phase chemical method, mass spectrometry and spectroscopic method according to the principle, among which liquid-phase chemical method and mass s...
Claims
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Login to View More IPC IPC(8): G01N21/31G01N21/01G01N1/28G01N1/38
CPCG01N1/28G01N1/38G01N21/01G01N21/31G01N2001/2893G01N2001/386G01N2021/0112
Inventor 刘靖崴李歆何圣贵杨奕鸣刘清宇卢雪伟
Owner PEKING UNIV