Method for determining methanol in exhaust gas of solid pollution source

A measurement method and technology of pollution sources, applied in the field of methanol measurement in solid pollution source exhaust, can solve the problems of increased column damage, high price, column damage, etc., to ensure accuracy, precision and accuracy, and usage Reduced effect

Inactive Publication Date: 2019-11-22
南通化学环境监测站有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If you can’t find the right conditions, the peak will not come out or the peak will be incomplete, which will affect the accuracy of the detection data
[0003] For many items detected by gas chromatography, according to the standard requirements, different items require different chromatographic columns, so frequent replacement of chromatographic columns leads to increased risk of column damage
A chromatographic column is very expensive (a capillary is about 3,000 yuan a piece), and frequent replacement of the column can easily cause damage to the column, and it is time-consuming

Method used

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  • Method for determining methanol in exhaust gas of solid pollution source
  • Method for determining methanol in exhaust gas of solid pollution source

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The detection method for the determination of methanol in the exhaust gas of solid pollution sources by gas chromatography:

[0022] 1. Instrument

[0023] a) Sampling instruments for organized emission monitoring: refer to 9.3 in GB16157-1996 to configure the sampling system.

[0024] b) Sampling tube: use stainless steel, hard glass or polytetrafluoroethylene tube material of appropriate size, and attach an insulation jacket that can be heated to above 120 °C.

[0025] c) Sampling device: 100ml full glass syringe.

[0026] d) Flow metering device: refer to 9.3.6 in GB16157-1996.

[0027] e) Suction pump: refer to 9.3.7 in GB16157-1996.

[0028] f) Connecting pipe: Teflon hose or silicone rubber tube lined with Teflon film.

[0029] g) Sampling instrument for fugitive emission monitoring: 100ml full glass syringe.

[0030] h) Air storage bag: aluminum foil composite film air bag.

[0031] i) Syringe, 1.0 ml.

[0032] j) Gas chromatograph: Tianmei 7900II.

[003...

Embodiment 2

[0071] Precision test experiment of the present invention:

[0072] Draw 5.0ml of the above 7.918*10 -4 Four parts of standard gas of ug / ml are entered in four 100mL syringes, respectively labeled 1, 2, 3 and 4, and the sample concentration is measured by the sample determination method of Example 1, and the results are as follows:

[0073]

[0074] After calculation, the average concentration of methanol is 40.4μg / l, and the results of the sample show that the precision test of methanol meets the requirements of the standard.

Embodiment 3

[0076] Addition recovery experiment: draw 10.0ml of methanol respectively, the concentration is 7.918*10 -4 ug / l standard gas is in the 100ml syringe of embodiment 2, and respective standard addition recoveries are shown in the table below:

[0077]

[0078] Has been calculated:

[0079] The recovery rate of sample 1 spiked: 92.9%; the recovery rate of sample 2 spiked: 94.8%;

[0080] The spiked recovery rate of sample 3: 93.7%; the spiked recovery rate of sample 4: 93.3%.

[0081] The determination of methanol in exhaust gas from solid pollution sources is analyzed by packed column in the current national standard method. According to the requirements of the standard, different projects require the use of different chromatographic columns, and the usage rate of the packed column required by the standard is low. Except for the determination of methanol, few other projects use this chromatographic column. The price of a chromatographic column is very expensive (packed colu...

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Abstract

The invention discloses a method for determining methanol in exhaust gas of a solid pollution source. The method comprises the following steps including sample collection, sample treatment, standard gas preparation, standard curve making and determining. Sample collection further comprises organized sampling, unorganized sampling and blank sample sampling. According to sample treatment, sample gasstored in an aluminum foil bag or a 100ml syringe is taken by a 1ml syringe, replacement is repeated for three times, and 1.0 ml of sample gas is taken for analysis. According to the determining step, the gas phase conditions of a gas chromatograph are set as that a 30m * 0.50 mm * 1.0 mu m PEG-20M capillary chromatographic column is adopted, the column temperature is 70 DEG C, the temperature of a vaporizing chamber is 200 DEG C, the temperature of a detection chamber is 230 DEG C, and the carrier gas flow is 10ml / min. The method can be used to obtain an accurate detection result of the methanol compounds in the exhaust of the solid pollution source, meets the national requirements, and is time-saving and efficient.

Description

technical field [0001] The invention relates to a method for measuring methanol in exhaust gas from solid pollution sources, belonging to the field of chemical detection of compounds. Background technique [0002] For the determination of toxic substances in ambient air, the detection method of methanol in the exhaust gas of solid pollution sources is generally gas chromatography, and the national standard requires the determination of methanol in the exhaust gas of solid pollution sources to be 2m×2~3mm glass (or stainless steel) packed column , Chromatographic column packing: 5% Carbowax 20M Carbopack B 80-120 mesh, column temperature: 70 degrees; vaporization chamber temperature: 200 degrees; detection chamber temperature: 230 degrees; carrier gas (nitrogen) flow rate: 32ml / min. Similarly, gas chromatography can also be used in the determination of other types of ambient air toxic substances. The core technology is to select and use appropriate chromatographic columns and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02G01N30/06G01N30/04G01N30/86G01N30/60G01N30/30G01N30/32
CPCG01N30/02G01N30/04G01N30/06G01N30/30G01N30/32G01N30/6052G01N30/8634G01N2030/042G01N2030/324
Inventor 李海霞葛云
Owner 南通化学环境监测站有限公司
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