A method for detecting solvent gasoline in the air of workplaces

Abstract

The invention discloses a detection method for solvent gasoline in air in a working place, and relates to the technical field of solvent gasoline detection. The method comprises the following steps of collecting an air sample by using an activated carbon tube, collecting a blank air sample by using a blank sample collector, and delivering the samples to a laboratory for storage; preparing a desorption solution; pouring activated carbon in the activated carbon tube into a solvent desorption bottle, adding the desorption solution into the solvent desorption bottle, and taking the upper desorption solution as a detection solution; debugging a gas chromatograph, and setting a temperature raising program, wherein a bonded and cross-linked chromatographic column is adopted as a gas chromatographic column; preparing a standard solution by adopting carbon disulfide; injecting the upper desorption solution into the gas chromatograph for detection, wherein the injection volume of the desorption solution is 0.5 or 10 microlitres; and quantitatively analyzing a detection result to obtain the concentration of the solvent gasoline in air. According to the detection method, a process is simple, the result is accurate, the method is wide in application range and short in detection time, and the solvent gasoline in air in the working place can be timely detected.

Description

technical field [0001] The invention relates to the technical field of solvent gasoline detection, in particular to a method for detecting solvent gasoline in the air of a workplace. Background technique [0002] Gasoline, diesel and other oil products will volatilize and leak during production, storage, transportation, sales, etc., and form chemical harmful factors in the form of oil and gas in the air of the workplace. In addition to causing material loss, it will also affect the occupational health of workers. To form a certain hazard, it is necessary to detect the concentration of oil and gas in the air of the workplace. According to the current GBZ2.1-2007 "Occupational Exposure Limits of Hazardous Factors in the Workplace Part 1: Chemical Hazardous Factors", there is currently no occupational exposure limit for harmful factors mainly including volatile gases of gasoline, diesel and other oil products , At present, domestic research generally selects the limit value of...

AI Technical Summary

Problems solved by technology

[0004] (1) Direct sampling - gas chromatography uses air bags to collect air samples and then returns them to the laboratory for analysis by gas chromatography. However, the sample storage time is only 8 hours, and it is not suitable for long-term sampling of individuals

[0005] (2) The thermal desorption method uses activated carbon tubes to collect air samples, and after taking them back to the laboratory, the activated carbon tubes after sampling are processed with thermal desorption methods, and a certain volume of the desorbed gas samples is injected into the gas chromatograph for analysis. The operation is cumbersome, and the automatic desorption and injection of batch samples cannot be realized. Moreover, the thermal desorption process of activated carbon has the disadvantages of low desorption efficiency and poor repeatability due to the characteristics of activated carbon itself.

[0006] (3) Chen Huayi's "Determination of Solvent Gasoline in Workplace Air by Solvent Desorption Gas Chromatography" uses capillary gas chromatography to measure solvent gasoline in workplace air, but the HP-FFAP column used in this method is nitro-p-benzene Diformic acid-modified polyethylene glycol column, which is highly polar, is not the best choice for the separation of solvent naphtha components, which are mainly non-polar

At the same time, this method only uses a constant temperature procedure, and it is difficult to ensure that all components of solvent gasoline, especially macromolecular components, peak before solvent carbon disulfide

[0007] (4) Li Yongqin also used capillary gas chromatography to detect liquefied petroleum gas in the article "Determination of liquefied petroleum gas in the air by solvent desorption gas chromatography", but the chromatographic column used in this article is HP-101 non-polar column , the stationary phase of the column is 100% dimethylpolysiloxane, which is a non-crosslinked column, not durable, has a short life, and cannot be cleaned with solvents

[0009] To sum up, the existing detection methods for solvent gasoline in the workplace air have the defects of low efficiency of activated carbon tube thermal desorption, unstable thermal desorption efficiency, cumbersome thermal desorption operation, and inability to realize automatic desorption of batch samples.