Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for detecting benzene series pollutants in gas by using internal standard method

A technology for detecting benzene-based pollutants and gases, which is applied in the field of benzene-based pollutants and can solve problems such as response value drift and inaccurate analysis results

Active Publication Date: 2015-05-13
SHANGHAI KINGFA SCI & TECH
View PDF3 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] What the present invention is to solve is to detect the benzene series pollutants in the indoor air and the gas in the passenger car. When using the external standard method GC-MS to quantitatively analyze the benzene series, the drift of the response value of the GC-MS causes the problem of inaccurate analysis results.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for detecting benzene series pollutants in gas by using internal standard method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] For the detection of benzene series pollutants in the air or other gases in passenger cars, monofluorobenzene is used as the internal standard. Refer to the method specified in the HJ / T400-2007 standard.

[0059] Working curve:

[0060] One fluorobenzene is prepared as a 100ug / mL methanol solution: measure V with a micro-syringe is =9.76uL a fluorobenzene, inject V S =100mL volumetric flask, add chromatographically pure methanol to the mark, and shake well. The density of monofluorobenzene is ρ is =1.024g / cm 3 ; Then the mass W of monofluorobenzene in 1uL of this solution is for:

[0061] W is =V S V is ρ is / V

[0062] =(1×10 -3 mL)×(1.024g / cm 3 )×(9.76x10 -3 mL) / (100mL)

[0063] =1×10 -7 g

[0064] =100ng

[0065] W is - the mass of the internal standard in the adsorption tube;

[0066] V is - the volume of pure internal standard in the internal standard gas / liquid injected into the adsorption tube;

[0067] V S ——The volume of internal standar...

Embodiment 2

[0084] The bag method uses deuterated benzene, deuterated toluene, deuterated o-xylene, deuterated ethylbenzene and deuterated styrene as internal standards to detect the content of benzene, toluene, xylene, ethylbenzene and styrene in auto parts.

[0085] Internal standard gas: seal a 10L Teflon bag, evacuate it, and inject 5 microliters of liquid deuterated benzene, liquid deuterated toluene, liquid deuterated o-xylene, liquid deuterated ethylbenzene and liquid deuterated styrene. The bag is accurately filled with 5L of 99.999% nitrogen, and left for 30 minutes to volatilize the internal standard into the nitrogen.

[0086] Working curve:

[0087] The national standard solution GSB07-1986-2005 was used to make the working curve. National standard solution GSB07-1986-2005 solvent is methanol, benzene, toluene, o-xylene, m-xylene, p-xylene, ethylbenzene and styrene content are 10, 100, 1000ug / mL.

[0088] Put the blank TENAX adsorption tube on the standard tube production de...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
densityaaaaaaaaaa
Login to View More

Abstract

The present invention discloses a method for detecting benzene series pollutants in air by using an internal standard method. The method comprises: adopting an absorption tube filled with a benzene series absorption material to absorb and concentrate benzene series pollutants in air or other gases, heating the absorption tube, releasing the absorbed benzene series, carrying out GC-MS system analysis, and using an internal standard method during a benzene series quantitative analysis process, wherein the internal standard substance is added during a work curve drawing process and a sampling analysis process to carry out quantitative analysis on the benzene series. The method has the following advantages that: influence of external factors such as absorption efficiency, desorption efficiency, GC-MS response value drift and the like on the quantitative analysis of the benzene series is reduced, and accuracy of the detection result of the benzene series pollutants in air or other gases is improved.

Description

technical field [0001] The invention relates to a method for detecting benzene series pollutants in gas by adopting an internal standard method. Background technique [0002] Benzene, toluene, xylene, ethylbenzene, styrene and other benzene series are indoor air pollutants and also pollutants in passenger cars. To judge whether the indoor air and the air in passenger cars are qualified, it is necessary to accurately detect benzene series pollutants. [0003] General detection process: Use an adsorption tube filled with adsorption materials for benzene series to absorb and concentrate benzene series pollutants in the air or other gases, then heat the adsorption tube to release the adsorbed benzene series, enter the GC-MS system for analysis, qualitative and quantitative . During the detection process, adding an internal standard can improve the accuracy of detection. Now national standards, international standards and domestic standards are used to detect benzene series po...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G01N30/02
Inventor 陈广强周凯赵龙朱希希
Owner SHANGHAI KINGFA SCI & TECH