Method for quantitatively detecting 2, 4-dichlorophenol in water

Abstract

The invention relates to a method for quantitatively detecting 2, 4-dichlorophenol in water, belonging to the field of analysis and detection of a compound. The invention provides a method for detecting 2, 4-dichlorophen in water through a head space solid phase microextraction-gas chromatography. The extracting head of the solid phase microextraction has the effect of gathering volatilizing components and can detect trace 2, 4-dichlorophen in water. The method can be used as a standard method for detecting the concentration of 2, 4-dichlorophen in water, the pretreatment is simple and rapid, and only needs heating and extracting for 30 minutes, no solvent is needed, the method is safe and environment-friendly, the dosage of the sample is less, the method has good linear adding standard recovery, and the detection sensitivity can reach 6.54mu g / L.

Description

technical field

[0001] The invention relates to the quantitative detection of 2,4-dichlorophenol in water. The method combines headspace solid-phase microextraction and gas chromatography detection technology to quickly and accurately quantitatively detect 2,4-dichlorophenol, which belongs to compound analysis detection field. Background technique

[0002] 2,4-Dichlorophenol (2,4-DCP) is a toxic and refractory organic pollutant, which is replaced by chlorine atoms at the 2 and 4 positions on the benzene ring of phenol produced. Over the years, it has entered the environment through human activities such as waste incineration, uncontrolled use of wood preservatives, pesticides, fungicides, herbicides, and pulp bleaching; at the same time, as a solvent, lubricant Agents and synthetic waste are released into the environment.

[0003] 2,4-Dichlorophenol has the three effects of "teratogenic, carcinogenic and mutagenic". It can accumulate in the body and has strong biological ...

Examples

Embodiment 1

[0027] Embodiment 1: the selection of working curve

[0028] Prepare a series of standard solutions with concentrations of 0mg / L, 0.1mg / L, 0.2mg / L, 0.3mg / L, 0.4mg / L, and 0.5mg / L, and measure them according to the steps in the summary of the invention. Taking the concentration of 2,4-dichlorophenol as the x-axis, and the ratio of the peak area of ​​2,4-dichlorophenol and 1,4-dichlorobenzene as the y-axis, a curve representing the relationship between the two is established, and its equation is: y =2.9737x, R of the curve 2 =0.9944, good linearity.

Embodiment 2

[0029] Embodiment 2: the mensuration of actual water sample

[0030] Before detection, the fiber head is aged first. The aging chromatographic conditions are: HP-5 capillary column; gasification chamber temperature: 260°C; detector temperature: 280°C; / min to 260°C and keep for 30min; the carrier gas is nitrogen, the flow rate: 2ml / min; make-up gas: 60ml / min. After aging, set the chromatographic conditions as follows: HP-5 capillary column; gasification chamber temperature: 260°C; detector temperature: 280°C; column temperature: 60°C, keep for 5 minutes, and rise to 130°C at 15°C / min , rise to 280°C at 30°C / min, and keep for 2min; the carrier gas is nitrogen, the flow rate: 2ml / min; make-up gas: 60ml / min.

[0031] The water sample is the effluent of the laboratory reactor, and the concentration of 2,4-dichlorophenol contained in the effluent is higher than the maximum concentration value of 0.5 mg / L that can be detected by this method. Therefore, when preparing the sample, it...

technical field

[0001] The invention relates to the quantitative detection of 2,4-dichlorophenol in water. The method combines headspace solid-phase microextraction and gas chromatography detection technology to quickly and accurately quantitatively detect 2,4-dichlorophenol, which belongs to compound analysis detection field. Background technique

[0002] 2,4-Dichlorophenol (2,4-DCP) is a toxic and refractory organic pollutant, which is replaced by chlorine atoms at the 2 and 4 positions on the benzene ring of phenol produced. Over the years, it has entered the environment through human activities such as waste incineration, uncontrolled use of wood preservatives, pesticides, fungicides, herbicides, and pulp bleaching; at the same time, as a solvent, lubricant Agents and synthetic waste are released into the environment.

[0003] 2,4-Dichlorophenol has the three effects of "teratogenic, carcinogenic and mutagenic". It can accumulate in the body and has strong biological ...

Examples

Embodiment 1

[0027] Embodiment 1: the selection of working curve

[0028] Prepare a series of standard solutions with concentrations of 0mg / L, 0.1mg / L, 0.2mg / L, 0.3mg / L, 0.4mg / L, and 0.5mg / L, and measure them according to the steps in the summary of the invention. Taking the concentration of 2,4-dichlorophenol as the x-axis, and the ratio of the peak area of ​​2,4-dichlorophenol and 1,4-dichlorobenzene as the y-axis, a curve representing the relationship between the two is established, and its equation is: y =2.9737x, R of the curve 2 =0.9944, good linearity.

Embodiment 2

[0029] Embodiment 2: the mensuration of actual water sample

[0030] Before detection, the fiber head is aged first. The aging chromatographic conditions are: HP-5 capillary column; gasification chamber temperature: 260°C; detector temperature: 280°C; / min to 260°C and keep for 30min; the carrier gas is nitrogen, the flow rate: 2ml / min; make-up gas: 60ml / min. After aging, set the chromatographic conditions as follows: HP-5 capillary column; gasification chamber temperature: 260°C; detector temperature: 280°C; column temperature: 60°C, keep for 5 minutes, and rise to 130°C at 15°C / min , rise to 280°C at 30°C / min, and keep for 2min; the carrier gas is nitrogen, the flow rate: 2ml / min; make-up gas: 60ml / min.

[0031] The water sample is the effluent of the laboratory reactor, and the concentration of 2,4-dichlorophenol contained in the effluent is higher than the maximum concentration value of 0.5 mg / L that can be detected by this method. Therefore, when preparing the sample, it...

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