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Method for measuring seven kinds of polychlorinated biphenyl in soil by applying ultrasonic assistance-headspace-solid phase microextraction technology

An ultrasonic-assisted, polychlorinated biphenyl technology is applied in the field of soil pollutant detection, which can solve the problems of cumbersome steps, long time-consuming and the like, and achieve the effects of simplifying experimental steps, improving sensitivity, and simple quantitative analysis methods.

Active Publication Date: 2018-01-12
NINGBO UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

However, most of these methods require the use of a large amount of organic solvents for extraction, and the steps are cumbersome and time-consuming.
There is no report on the simultaneous determination of polychlorinated biphenyls in soil by ultrasonic-assisted-headspace solid-phase microextraction-gas chromatography-mass spectrometry

Method used

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  • Method for measuring seven kinds of polychlorinated biphenyl in soil by applying ultrasonic assistance-headspace-solid phase microextraction technology
  • Method for measuring seven kinds of polychlorinated biphenyl in soil by applying ultrasonic assistance-headspace-solid phase microextraction technology

Examples

Experimental program
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Effect test

Embodiment

[0050] Example: Detection of real samples

[0051] (1) Sample treatment: Grind the soil to be tested evenly with a mortar, weigh 10.0 g of the soil into three 40 mL headspace bottles, add 70 μL of 250 μg / L octafluoronaphthalene, and then add 5 g of sodium chloride, Add 90 μL of mixed standard PCBs to 10 mL of deionized water (0, 180, and 270 μL were added when repeating the second, third, and fourth times), adjust the pH value to 7, and mix the sample;

[0052] Among them, mixed standard polychlorinated biphenyl solution (concentration of PCB28, PCB 52, PCB 101: 556 μg / L; concentration of PCB 118, PCB138, PCB 153, PCB 180: 1667 μg / L).

[0053] Ultrasonic-assisted headspace solid-phase microextraction: seal the mouth of the bottle, insert a commercial extraction head coated with DVB / CAR / PDMS, place the above-mentioned volumetric flask in an ultrasonic cell pulverizer for water-bath ultrasonication, and the extraction conditions are as follows: ultrasonic frequency 100W, the ex...

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Abstract

The invention provides a method for measuring seven polychlorinated biphenyls in soil by using ultrasonic-assisted-headspace-solid-phase microextraction technology, comprising the following steps: (1) sample processing; (2) ultrasonic-assisted headspace solid-phase microextraction Extraction; (3) gas chromatography-mass spectrometry, start the data acquisition instrument to collect the data of polychlorinated biphenyls; (4) data processing: repeat the above (1), (2), (3) steps 3 times to obtain 4 groups The data of polychlorinated biphenyls in above-mentioned (3), draw standard curve, calculate the concentration of polychlorinated biphenyls in soil. The invention establishes a quantitative analysis method for seven kinds of polychlorinated biphenyls in soil, which is simple, green and safe, and has improved sensitivity, and has certain practical significance and wide application prospects.

Description

technical field [0001] The invention belongs to the detection field of soil pollutants, and in particular relates to a method for measuring seven kinds of polychlorinated biphenyls in soil by using an ultrasonic-assisted-headspace-solid-phase microextraction technique. Background technique [0002] Polychlorinated biphenyls, also known as polychlorinated biphenyls, are a general term for many biphenyl chlorine-containing compounds with different chlorine numbers. Polychlorinated biphenyls are liquids heavier than water at room temperature, with good heat resistance and electrical insulation properties, and stable chemical properties; they are insoluble in water, easily soluble in organic solvents and fats, and can be used as lubricating materials, plasticizers, and sterilizers. It is widely used in various fields such as insulating oil of electrical appliances, pressure-sensitive paper, etc. In my country, PCB is traditionally divided into trichlorobiphenyl (PCB3), tetrachl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/88G01N30/06
Inventor 干宁吕芳英张利李天华曹玉廷
Owner NINGBO UNIV
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