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A method for the determination of seven polychlorinated biphenyls in soil by ultrasonic-assisted headspace-solid phase microextraction

A polychlorinated biphenyl and ultrasonic-assisted technology, applied in the field of soil pollutant detection, can solve the problems of time-consuming and cumbersome steps, and achieve the effects of improving sensitivity, simplifying experimental steps, and wide application prospects

Active Publication Date: 2019-07-12
NINGBO UNIV
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  • Abstract
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  • Claims
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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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  • A method for the determination of seven polychlorinated biphenyls in soil by ultrasonic-assisted headspace-solid phase microextraction
  • A method for the determination of seven polychlorinated biphenyls in soil by ultrasonic-assisted headspace-solid phase microextraction

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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 kinds of polychlorinated biphenyl in soil by applying an ultrasonic assistance-headspace-solid phase microextraction technology. The method comprises the following steps: (1) treating samples; (2) performing ultrasonic assistance headspace solid phase microextraction; (3) performing gas chromatography-mass spectrum combination and starting a dataacquisition instrument to acquire data of the polychlorinated biphenyl; and (4) performing data processing: repeating the steps (1), (2) and (3) for three times to obtain four groups of data of the polychlorinated biphenyl in the step (3), drawing a standard curve and calculating the concentration of the polychlorinated biphenyl in the soil. The method for quantitatively analyzing seven kinds ofpolychlorinated biphenyl in the soil is simple, convenient, environment-friendly and safe, the sensitivity is improved, and a certain practical significance and wide application prospect are achieved.

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 Patents(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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