Method for determining organic volatile substances in soil by using gas chromatography-mass spectrometry-headspace

Abstract

The invention discloses a method for determining organic volatile substances in soil by using the gas chromatography-mass spectrometry-headspace. The method for determining the organic volatile substances in the soil by using the gas chromatography-mass spectrometry-headspace comprises the following steps of: step 1, soil collection; step 2, sample preservation and preparation; step 3, headspace analysis; step 4, gas chromatography-mass spectrometry analysis; step 5, standard curve establishment; and step 6, calculation. The method for determining the organic volatile substances in the soil byusing the gas chromatography-mass spectrometry-headspace is characterized in that: the soil is collected into a sample bottle, and the sample bottle is sealed; meanwhile, a soil parallel sample is collected and placed in a sample bottle for sealed storage; then the sample bottles are brought back to a laboratory for analysis; the sample bottles are taken out in the laboratory and returned to theroom temperature; 2g of the sample is weighed and placed into a 22mL headspace bottle; 10mL of matrix correction solution is quickly added to the headspace bottle, and then sealed immediately; chromatographically pure methanol is taken into a sample introduction bottle; and then a volatile standard stock solution is taken into methanol. According to the invention, the organic volatile substances in the sample are not easy to volatilize and lose; the operation is convenient; the resolution is high; the linear range is good; the sensitivity is high; and the interference by the impurity peak is small.

Description

technical field [0001] The invention relates to the technical field of soil detection, in particular to a method for measuring organic volatile substances in soil by using gas chromatography-headspace. Background technique [0002] In recent years, due to the generally extensive economic development mode in my country, the industrial structure and layout are still not reasonable, the total amount of pollutant discharge is relatively high, and the soil, as the final receptor of most pollutants, has significantly affected its environmental quality. The volatile organic compounds in the soil are accumulated in the soil. In the prior art, in the determination of the organic volatile substances in the soil, the organic volatile substances are easy to volatilize and lose, the operation is inconvenient, the separation degree is not high, the linear range is not good, and the sensitivity is not high. It is greatly interfered by impurity peaks, so it is necessary to design a method for...

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Problems solved by technology

[0002] In recent years, due to the generally extensive economic development mode in my country, the industrial structure and layout are still not reasonable, the total amount of pollutant discharge is relatively high, and the soil, as the final receptor of most pollutants, has significantly affected its environmental quality. The volatile organic compounds in the soil are accumulated in the soil. In the prior art, in the determination of the organic volatile substances in the soil, the organic volatile substances are easy to volatilize and lose, the operation is inconvenient, the separation degree is not high, the linear range is not good, and the sensitivity is not high. It is greatly interfered by impurity peaks, so it is necessary to design a method for the determination of volatile organic substances in soil using GC-headspace

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