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Novel pretreatment technology for testing polycyclic aromatic hydrocarbon in soil

A technology for polycyclic aromatic hydrocarbons and soil, applied in the preparation of test samples, measuring devices, sampling, etc., can solve the problems of low processing efficiency, achieve the effects of improving utilization efficiency, simple and effective operation process, and reducing consumption

Inactive Publication Date: 2020-07-10
GUANGDONG BYTEST TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the deficiencies of the existing technology, the present invention provides a new pretreatment technology for testing polycyclic aromatic hydrocarbons in soil, which has the advantages of simple operation and high treatment efficiency, and solves the problem of low traditional treatment efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The novel pretreatment technology of polycyclic aromatic hydrocarbons in the test soil of the present invention comprises the following steps:

[0027] S1. Preparation of soil samples: First, put the collected fresh soil into a glass container, then use sterile tweezers to remove foreign matter such as roots, leaves, stones, etc. from the soil, and fully mix the remaining soil, and then weigh a certain amount. Measure the clean soil sample and put it in a glass container, add an appropriate amount of desiccant to the glass container, stir the soil evenly, dehydrate and dry the soil, and then grind the dehydrated soil into fine particles for use;

[0028] S2. Put an appropriate amount of soil particles into the extraction pool, add an organic solvent to the extraction pool, seal the extraction pool, and shake the extraction pool to fully mix the soil particles in the extraction pool with the organic solvent;

[0029] S3, insert the extraction cell into the tripod, and le...

Embodiment 2

[0042] Embodiment 2: Different from Embodiment 1, the desiccant used in step S1 is anhydrous sodium sulfate.

[0043] The organic solvent used in the S2 step is dichloromethane.

[0044] In step S6, the heating temperature range of the extraction pool is 120° C., and the pressure in the extraction pool is 1 MPa.

[0045] The reaction time in the S7 step is 7 min.

[0046] The desiccant used in this embodiment is anhydrous sodium sulfate, and the organic solvent is dichloromethane. The reaction is carried out at a temperature of 120 degrees Celsius and an environment of 1.3 MPa. The reaction time needs 7 minutes, and the reaction takes a long time. The soil sample and The reaction of the organic solvent is relatively sufficient, and the recovery rate of polycyclic aromatic hydrocarbons is 80%.

Embodiment 3

[0047] Embodiment 3: Different from Embodiment 1, the desiccant used in step S1 is montmorillonite.

[0048] The organic solvent used in the S2 step is acetone.

[0049] In step S6, the heating temperature range of the glass container is 145° C., and the pressure in the glass container is 1.6 MPa.

[0050] The reaction time in the S7 step is 6 min.

[0051] The desiccant used in this embodiment is montmorillonite, the organic solvent is acetone, and the reaction is carried out at a temperature of 145 degrees Celsius and an environment of 1.6 MPa. The reaction time needs 6 minutes, and the time required for the reaction is moderate. In this environment, the soil sample and The reaction of the organic solvent is more sufficient, and the recovery rate of polycyclic aromatic hydrocarbons is 90%.

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Abstract

The invention relates to the technical field of polycyclic aromatic hydrocarbon pretreatment. The invention particularly discloses a novel pretreatment technology for testing polycyclic aromatic hydrocarbon in soil. First, a soil sample is prepared, and the prepared soil sample is put into an extraction tank; an organic solvent is added into the extraction tank, and the soil sample in the extraction tank is fully mixed with the organic solvent under the conditions of high temperature and high pressure; after reaction for a period of time, the solution in the extraction tank is layered; and finally, the solution at the lower layer of the extraction tank is discharged, and the supernatant of the extraction tank is extracted into a clean test tube for subsequent test. According to the method,precious and precise instruments are not needed, operation can be conducted only through an air booster pump, the extraction tank, an alcohol lamp and a triangular support, the polycyclic aromatic hydrocarbon and the organic solvent in the soil can be mixed more rapidly and fully, the utilization efficiency of the organic solvent is improved, and the usage amount of the organic solvent is reduced.

Description

technical field [0001] The invention relates to the technical field of pretreatment of polycyclic aromatic hydrocarbons, in particular to a novel pretreatment technology for testing polycyclic aromatic hydrocarbons in soil. Background technique [0002] Polycyclic aromatic hydrocarbons are coal, petroleum, wood, tobacco, widely present in the natural environment of human life, such as the atmosphere, water, soil, crops and food, and are volatile hydrocarbons produced when organic substances such as organic polymers are incompletely burned. Any place where organic matter is processed, discarded, burned or used may produce polycyclic aromatic hydrocarbons. Polycyclic aromatic hydrocarbons are important environmental and food pollutants. In recent years, with the intensification of human production activities, their presence in the environment has been destroyed. The dynamic balance of the environment increases the amount of polycyclic aromatic hydrocarbons in the environment. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28G01N1/34G01N1/40G01N1/44
CPCG01N1/28G01N1/34G01N1/4044G01N1/44
Inventor 郑小萍刘奔黎嘉雯陈泽钿黄振中郑丹霞李丽华蓝文林魏素枝
Owner GUANGDONG BYTEST TECH CO LTD
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