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Half-volatilization persistency organic contaminant near groundlevel concentration vertical profile sampling apparatus

A technology of organic pollutants and sampling devices, applied in the direction of measuring devices, sampling, instruments, etc.

Inactive Publication Date: 2011-01-12
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of this invention is to provide a kind of semi-volatile persistent organic pollutant near-ground concentration vertical section sampling device, to solve the above-mentioned defects that existing active sampling technology exists

Method used

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  • Half-volatilization persistency organic contaminant near groundlevel concentration vertical profile sampling apparatus
  • Half-volatilization persistency organic contaminant near groundlevel concentration vertical profile sampling apparatus
  • Half-volatilization persistency organic contaminant near groundlevel concentration vertical profile sampling apparatus

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Experimental program
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Effect test

Embodiment 1

[0025] After sampling, use a fat extractor to perform Soxhlet extraction on the absorption medium (100ml of dichloromethane, 50°C, 24 hours), and rotary steam the extract to about 1ml. If the concentrated extract is clear and transparent, with less impurities, After adding about 10ml of n-hexane, continue to concentrate to about 1ml, then add internal standard (internal standard method, internal standard selection 2-fluoro-1, 1′-biphenyl and p-terphenyl-d14, J&K Chemical, USA) and directly upload GC-MS instrument for analysis. If there are many impurities in the extract, it needs to be purified and analyzed on the machine. The purification adopts the chromatography column purification method, and the neutral silica gel (4g, 80-100 mesh, 3% deactivated)+neutral alumina (4.75g, 3% deactivated)+anhydrous sodium sulfate ( Height 1cm), 50ml of dichloromethane and n-hexane mixed solution (1:1) at a speed of 2.0ml / min, collect the eluate, concentrate to about 1ml, add internal stand...

Embodiment 2

[0038] table 3

[0039]

Sample location

type

sampling date

A

Mentougou, Beijing: Xiaolongmen Forest System Research Station

background

9 / 20-11 / 16

B

Beijing Miyun: Hexi Village, Gubeikou Town

the countryside

9 / 22-11 / 14

C

Downtown Tianjin: Environmental Protection Bureau

City

9 / 25-11 / 15

[0040] The daily average sampling volume of the sampling boxes in each layer of the sample point is used to indirectly represent the vertical profile of PAHs concentration in the air near the surface, so as to judge the migration direction of PAHs between the soil-air interface near the surface. Figure 5 It is the concentration profile of the monitoring results of the passive sampler for the air vertical profile near the ground at various sampling points. The results show that the PAH of sample points A and B 9 The concentration increases approximately linearly with the height from the ground, while...

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Abstract

The invention relates to a semi-volatile persistent organic pollutant ground concentration vertical section sampling device which comprises a metal support and a sampling box. The sampling device is characterized in that the metal support is vertically arranged on the ground and is provided with openings at different heights of different directions for arranging the sampling box. In the scheme, apassive sampling technology is adopted and passive sampling media are adopted at different heights from the ground, thus obtaining the ground gaseous semi-volatile persistent organic pollutant concentration vertical section information for earth-atmosphere exchange research, and avoiding the problem of disturbance to the air layer when an air pump in the active sampling technology extracts air, therefore, the sampling device is more applicable to obtaining the concentration section information of the pollutant in the vertical direction.

Description

technical field [0001] The invention relates to the technical field of atmospheric monitoring, in particular to a passive sampling device for near-ground concentration vertical profiles of gaseous semi-volatile persistent organic pollutants. Background technique [0002] Semi-volatile persistent organic pollutants mainly exist in soil and atmospheric media in the environment, and are exchanged between soil-air interfaces through sedimentation, volatilization, and diffusion. With the help of the near-surface concentration profile information, the migration direction of semi-volatile persistent organic pollutants between the soil-air interface can be inferred, and the diffusion flux between the two phases can be estimated indirectly. [0003] At present, active sampling technology is generally used to complete the collection of near-surface concentration information of semi-volatile persistent organic pollutants. For example, Kurt-Karakus et al. (Perihan Binnur Kurt-Karakus, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/26
Inventor 曹军陶澍刘娅囡邓蜀星张羽中王文涛赵靖宇王伟
Owner PEKING UNIV