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Synchronous measuring sediment pore-water inorganic and organic matter concentration passive sampler

A passive sampler, passive sampling technology, used in instruments, measuring devices, scientific instruments, etc.

Inactive Publication Date: 2017-03-29
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Now the most commonly used passive sampling techniques are semi-permeable membrane devices (SPMDs), solid-phase micro-extraction (solid-phase micro-extraction, SPME) and thin film gradient diffusion technology (diffusion-gradient in thin-films). , DGT), but they can only be determined separately for a certain type of pollutants (such as hydrophobic organic pollutants and metal ions, etc.)

Method used

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  • Synchronous measuring sediment pore-water inorganic and organic matter concentration passive sampler
  • Synchronous measuring sediment pore-water inorganic and organic matter concentration passive sampler

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Embodiment Construction

[0021] 1. Before sampling, pre-treat the passive sampling vials. Such as figure 1 As shown, add ultrapure water (TOC<1ppb) to the nutrient sampling vial 3 in the pore water to be measured; add ultrapure water and nitric acid (excellent grade) to the sampling vial of heavy metals in the pore water to be measured, and make the concentration of nitric acid The volume fraction is 3%; a sheet of low-density polyethylene (LDPE) film that has an adsorption effect on hydrophobic organic pollutants such as polycyclic aromatic hydrocarbons PAHs and organochlorine pesticides OCPs is cut into strips and placed in dichloromethane, methanol and Soak in pure water for 48h, 24h and 24h to remove impurities. Then place the strip-shaped LDPE film 4 in the passive sampling vial 3 and fill it up with ultrapure water. After each sampling vial is preloaded, the 0.45 μm microporous filter membrane 2 is sequentially covered, and the bottle cap 1 containing the mesopore is tightly closed.

[0022] ...

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Abstract

The invention discloses a synchronous measuring sediment pore-water inorganic and organic matter concentration passive sampler, and belongs to the field of environmental research. The synchronous measuring sediment pore-water inorganic and organic matter concentration passive sampler comprises a passive sampling system and a supporting framework. In applications, sampling small bottles are filled with ultrapure water, are preloaded with different chemicals or articles based on the difference of pollutants, are covered with 0.45<mu>m microfiltration membrane, and are sealed with bottle caps provided with middle holes; the sampling small bottles are placed in grooves in the supporting framework; the whole synchronous measuring sediment pore-water inorganic and organic matter concentration passive sampler is immersed into water body sediment vertically under the action of self weight, and is allowed to stand; when balance is achieved, the synchronous measuring sediment pore-water inorganic and organic matter concentration passive sampler and the passive sampling small bottles are taken out from the water body sediment; and the concentrations of nutritive salts, heavy metals, and organic pollutants in wate samples in the passive sampling small bottles are measured via corresponding methods, so that synchronous measuring of high resolution ratio sediment-water interface inorganic and organic pollutant concentration is realized.

Description

[0001] Technical field: [0002] The invention relates to a passive sampling device for measuring the concentration of pollutants in sediment pore water, in particular to synchronously measuring inorganic and organic pollutants in free dissolved state in sediment pore water. [0003] Background technique: [0004] Sediment, as the main reservoir of pollutants in the water environment, can reflect the status of the water body being polluted. Most inorganic and organic pollutants (such as nutrients, heavy metals, and toxic organic polycyclic aromatic hydrocarbons PAHs, organochlorine pesticides OCPs, etc.) enter the water body and are absorbed by the particles in the water body and eventually accumulate in the bottom sediment of the receiving water body. Once the water body environment Changes occur, and these are re-released from the sediment, leading to "secondary pollution" of the water body. In addition, sediments are also habitats for benthic animals, and the pollutants the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/10G01N27/62
Inventor 单保庆雷沛张洪孔学红
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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