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Passive sampler for high-resolution determination of freely dissolved pollutant concentration of pore water

A pollutant concentration, passive sampler technology, applied in the sampling device and other directions, can solve the problems of large experimental workload, poor pollutant selectivity, long time consumption, etc., to achieve simple installation, easy field application, high vertical resolution. Effect

Inactive Publication Date: 2016-07-20
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Application Information

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Problems solved by technology

Currently, active sampling methods (such as liquid-liquid extraction, solid-phase extraction, etc.) are used to obtain the concentration of free dissolved pollutants in sediment pore water. This type of method has poor selectivity for pollutants, and the experimental workload is large and time-consuming. At the same time, The obtained concentration can only reflect the instantaneous concentration of the pollutant in the sample

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  • Passive sampler for high-resolution determination of freely dissolved pollutant concentration of pore water
  • Passive sampler for high-resolution determination of freely dissolved pollutant concentration of pore water
  • Passive sampler for high-resolution determination of freely dissolved pollutant concentration of pore water

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Embodiment Construction

[0019] 1. Before sampling, pre-treat the inorganic and organic passive sampling units respectively. Such as image 3 As shown, fill the brown glass vial 5(3) with ultrapure water (TOC<1ppb) to measure the nutrient salt in the pore water, then cover the 0.45μm microporous filter membrane 5(2) sequentially, and tightly cover the vial containing the Holes for bottle caps 5(1). When used for the determination of heavy metals, 3% (volume fraction) of concentrated nitric acid needs to be added to the bottle to prevent precipitation of heavy metals in the bottle. Cut the low-density polyethylene (LDPE) membrane used to enrich typical hydrophobic organic pollutants such as PAHs and OCPs in pore water into long strips according to the size requirements, and soak them in dichloromethane, methanol and pure water respectively. 48h, 24h, and 24h to remove impurities, and soak in pure water before use to prevent air pollution.

[0020] 2. If Figure 4 and figure 2 As shown, the strip-...

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Abstract

The invention discloses a passive sampler for high-resolution determination of the freely dissolved pollutant concentration of pore water and belongs to the field of environmental research.The device includes a supporting frame, an inorganic pollutant passive unit and an organic pollutant sampling unit.The supporting frame of the passive sampler is I-shaped, and grooves are formed in stainless steel plates of two fixing faces on both sides.A whole system is kept in a vertical state and is inserted into a water body sediment by utilizing the self gravity of the system and combining with a bottom wedge-shaped tip.After balance is performed for a period of time, the determination of the typical inorganic pollutant and organic pollutant concentrations of the sediment pore water is achieved through dialysis balancing and low-density polyethylene film enrichment respectively.A small inorganic passive sampling bottle and an organic passive sampling film are taken in a layered mode, the typical inorganic pollutant and organic pollutant concentrations are respectively determined according to corresponding treatment methods, and accordingly a high-resolution freely dissolved pollutant concentration profile in the vertical direction of a sediment-water interface is obtained.

Description

Technical field: [0001] The invention relates to a passive sampling device for measuring the concentration of pollutants in sediment pore water, in particular, it can obtain the profile curve of vertical high-resolution free dissolved pollutant concentration in sediment pore water. Background technique: [0002] Water body sediment is the main reservoir of various pollutants in the water environment, and plays the functions of "source" and "sink" of pollutants to the overlying water. Pollutants entering the water environment can be complexed, adsorbed, flocculated and finally settled in the sediment by the particles in the water body. These pollutants will be re-released from the sediment and cause "secondary pollution" of the overlying water body. Pollutants in sediments use pore water as the transport medium, migrate and diffuse to the overlying water through the surface diffusion layer, and then affect the quality of overlying water. The release of excessive nutrients i...

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Application Information

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IPC IPC(8): G01N1/10
CPCG01N1/10
Inventor 雷沛张洪单保庆
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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