In-site continuous sampling device for water soluble organic pollutant
A technology of organic pollutants and sampling devices, which is applied in the direction of sampling devices and the preparation of test samples, etc., can solve the problem of damage, cannot fully reflect the occurrence form and biological effectiveness of pollutants, and is not suitable for collecting organic pollutants in soil solution, etc. question
Inactive Publication Date: 2006-08-23
INST OF SOIL SCI CHINESE ACAD OF SCI
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Its disadvantages are: (1) If the environmental conditions (such as redox potential, CO 2 Partial pressure, etc.) changes drastically, the form or valence state of pollutants will change, resulting in the analysis results not fully reflecting the occurrence form and biological availability of pollutants under natural conditions; (2) off-site sampling is destructive Sampling, continuous sampling cannot be performed at the same point
However, these soil solution sampling devices are all designed to collect inorganic components in soil solution, and their filter elements (such as porous polyethersulfone (PES) hollow fiber tubes of miniature soil solution samplers) or components (common plastic or PVC Pipelines, etc.) have adsorption to organic matter, so it is not suitable for collecting organic pollutants in soil solution, especially trace water-soluble organic pollutants
In addition, the filter accuracy of the clay tube is low, and the mechanical strength of the micro-soil solution sampler is poor. Both of them are easily damaged after long-term use, and usually cannot be reused.
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[0015] Typical example:
[0016] The liquid collecting pipe (1) uses a duplex stainless steel pipe (grade: 00Cr18Ni5Mo3Si2) with an inner hole diameter of 16 mm and a wall thickness of 2 mm;
[0017] The filter head (2) or microporous filter (7) uses a titanium metal filter tube (manufactured by Shijiazhuang Porter Inorganic Membrane Separation Equipment Co., Ltd.) with an inner hole diameter of 25 mm, a wall thickness of 1 mm, and a filter pore ≤ 0.2 μm;
[0018] The pumping tube (3) uses a polyperfluoroethylene propylene tube (produced by Jiangsu Binhai Zhenghong Plastic Factory) with an aperture of 1 mm.
[0019] For soil (dry land or paddy field) or solid waste, according to the requirements of sampling depth, part of the filter head (2) and liquid collection pipe (1) can be buried in the soil or solid waste during sampling, and the suction pipe and the micro Connected with a vacuum pump, the filtrate water sample of interstitial water in the soil solution or solid waste ...
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This invention relates to an in-situ and continuous sampling device for soluble organic pollutants composed of a solution accumulating tube, a filter head, a sucker tube, a silica-gel piston, a gas sucker and a sample collecting bottle, in which, the solution collecting tube is made of stainless steel, the filter head is processed by micro-hole Ti tubes, the solution sucking tube is a poly ethane-propene tube. Since the mechanical strength of the Ti tube filter head is big, chemical stability is good and is anti-high, low temperature, acid-proof and alkali-proof, it can analyze soluble organic pollutants in various kinds of media quantitatively and directly.
Description
1. Technical field [0001] The invention belongs to a sample pretreatment device for solid-liquid separation using the principle of microporous filtration, especially suitable for in-situ water-soluble extraction from dry land, paddy fields, solid waste (such as landfill garbage, sludge, etc.) and water bodies. Continuous sampling of organic pollutants. 2. Background technology [0002] Due to the impact of human life and production activities, more and more organic pollutants enter and accumulate in environmental media such as soil and water through various channels. These organic pollutants can endanger human health and ecosystem security through migration, bioaccumulation, and food chain transfer. [0003] Soil, solid waste, etc. are complex environmental matrices containing different phases (solid, liquid, and gas), and the organic pollutants entering them will inevitably be dynamically distributed between different phases. Non-polar organic compounds are almost insolub...
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IPC IPC(8): G01N1/14G01N1/28
Inventor 宋静栾天罡王晓玮骆永明李晨曦
Owner INST OF SOIL SCI CHINESE ACAD OF SCI