A kind of solid phase extraction filter and preparation method thereof
An extraction filter and filter technology, applied in chemical instruments and methods, separation methods, preparation of test samples, etc., can solve the problems of poor separation effect, poor repeatability, and low recovery rate, and achieve low cost and accurate results. , good repeatability
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Embodiment 1
[0018] A solid phase extraction filter, the filter is formed by filling filter membrane, silica gel plate 1, dispersant, silica gel plate 2, modified fly ash and fine sand in the filter cartridge sequentially from bottom to top; The modified fly ash is first activated by 3 times the amount of 1mol / L sulfuric acid from the fly ash, cleaned with water, treated with 5 times the amount of 20mg / L sodium hydroxide solution, and finally cleaned with water to obtain; The inner diameter of the filter cartridge is 8mm, and the inner height of the cartridge is 78mm; the lower end of the filter cartridge is provided with a length of 15mm, and an outlet pipe with an inner diameter of 4mm; the filter membrane is a polytetrafluoroethylene membrane, and its pores are 0.45 μm; both the silica gel plate 1 and the silica gel plate 2 need to be dried and dehydrated at 200°C; the dispersant is activated carbon; the dispersant needs to be baked at 200°C for 4 hours, and the particle size of the fine...
Embodiment 2
[0020] A solid phase extraction filter, the filter is formed by filling filter membrane, silica gel plate 1, dispersant, silica gel plate 2, modified fly ash and fine sand in the filter cartridge sequentially from bottom to top; The modified fly ash is obtained by first activating the fly ash with 3 times the amount of 1mol / L sulfuric acid, washing it with water, treating it with 5 times the amount of 20mg / L sodium hydroxide, and finally washing it with water; The inner diameter of the cartridge is 8mm, and the inner height of the cartridge is 78mm; the front end of the filter cartridge is provided with a conduit with a length of 15mm and an inner diameter of 4mm; the filter membrane is a polyethylene film with a pore size of 0.8 μm; the silica gel Both plate 1 and silica gel plate 2 need to be dried and dehydrated at 200°C; the dispersant is propylamino-bonded silica gel; the dispersant needs to be baked at 200°C for 4 hours, and the particle size of the fine sand is 100 μm. ...
Embodiment 3
[0022] A solid phase extraction filter, the filter is formed by filling filter membrane, silica gel plate 1, dispersant, silica gel plate 2, modified fly ash and fine sand in the filter cartridge sequentially from bottom to top; The modified fly ash is obtained by first activating the fly ash with 3 times the amount of 1mol / L sulfuric acid, washing it with water, treating it with 5 times the amount of 20mg / L sodium hydroxide, and finally washing it with water; The inner diameter of the cartridge is 8mm, and the inner height of the cartridge is 78mm; the front end of the filter cartridge is provided with a conduit with a length of 15mm and an inner diameter of 4mm; the filter membrane is a polyethylene film with a pore size of 0.8 μm; the silica gel Plate 1 and silica gel plate 2 need to be dried and dehydrated at 200°C; the dispersant is benzenesulfonic acid-based cation exchange bonded silica gel; the dispersant needs to be baked at 200°C for 4 hours, and the particle size of ...
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