Solid phase extraction small column loaded with silver ions and preparation and application thereof

The invention relates to a solid phase extraction small column loaded with silver ions and preparation and application thereof; 5-20 grams of silica spheres with the diameter of 40-60 micron are loaded into a cylindrical tube with the inner diameter of 3-6 cm and the height of 20-30 cm, wherein the surface of the silica spheres is bonded with phenylsulfonic acid functional groups, the lower end of the cylindrical tube is plugged with degreasing cotton, 1mol / L silver nitrate solution with 3 times of silica gel mass, deionized water with 5 times of silica gel mass, anhydrous alcohol with 3 times of silica gel mass, and dichloromethane with the same mass as silica gel are in turn used for elution, an obtained silica gel packing is dried for 3H at 120 DEG C, then cooled, and put into a dryer for sealed preservation away from light; 0.8-1.5 grams of the packing is loaded into a polypropylene column tube with the inner diameter of 0.5-1.5 cm and the height of 5-6 cm for preparation of the solid phase extraction s