A. The characteristics of the Supelco Visiprep 12 tube SPE-12 (DL) solid-phase extraction device from the American chromatography department are as follows:

1 SupelcoThe Visiprep anti cross contamination solid-phase extraction device eliminates the potential cross contamination that may occur when processing new samples at the same location.
2. The spiral valve on the SPE device can accurately control the flow rate and process 12 samples simultaneously
3. Glass jars will not dissolve, atomize, or fade due to the presence of solvents
4. The cover is equipped with legs, which can be easily placed on the workbench when the user moves the cover away from the solid-phase extraction device
5. The spiral anti solvent vacuum pressure reducing gauge and valve provide good sealing and vacuum control, and the valve is connected to a 1/4 inch vacuum pipeline
6. The polypropylene collection tube rack can be used for automatic injection of small bottles, small scintillation tubes, 10 and 16mm test tubes, and collection plates for 1, 2, 5, and 10ml volumetric flasks - supplied by Beijing Kanglin Technology Co., Ltd.

B. Standard configuration of Supelco SPE-12 tube solid-phase extraction device: (product code: 57044)
1、Cover, with a cover pad on the back of the cover;
2、4 legs(Can be inserted into the four corners on the back of the lid)；
3、DL white flow rate control valve(12Only/pack, 1package）(Description: Already installed on the lid)；
4Solvent guided needle, stainless steel (12 pieces/pack, 1 pack);
5Disposable small column connecting tube, made of polytetrafluoroethylene (100 pieces/pack, 1 pack);
6Glass cylinder with vacuum gauge and pressure reducing valve;
7Collection rack with different sizes of collection plates (4 collection plates, 1 collection bottom plate. Suitable for automatic injection small bottles, or small scintillation tubes, or 10, 16mm diameter test tubes, or 1, 2, 5, 10mL volumetric flasks);
8、Collection tube（12Only/package,1 package);

The following accessories are optional, and different accessories can be selected according to different experimental requirements to meet the experimental requirements:
The main accessories of Supelco 12 tube solid-phase extraction device are:
Order number Product name
57044 12 tube anti cross contamination SPE extraction device (standard for the host)
57100-U 12 tube SPE drying device (required for sample drying and concentration, similar to a nitrogen blower)
57275 large capacity sampling tubes, 4 tubes/set, used for 1ml, 3ml, 6ml solid-phase extraction columns (when the sample volume is large (exceeding 100ml, the large capacity sampler is connected to the solid-phase extraction column, and the sample can be automatically added to the column)
57272 large capacity sampling tube 3 tubes/set, used for 12 ml, 20ml, 60ml solid-phase extraction columns (with the same function as 57275)
57059 Solid phase extraction connecting tube (polytetrafluoroethylene) 100 tubes/pack (anti cross contamination transmission line,Every time the small column connecting tube is replaced, it can avoid cross contamination between samples. There is 1 package included as standard
57120-U 1000ml solid phase extraction buffer bottle, made of plastic polypropylene (connected between the solid phase extraction device and the oil-free vacuum pump to prevent waste liquid from being sucked into the vacuum pump and damaging it, must be purchased when purchasing the solid phase extraction device for the first time)
57020-USPE adapter (small column adapter) 12 pieces/pack (2 types of small columns need to be connected in series, or need to be included when making SPE manually)
001012 SPE adapter (domestic)）12 pieces/pack (2 types of small columns need to be connected in series, or need to be included when making SPE manually)
DOA-P504-BN imported oil-free diaphragm vacuum pump from Gast in the United States, pumping speed: 25L/min (for vacuuming the solid-phase extraction device to improve solid-phase extraction efficiency, it is a necessary accessory. If there is a vacuum pump in the laboratory, it is not required)
Oil free diaphragm vacuum pump, pumping speed 20L/min (with the same function as above, choose either imported or domestic vacuum pump)