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Automatic Sample Extraction/Collection System for Pesticide Residue in Food |
The extraction of trace amounts of pesticides in food and soil is generally performed using solvent-based extraction and GPC cleanup techniques. Extraction of the samples consume large quantities of hazardous organic solvents and considerable time, causing environmental problems. The supercritical fluid extraction system offers a solution to these problems. This technique is a safe, automated, rapid, selective, easy, and waste-minimizing approach to extraction which uses supercritical carbon dioxide to dissolve analytes of interest rather than liquid organic solvents.
Schematic Flow Diagram of the System
1. Liquid CO2 Cylinder
2. Modifier
3. Liquid CO2 pump
4. Modifier pump
5. Pre-heating coil
6. Make-up solvent
7. Oven
8. 6-seletor valve
9. Extraction vessel (6 vessels)
10. Stop valve
11. Make-up pump
12. Back pressure regulator
13. 6-vessel changer
14~19. Fraction tubes (6 bottles)
20. System controller
21. 3-way valve
22. Trap-column
23. Collection valve
SFE/SFC Components:
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