Gas Chromatography - Quantitative Analysis > Page 54
This type of extraction system is useful for biotechnology samples. An example of the use of solid phase extraction to determine trace amounts (5 ppb) of some chlorinated pesticides in drinking water is shown in figure 36. The extraction tube was designated as the Novo-Clean C18. It was 47 mm tube long which included the membrane manifold. The materials were removed from the water sample by dispersive interactions between the solutes and the C18 reversed phase. The tube was conditioned before use with 10 ml of methanol, 10 ml of methyl-tributylether (MTBE), 15 ml of methanol and finally 125 ml of deionized water.
Courtesy of Alltech Inc
|1. Lindane–a||9. p,p'-2-chlorophenyl,2-p-chlorpenyl 1,1,dichloroethylene|
|2. Lindane–b||10. Endrin|
|3. Lindane–g||11. p,p'-2,2-bis p chlorpheny1 chlor- ethylene|
|4. Lindane-D||12. Endrin aldehyde|
|5. Heptachlor||13. Ensodulfan Sulfate|
|6. Aldrin||14 p,p'-1'1'1-trichlor, 2,2-bis p chloro phenyl ethane|
|7. Heptachlo Epoxide||15. Endosulfan II|
Figure 36. Separation of Some Chlorinated Pesticides Removed from Drinking Water by Solid State Extraction.