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For several commodities specific modifications of QuEChERS method are necessary.

Avocado is a matrix containing both high amount of fat and water, therefore water is added prior to extraction and fat is removed by freezing out.
»Avocado (pdf)

Plant oil can be analyzed using QuEChERS method by directly adding acetonitrile to 2 g oil. Only very unpolar pesticides like HCB or DDT have recoveries below 70 %. Residual fat is removed by freezing out before PSA cleanup.
»Oil (pdf)

Black tea is a very difficult matrix having a lot of co-extractives. Therefore additional cleanup is necessary. For black tea a combination of PSA and CaCl2 improves cleanup procedure.
»Tea (pdf)

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last update: 2011-05-15