New Developments in QuEChERS methodology
New Developments in QuEChERS methodology
New Developments in QuEChERS methodology
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pH-Labile Compounds<br />
EPRW 2006, Corfu<br />
Slide 9<br />
Some Pesticides are sensitive to pH<br />
and degrade at high or low pH-values<br />
• In the sample (dur<strong>in</strong>g process<strong>in</strong>g and storage)<br />
� Keep low temperatures<br />
• Dur<strong>in</strong>g sample preparation<br />
� Work fast, adjust pH<br />
• In the extract dur<strong>in</strong>g storage (1 week is common)<br />
� Keep low temperatures, adjust pH,<br />
after dispersive SPE with PSA, pH may reach values exceed<strong>in</strong>g 8
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