New Developments in QuEChERS methodology
New Developments in QuEChERS methodology
New Developments in QuEChERS methodology
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Optimal pH for <strong>QuEChERS</strong> ?<br />
pH adjustment after cleanup<br />
Use of formic acid <strong>in</strong> acetonitrile to achieve a “pH” of 5<br />
Base-labile compounds are stabilized:<br />
tolylfluanid,<br />
dichlofluanid,<br />
captan,<br />
Rec. %<br />
100<br />
90<br />
80<br />
70<br />
Tolylfluanid extract stability<br />
7 days<br />
13 days<br />
folpet,<br />
60<br />
50<br />
dicofol,<br />
40<br />
30<br />
pyridate<br />
20<br />
5% formic acid: 10 µL/mL<br />
EPRW 2006, Corfu<br />
Slide 13<br />
10<br />
0<br />
pH 4 pH 5 pH 6 pH 7 pH 8 pH 9 MeCN<br />
Measured pH <strong>in</strong> extract
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