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The organotin pesticides fentin, cyhexatin and fenbutatin oxide have very good recovery rates using QuEChERS method. For LC-MS/MS analysis however, acidic conditions are of paramount importance to achieve good peak shapes.
Organotin Pesticides (pdf)

Base-labile compounds like captan, folpet, dichlofluanid and others degrade in QuEChERS extracts after PSA cleanup. Therefore the extracts have to be acidified using formic acid to a pH of about 5 to stabilize these base-labile compounds.
Base-labile Pesticides (pdf)

Acid-labile compounds like ethoxyquin or pymethrozine partly degrade at a pH of 5. For these pesticides trisodium citrate is used instead of the normally used citrate salt combination.
Acid-labile Pesticides (pdf)

Using citrate buffer enables the inclusion of acidic pesticides in the compound spectrum. For the acids PSA-cleanup has to be avoided, and the raw extract is directly used for analysis. Even an alkaline hydrolysis can be included to cover bond residues or esters.
Acidic Pesticides (pdf)

Analysis of Abamectin via QuEChERS and LC-MS/MS
Abamectin (pdf)

Analysis of Amitraz and its main Metabolite N-2,4-Dimethylphenyl-N-Methylformamidine in pears via QuEChERS and LC-MS/MS
Amitraz (pdf)

Modified QuEChERS-method for the Analysis of Chlorothalonil in Fruits and Vegetables
Chlorothalonil (pdf)

Analysis of Nicotine in Mushrooms via modified QuEChERS-method
Nicotine (pdf)

Analysis of Pentachlorophenol (PCP) in guar gum by modified QuEChERS-method
Pentachlorophenol (pdf)

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last update: 2011-05-15