Get Procedure For Sampling Foliage For Pesticide Residue. Standard Operating Procedure - Cdpr Ca

Gas chromatography–mass spectrometry (GC–MS) has been the predominant technique for the confirmation of pesticide residues in the past. Relatively inexpensive bench-top instruments have made the technique more widely available for routine screening in recent years.

Steps in Pesticide Residue Analysis. Determination of pesticide residues was generally performed in seven steps: sampling, sample preparation, sample size reduction, sample processing, extraction and cleanup, and instrumental determination (Fig. 1).

The pesticide residues are usually analyzed by the following methods: Gas Chromatography – Mass Spectrometry Coupled (GC-MS), especially for volatile compounds in complex samples. Liquid Chromatography – Mass Spectrometry Coupled (LC-MS), suitable for non-volatile compounds (thermally unstable molecules)

Liquid-liquid extraction (LLE) has mostly been used for the extraction of pesticide residues in aqueous or commodities having low quantity of fats such as fruits, vegetables and soils. In liquid-liquid extraction, a sample is mixed with polar and a non-polar organic solvent resulting in two immiscible solvent system.

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Traditional pesticide residue detection methods generally include gas chromatography–mass spectrometry (GC-MS), liquid chromatography–mass spectrometry (LC-MS), and high-performance liquid chromatography–mass spectrometry (HPLC-MS) [5].