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KMID : 0386819960060010071
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Journal of the Institute of Health Environmental Sciences
1996 Volume.6 No. 1 p.71 ~ p.78
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A Study on the Simple and Rapid Multiresidue Screen Method for Organophosphorus, Organochlorine, and N-Methyl Carbamate Insecticides in Plants
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Abstract
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A multiresidue method(MRM) for insecticides is an efficient way to screen a large number of samples for multiple pesticides in a relatively short time period.
There are numerous MRMs testing for a single class of compounds such as organophophorus(OP), organochlorine(OC), n-methyl carbamate(MC) insecticides, but few screen for screen for these insecticides with a single sample extraction.
The main objective of the use of MRMs is to determine as many pesticides of different chemical structure as possible in various types of samples of known or more often of unknown origin in a single procedure.
The proper application of MRMs requres knowledge of extractability of different compounds from various types of samples, the distribution properties in solvent systems of different polarity, elution patterns in column chromatographic systems, the
loadability and selectivity of chromatographic separation and the specificity and sensitivity of detection.
For the determination of pesticide residues such a multitude of methods has been described that a complete survey of literature is very difficult for the analyst. However, by far the majority of these methods consist of a few working steps such
as
extraction with a limited number of solvents, liquid-liquid partitioning, adsorbent column chromatography or gel permeation chromatography and the determination, mostly with GLC, TLC, or HPLC.
For the various pesticides groups they differ only in some details (e.g. amount and activity of obsorbents, composition and polarity of solvent mixtures) selected according to the attributes of the residues to be analysed and the co-extractives
to
be
separated.
The objective of this paper is to give some guidance on the application of the various processes used in the general scheme of MRMs by comparing some well established methods covering a wide range of pesticides.
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