engleski

Significance of the quality of florisilR in organochlorine pesticide analysis

During the analysis of chlorinated pesticides in animal fat tissue applying the matrix solid-phase dispersion method, and notwithstanding the use of a gas chromatograph with a highly selective capillary column, two peaks occur: one with a retention time very similar to that of lindane, and the other almost identical to that of dieldrin. Repeated analyses of the same sample with a GC/MS system revealed that neither lindane or diledrin were present. It was proven that those peaks resulted from florisil of local origin used for analysis, but not from the original FlorisilR. The removal of the first peak ("lindane") was possible through heating of florisil of local origin at 680 0C for 4 hours, whereas some other method would be required for the removal of the other peak ("dieldrin"). The incident proved that, in such demanding analyses, it is extremely important to use original, high quality substances to avoid possible interference and misinterpretation of results.

dieldrin; GC/MS identification; lindane; multiresidue extraction

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