?GC ANALYSIS OF CHLORINATED CATECHOLS IN SOILS BY INTERNAL STANDARD METHOD

Abstract

An improved gas chromatography (GC) analysis method, was developed with seven chlorinated catechol com-
pounds in soils. Six solvent systems were tested by a shaking method of extraction. The method include extraction,
mixing with internal standard 2,6·dimethoxyphenol, then derivatization with pentafluorobenzyl bromide, cleanup by
water-toluene shaking and then injected to Gc. The recovery yields varied largely from 67 to 90% within six solvent sys-
tems. Two solvent system: Diethykther-hexane-acetoneheptane (3:3:2:2:) and hexane-heptane-chloroform (1:1:1:)
gave the highest yields in both soils. The standard deviations and t-test were applied to the results where some significant
variations were also recorded.