桂建业,张辰凌,张永涛,张莉*,齐继祥,李晓亚,田来生,赵国兴
Abstract
A simple low-cost ultrasonic extraction
procedure has been developed for determination of polar aromatic acids, polar
phenols and nonpolar pesticides simultaneously in soil. This procedure was
accomplished by in situ derivatization as well as elevated temperature,
increased power and dispersing intimate contact of solvent with samples.
Combined with GC/NCI/MS method, the sensitivity was improved remarkablely
because of the enhanced electronegativity of derivatized products of herbicide
and phenols as well as the intrinsic electronegativity of organochlorine. The
method presented here showed that the modified ultrasonic extraction method can
be a robust preparation methodology for both polar and nonpolar organic
contaminants which can be applied to solid sample pre-treatment extensively.