ABSTRACT
Solid supported processes are a standard approach to simplifying sample preparation for determination of organic contaminants in the environment and are almost a standard feature of many such analytical procedures. Separation of analytes from interferences has carried out on normal phase supports such as silica gel. In addition to these chromatographic techniques, solid supported reactions were used effectively in the determination of stable compounds such as dioxins or polychlorinated biphenyls. In addition to the simplifying manual techniques, solid supported processes have also been preferred in automated systems for sample preparation. The principal reactions reported to date for purposes of gas chromatographic determination of parent herbicides and corresponding phenols are pen-tafluorobenzylation as well as silylation with cyano-containing reagents. Development of analytical techniques for determination of herbicides and related compounds requires that several distinct problems be addressed. First, the herbicides are carboxylic acids, but the degradation products are phenols and both functionalities must be derivatized.
