VACUUM DISTILLATION COUPLED WITH GAS CHROMATOGRAPHY MASS SPECTROMETRY FOR THE ANALYSIS OF ENVIRONMENTAL SAMPLES

摘要

A procedure is presented that uses a vacuum distillation/gas chromatography/mass spectrometry system for analysis of problematic matrices of volatile organic compounds, The procedure compensates for matrix effects and provides both analytical results and confidence intervals from a single sample analysis. Surrogate compounds are used to measure matrix effects relating to boding point and relative volatility and to provide the information necessary to accurately determine analyte concentration, Relative volatility values (alpha) are experimentally determined for 114 organic compounds and are shown to be comparable to gas-water partition coefficients. These compounds include those with boiling points up to 245 degrees C and gas-water partition coefficients less than 15 000, Multiple samples are tested, and the accuracy of determinations is shown to be within 5% for water, soil, and oil matrices, Method detection limits ape below 1 ppb for most analytes studied. [References: 8]