Abstract
The applicability of a closed-loop gas-phase stripping apparatus for the determination of trace organics in water was evaluated. Recoveries were determined for a series of n-alkanes. The effects of extraction solvent, stripping temperature, stripping time, pH and salt content on the closed-loop system were investigated. Carbon disulfide was found to be the best extraction solvent, and an extraction temperature of 40°C was found to be optimal. Two water samples spiked with 0.1–0.2 and 1.0–2.0 μg/1 of each U.S. Environmental Protection Agency base neutral priority pollutant were investigated. Recoveries for the base neutrals of the more concentrated sample were determined at 25 and 40°C. A direct comparison of the closed-loop gas-phase stripping method and the purge-and-trap method with Tenax GC was performed on a river water sample. Recoveries for the thermal desorption of base neutrals from Tenax were determined at five different desorption temperatures. A new microextraction vessel, which allows the use of solvents heavier than water, was constructed and evaluated. Distribution coefficients and recoveries for compounds of different functionalities were determined at three different water to solvent ratios and at concentration levels of 100 ppb★ and 0.5 ppm.
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