Effects of linear flow velocity and residence time on the retention of non-polar aqueous organic analytes by cartridges of tenax-gc

Trace organic compounds in rain. 4. Identities, concentrations, and scavenging mechanisms for phenols in urban air and rain

“…Such behavior is expected if sorption on the bed is diffusion limited, though under the conditions used here if such mass transport in the bed was the only factor influencing sorption, Rx should have been near 0.85 as expected for strongly sorbing compounds (25,26). Under diffusion limitation, the fraction R of the analyte that passes onto a cartridge and is retained is constant for each cartridge and is set by the bed hydrodynamics (26).…”

“…Recovery Experiments. Tenax-GC exhibits excellent retention of many nonpolar aqueous compounds (25,26). For phenols, however, there can be substantial breakthrough.…”

An injection olfactometer for humans and a new method for the measurement of the shape of the olfactory pulse

“…-77-1148); it is suitable for preconcentration of high boiling compounds, such as amines, alcohols, aldehydes, ketones, and aromatic compounds, on a gas chromatograph. Nonpolar organics can be retained as well (Pankow, Isabelle, & Kristensen, 1982). A Tenax measurement is started when solenoid G is operated and the full amount of odor/air flow that leaves the olfactometer is led through a pair of Tenax tubes.…”

Sample Preparation for Chromatographic Analysis

“…To obtain accurate analytical data at trace concentrations careful attention to procedural details is essential [9,176,[179][180][181][182][183][184][185][186][187]. Prior to use the polymeric beads must be prewet to promote complete permeation of the water into all of the pores of the polymer, and the adsorbent column must be operated so that the sample passes through these pores.…”

“…The column is first washed with several bed volumes of a water miscible solvent, such as methanol, followed by several bed volumes of pure water. In spite of these limitations its use in studies of water pollution involving trace concentrations of organic compounds has been demonstrated [184,185]. The column bed should be long and narrow to avoid poor recovery resulting from channeling of the water flow and packed with coarse beads (0.85-0.35 mm) to facilitate rapid sampling by gravity flow or forced flow using a peristaltic pump.…”