SAMPLING OF GASEOUS POLLUTANTS ON SILICA GEL WITH 1400 mg TUBES

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Abstract
Air sampling of organic vapours on silica gel 1400 mg tubes is a widely used technique in France (INRS and French Social Security Inspectorate) in cases where activated charcoal tubes prove unsatisfactory, especially for polar chemicals. This paper reports experiments testing the limits of use of this equipment. Trapping capacity is different for each compound, depending on pollutant concentration, and generally falls with increasing relative humidity. When two pollutants are collected simultaneously preferential fixation occurs, as with activated charcoal. Stability of the loaded tubes and the desorption solutions is generally satisfactory. Some results of the laboratory tests on 45 compounds are reported in this paper.