유기용제용 시료채취기 개발을 위한 활성탄 성능검정에 관한 연구

Abstract

It has been tried to develop passive samplers for organic solvents in Korea. The structure and principle of the charcoal tube and passive samplers is very simple. However, it is critical to select and pack the suitable charcoal to obtain good performance. Adsorption capacity for the charcoal were tested in this study to verify the performance of them for the use of the sampling media in industrial hygiene field. Two set of experiments were conducted. The first experiment was to test performance of the tested charcoal that were assembled in the laboratory with the use of the GR grade charcoal. The other tests were investigate the adsorption capacity of the charcoal tested in this study and charcoals embedded in the commercial charcoal tubes. Known air concentration samples for benzene, toluene, and o-xylene were prepared by the dynamic chamber. 1. At low air concentration levels (0.1 x TLV), there was no significant differences between the tested charcoal tubes and the SKC charcoal tubes. This implies that there is no defect with the adsorption capacity of the charcoal. 2. At high concentration with 60 minutes sampling, the breakthrough were found only in the tested charcoal while no breakthrough were shown in the SKC charcoal. In the tested charcoal, benzene were pass through to the back section of the tested charcoal tube. 3. From the breakthrough tests for the charcoal, the micropore volume (Wo) were calculated by the curve fitting with the use of Dubinin/Radushkevich(D/R) mass balance equation. The calculated values were 0.687 cc/g for the SKC, 0.504 cc/g for Sensidyne, and 0.41 9 cc/g for the tested charcoal(Aldrich). 4. Adsorption capacities were obtained from the isotherm curves shown adsorption capacities at several levels of the challenge concentration. All range of the air concentration concerned in industrial hygiene, the SKC charcoal showed approximately two times of adsorption capacity compared to the tested charcoal.