지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
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초록· 키워드
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The adsorption capacity of charcoal is a function of the airborne concentration of the target chemical. To evaluate the adsorption capacity of charcoal packed in the cartridges of air purifying respirators, breakthrough tests were conducted with carbon tetrachloride for three commercial cartridges (3M models #7251, #6000 and AX) at 25, 50, 100, 250 and 500 ppm. Adsorption capacities were calculated using a mass transfer balance equation derived from the curve fitting to the breakthrough curves obtained experimentally. Carbon micropore volumes were estimated by iteration to fit the Dubinin/Radushkevich (D/R) adsorption isotherm. They were 0.6566, 0.5727 and 0.3087 g/cc for #7251, #6000 and the AX cartridge, respectively. Above 100 ppm (at high challenge concentrations), #7251 and #6000 showed higher adsorp-tion capacities. However, as the challenge concentration decreased, the adsorption capacities of #7251 and #6000sharply dropped. On the other hand, the adsorption capacity of the AX cartridge showed little change with the decrease of the challenge concentration. Thus, the AX showed a higher adsorption capacity than #7251 and #6000 at the 5-50 ppm level. It is concluded that service-life tests of cartridges and adsorption capacity tests of charcoal should be con-ducted at challenge concentration levels reflecting actual working environmental conditions. Alternatively, it is rec-ommended to use the D/R adsorption isotherm to extrapolate adsorption capacity at low concentration levels from the high concentration levels at which breakthrough tests are conducted, at a minimum of two different concentration levels.
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참고문헌 (24)
참고문헌 신청
American Conference of Governmental Industrial Hygienists (ACGIH) / 2010 / 2010 TLVs and BEIs / ACGIH
American National Standards Institute / 1992 / American National Standard Practices for Respiratory Protection (ANZI Z88.2-1992) / American National Standards Institute, Inc
Cohen, H. J. / 1991 / Development of a field method for evaluating the service life of organic vapor cartridges-Part III : Results of laboratory testing using binary mixtures
Dubinin, M. M. / 1975 / Physical adsorption of gases and vapors in micropores / Progress Surface Membrane Science 9 : 1 ~ 70
European Committee for Standardization (CEN) / 1990 / CEN European Respirator Standards / CEN
American National Standards Institute / 1992 / American National Standard Practices for Respiratory Protection (ANZI Z88.2-1992) / American National Standards Institute, Inc
Cohen, H. J. / 1991 / Development of a field method for evaluating the service life of organic vapor cartridges-Part III : Results of laboratory testing using binary mixtures
Dubinin, M. M. / 1975 / Physical adsorption of gases and vapors in micropores / Progress Surface Membrane Science 9 : 1 ~ 70
European Committee for Standardization (CEN) / 1990 / CEN European Respirator Standards / CEN
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