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1 ASSESSMENT OF AMMONIA ADSORPTION ONTO TEFLON AND LDPE TUBING USED IN POLLUTANT STREAM CONVEYANCE

By A. J. Rose, S. C. Capareda, C. N. Boriack, R. E. Lacey and B. W. Shaw

Abstract

The adsorption of ammonia onto polymer tubing used in pollutant stream conveyance was assessed for possible systematic losses. An experimental design with three replications of 32 trials was completed to investigate the adsorption of ammonia based on two nominal temperatures (25 and 37 o C), two nominal tubing lengths (15 and 46 meters), six nominal inlet concentrations (2, 5, 10, 15, 25, and 35 parts per million), and two tubing materials, (Teflon and low density polyethylene,LDPE). For a given length, mean ammonia adsorption on Teflon tubing was found to be statistically less than that from LDPE. The effect of tubing length on ammonia adsorption was not significant for Teflon, but was significant for LDPE. There were significant differences between inlet and outlet concentrations of LDPE at nominal inlet concentrations of 5 and 15 ppm (α=0.05). Overall, ammonia adsorption to Teflon was approximately 1 ppm regardless of the magnitude of inlet concentration. This loss on to the Teflon surface was well within the measurement sensitivity of the ammonia analyzer. Ammonia adsorption onto LDPE tubing increased with increasing inlet concentration, temperature and length of the tubing

Topics: Adsorption, Teflon, LDPE
Year: 2011
OAI identifier: oai:CiteSeerX.psu:10.1.1.199.5780
Provided by: CiteSeerX
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