Evaluation of Teflon Permeation Tubes for Use with Sulfur Dioxide

Performance of a nitrogen dioxide permeation device

“…The measurement of arsenic based cln its reduction to arsine in acidic solution by NaBH, and subsequent analysis by atomic absorption spectrophotometry (AAS) has been published by several investigators (1)(2)(3)(4)(5). The use of NaBH4 as a reductant is favored since it provides many advantages over the previously employed Zn-HC1 reducing system (1).…”

“…The use of permeation devices to generate calibration gas mixtures is a fairly widely used technique (1)(2)(3)(4)(5)(6)(7). Permeation, or effusion, of a compound through a membrane will occur a t a constant rate if the ratio of the concentration of the compound on either side of the membrane is constant.…”

Syringe sampling technique for individual colorimetric analysis of reactive gases

“…regulation). Based on the results reported in the literature (O'Keeffe and Ortman, 1966;Scaringelli, Frey, et al, 1967; Thomas and Amtower, 1966) the weight loss was assumed to be due entirely to permeation of the gas through the tube. The weight os.…”

Interactions of Sulfur Dioxide with Insoluble Suspended Particulate Matter

“…7 Calibration procedures for these devices have been described. 8 The permeation tube holder and the reactor were immersed in a constant temperature (±0.1°C) water bath.…”