A Design Basis for Lead Dioxide Cylinders

Calibration factors and estimation of atmospheric sulfur dioxide and fluoride by use of solid absorbents

“…However, since seasonal fluctuations in the calibration factors were not apparent (Table III), it is felt that such fluctuations have a minimal effect on the calibration factors. This observation is in agreement with the findings of previous workers (15,16). Factors i-iii, then, can be considered to raise the baseline uncertainty from 5.5 to 9.3% for SO2 and 18.4% for fluoride.…”

A cylindrical lead dioxide diffusion tube for separating sulfur dioxide from an airstream

“…When unbleached softwood kraft pulp (kappa number -32) is treated with chlorine under standard bleaching conditions, ~20-25 kg of organic material per ton of pulp is dissolved into the chlorination liquor (5). A large number of compounds with a broad distribution of relative molecular mass and chemical nature constitute the dissolved organic material.…”

“…Several different types of cylindrical S02 strippers were tested: (1) Pb02 powder behind mesh, (2) anodized lead foil, (3) Pb02 deposited electrochemically from Pb(NOa)2 solution onto stainless-steel foil, (4) Pb02 paste using Elmer's glue, (5) Pb02 paste using gum tragacanth, (6) LiOH impregnated into filter paper, (7) Pb02-alcohol slurry deposited on a glass tube, (8) Mn02 of various mesh sizes behind mesh, and (9) activated charcoal packed behind mesh.…”

“…Strippers have also been used to measure the amount of stripped-out material. Hickey and Hendrickson (5) have summarized the results of several studies in which Pb02 cylinders (generally Pb02-gum tragacanth mixtures applied to a cylindrical form) were used to measure the amount of S02 in air. They found from their own experiments that the smaller the grain size of the Pb02 used the higher the rate of absorption of S02 and the higher the critical loading or absorptive capacity of Pb02 reacted.…”