An Automatic Atmospheric Fluoride Analyzer With Potential Application to Other Pollutants |
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| Authors: | Donald F Adams Robert K Koppe Homer J Dana |
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| Institution: | Industrial Research Division , Washington State Institute of Technology, State College of Washington , Pullman , Washington , USA |
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| Abstract: | The “dichromate” paper developed by Ripley, Clingenpeel, and Hum was used successfully in our laboratory for conversion of nitric oxide to nitrogen dioxide at concentrations up to the 1 ppm level. When this p aper was used for synthetic mixtures with nitric oxide concentrations in the range of 1—3 ppm, the analyses were erratic and values were lower than calculated. After a number of modifications of the procedures for preparing and using the impregnated paper, a modification of the “dichromate” paper was achieved that reduced scatter in the NO analysis and improved conversion efficiency. The efficiency and reproducibility of the modified paper are good enough that efficiency factors may be established to correct data obtained over a period of at least ó hours of continuous use at relative humidities (RH) near 50%. |
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