This report WM prepared an an account of Government sponsored work. Neither the Ulllted Bwics, U~J he Gu~llulisJhr~~, UUI m y plwn UIS Ln.Iduf Q~C Cbuuu&orl. A. Makes any warranty or representation, expressed or implied, with respect to the accuracy, completeness, or usdulness of the information contained in this report, or that the use of any information, apparatus, method, or p r o w W o s e d in this repon may not mntnnge gtrvtite1p m e d nightg; tif B. Assumes m y liabilities with respect to the use OK or for damage3 m u l l i~g Gum (he use of m y informatinn, apparatus, method, or proccas disclosed in this report. As used in the above, "person acting on behalf of the Commission" includes any employee or contractor of the Commission, or employee of such contractor, to the extent that.such employee or contractor of the Commission, or employee of such contractor prepar~~, d i w m i n i t t~, nr providmi GEM to, any information pwuant. ta hk ernployment or contract with the Commission, or his employment with such contractor.
Cationic interactions in flame photometry were investigated to study some of the factors that cause enhancements of spectral lines. Interactions of the alkali and alkaline earth metals in an oxygen-acetylene flame have indicated that several mechanisms may be responsible for enhancement Where conditions are proper, enhancements of emissions of cations may be a combination of at least three factors a) the effect of electron concentration from an easily ionized extraneous element on the ground state population of the test element, b) the effect of transfer of energy by radiation and c) the effect of transfer of energy due to collisions with excited atoms The effect of the electron concentration on the suppression of the ionization of the test element was the predominant mechanism by which enhancement occurred in most systems studied. However, in the study of the effect of potassium on rubidium direct evidence was obtained of excitation by transfer of radiant energy Indirect evidence of enhancement due to transfer of energy by collision also was observed in the same system.
Describes principal characteristics of thermoplastics currently used for corrosion resistance. Some of the advantages of plastic piping over metallic piping are discussed. Types of plastic materials described briefly include polyethylene, ABS, cellulose acetate butyrate, vinylidene chloride, PVC and chlorinated polyether. Also describes plastic lined steel pipe, joints, fittings and valves. Additional data given on PVC. case histories given on service of PVC with illustrations of several installations. 6.6.8
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