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By Samuel Butcher (Auth.)

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Calculate the average concentration of S 0 in p p m and the concentration of S O 4 in M g / m , assuming complete oxidation of the S 0 . Assume a wind speed of ( a ) 5 k m / h r ; ( b ) 35 k m / h r . Derive E q . ( 1 . 1 6 ) . State all assumptions. A t what points in the b o x shown in Fig. 9 would y o u expect this approximation to be most valid? 2 - 3 2 3. REFERENCES Berkner, L. , and Marshall, L. C. (1964). In " T h e Origin and Evolution of the Atmospheres and Oceans" ( P . J. Brancazio and A.

J. (1969). Environ. Sei. Technol. 3, 1181. Geophys. Res. Healy, T. , M c K a y , H . A. , and Scargill, D . (1970). 7 5 , 2317. 24 1 INTRODUCTION LaHue, M . D . , Pate, J. , J. P. (1970). Geophys. Res. 7 5 , 2922. , and Hughes, E. (1970). Science 1 6 8 , 1582. Mason, B. J. (1957). " Oxford Univ. Press (Clarendon), London and New Y o r k . Rubey, W . W . (1951). Bull. Geol. Soc. Amer. 6 2 , 1111. Slade, D . H . (1968). S. A t . Energy C o m m . , Oak Ridge, Tennessee. S M I C (1971). Inadvertant climate modification.

Frequently, the dilutions must be carried out in t w o or more stages in order t o obtain concentrations at the p p m level. T h e gas mixture may be stored in a cylinder under pressure. T h e method of storage m a y be determined b y the t y p e of analytical instrument used and the v o l u m e of gas required for calibration. The dynamic method was proposed b y L o v e l o c k (1960) for the calibration-of gas chromatographs. T h e dilution apparatus is shown in Fig. 18. 5) ut/V 0 where V is the volume in which the mixing occurs and U is the flow rate of pure air into the mixing flask.

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