The dependence of the transmi ttancy of a commer cial su gar liquor on the concentration of total solids does not in gf'neral foll ow Beer's law. This behavior is attributed to t he presence of apprecia ble light-scattering m aterial in t he solution. A linear dependence has been found to relate the concentration with the reciprocal of a:, the latter being; ucfincd as equal to ( -log T .) /bc, where T . is the transm ittancy, b t he cell length, and c the concentrat ion of total solids. The intercept at c= O in a plot of l /a; versus c is equal i n magn itude t.o t he limiting slope of the Beer's law plot.
The kineti cs for t he oxidation of the carbon in a cocon ut-shell charcoal, a new bone char, two service bon e cha rs, and a spent bODe char ,,'as found to be retarded firs t-order in character. The experimental data were obtain ed in a flow s." stem \y ith nitrogen-oxygen gas mixtu res at t emperatures below 400 0 C, Us ing the ini tial frac tional r ate of ox idation of t-he carbon as the cri terion of evaluation, a lineal' pl a t agains L oxygen concenLraLion was obtained for each temper ature at w hi ch the combus tion was s tud ied. Th e influen ce of temperature was expressed as the sum of two expo nenLial Arrheni us-type terms. A single re lationship ,,'as deri\'ed by combining the effects of these two variab les. This re lationship proved equall y valid when applied to all carbon adsorbellts inv csLigaled. Some reaction mechanisms " 'ere proposed t ha t \rere co nsistent wit.h thc experimental findings of the investigati on.
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