Report for Analytical Chemists
versions take place within the solid, its release rate of emanation mea sured at room temperature is di rectly proportional to specific sur face area Ε — k · S. This is the principle of the emanation method employment to the study of aging of precipitates (1) or study of powder materials sintering at elevated tem peratures {25). The utilization of the emanation method is advantageous for the continuous qualitative observation of specific surface changes under
experimental dynamic conditions. The reactivity and sintering ac tivity of ferric oxide obtained by thermal decomposition of various iron salts at different temperatures were studied by means of the ema nation method in our laboratory {26). As shown in Figures 14a and b, emanation release curves of Fe 2 0 3 prepared from different iron salt at 1100°C differ. This is more clearly demonstrated in the graph plotted in semilogarithmic coordinates —
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Figure 14. Temperature dependence of the emanation release of « = Fe 2 0, prepared from different iron salts during heatingtollOO°C (26) (a) Coordinates: a) χ = Τ, y = Ε = f(T); b) χ = 1/Τ, y = log Ed = f (1/T) Γ } _, . m , t l a l l r o n , s a l t s w e r e taken: iron carbonate (curve 1 and Π ) , ferrous sulfate heotahydrate (curve 2 and · ) , Mohr's salt (curve 3 and O ) , and ferrous oxalate dihydrate J (curve 4 and ψ)
ANALYTICAL CHEMISTRY, VOL. 4 2 , NO. 9, AUGUST 1 9 7 0
