Fig. 5

Standardized decay curves of alpha-pinene under active conditions after passing the adsorbent beds. Adsorbent media are representatively selected for each sorbent group. Occurred breakthrough after 24 h, 30 h and 48 h is marked with an asterisk. PC1: pure activated carbon (unimpregnated coconut shells), IC7: charcoal impregnated with NaMnO₄, CC10, alkaline impregnated charcoal cloth, Z6: synthetic zeolite (type X crystal), SG2: silica gel (90% SiO₂; lithium chloride). For further information, refer to Table 3