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. 1998 Nov;64(11):4168–4173. doi: 10.1128/aem.64.11.4168-4173.1998

FIG. 3.

FIG. 3

Ethylene concentration at different soil depths of the biofilter after operation with 2.05 ppm of C2H4 for 1 h, 5 days, and 16 days. Soil depths of 0 and 35 cm represent the biofilter inlet and outlet, respectively.