2.5. Phosphorus adsorption capacity experiments
These experiments were conducted for the sand and
dolomite materials, using batch incubation technique
under aerobic conditions, according to OECD guideline
106 (OECD, 1981). Ten grams of each media
were equilibrated for 24 h (sufficient time as defined
during preliminary experiments and also selected for
comparison reasons since it is the phosphate equilibrium
time reported by most of the researchers for
the calcareous and sand media used in constructed
wetlands (Arias et al., 2001; Brix et al., 2001; Pant
et al., 2001; Zhou and Yuncong, 2001) with 50 ml