Fig. 5. Amount of phosphate slowly immobilized versus fractional PGA-C release after 2 wk. The amount of phosphate slowly immobilized was calculated as the difference between the total amount of phosphate sorbed after 2 wk and the total amount sorbed fast (c_m of Eq. [2]). Figures after ‘G’ refer to the rounded C content of the sample in milligram C per gram. Error bars represent standard error.