Fig. 1. Relationship between citrate adsorbed, P released, and Fe dissolved over time for citrate-induced P desorption from ferrihydrite at pH 4.0, 0.013 M citrate, and 7.14 g ferrihydrite L^–1. The initial P/citrate/P-adsorption maximum ratio was 0.25:1:1. Each data point represents the mean of three replications, with error bars representing standard error.