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The availability of P is often insufficient and limited by accumulation in soils. This led tothe necessity of solutions for the recovery as well as recycling of secondary P resources. Batchexperiments were conducted with CaCl2 and citric acid to characterize P release kinetics fromvivianite, hydroxyapatite, and bone char. While the P release during the CaCl2 treatment was solow that only vivianite and hydroxyapatite showed a slightly higher release with increasing CaCl2concentration, thedoi:10.3390/soilsystems4010015 fatcat:sglptpzberhanp2w4z6sls22je