Effects of elevated atmospheric CO2 on dissolution of geological fluorapatite in water and soil

The Science of the Total Environment
Zhen LiShuijin Hu

Abstract

Most of phosphorus (P) is present as insoluble phosphorus-bearing minerals or organic forms in soil. Geological fluorapatite (FAp) is the dominant mineral-weathering source of P. In this study, FAp was added into water and soil under elevated CO2to investigate the pathway of P release. Two types of soils (an acidic soil from subtropical China and a saline-alkali soil from Tibet Plateau, China) with similar total P content were studied. In the solution, increased CO2in air enhanced the dissolution of FAp, i.e., from 0.04 to 1.18ppm for P and from 2.48 to 13.61ppm for Ca. In addition, release of Ca and P from FAp reached the maximum (2.14ppm for P and 13.84ppm for Ca) under the combination of elevated CO2and NaCl due to the increasing ion exchange. Consistent with the results from the solution, CO2elevation promoted P release more significantly (triple) in the saline-alkali soil than in the acidic soil. Therefore, saline-alkali soils in Tibet Plateau would be an important reservoir of available P under the global CO2rise. This study sheds the light on understanding the geological cycle of phosphorus.

Citations

Jan 1, 2020·Environmental Science and Pollution Research International·Christopher Uche OkolieHuixin Li

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