Study on chemical speciation of phosphorus in the desert particles of western Inner Mongolia

Abstract

Abstract The five speciation of phosphorus in the desert particles (<63 μm) of western Inner Mongolia was analyzed by sequential extraction method (SEDEX). The five speciation of phosphorus is exchangeable phosphorus (Pex), ferric iron-bound phosphorus (PFe), authigenic carbonate fluoroapatite and CaCO3 associated phosphorus (Pau), detrital apatite phosphorus (Pdet) and organic phosphorus (Porg), respectively. The results show that Pau is the main phosphorus in desert particles of western Inner Mongolia, the content of Pau in particles with natural particle size is 150-1840 mg·kg−1. The content of Pau is inversely proportional to the particle size of particles, the smaller the particle size is, and the higher the content is. Secondly, the content of Pdet was 8-480 mg·kg−1. The sum of the other two speciation of P (Pex, PFe) more easily used by living beings is 20-45 mg·kg−1, which accounts for 0.27%-8.51% of TP. Comparison of two kinds of granularity, the sequence of TP content was GanSu-Linze > Badain Jaran (Alashom youqi) > Badain Jaran (Shanga nwoer) > Wu Lan Bohe Desert (Baying-gaule) > Tengger (Azuoqi) > Badain Jaran (Batong-brige). As the source of sandstorm, particles less than 63 μm are easy to form flying dust at high altitude, floating across the eastern sea area of China to the Pacific Ocean, and transporting phosphorus over a remote distance.