Phosphorus fractions and phosphate adsorption characteristics analysis of Xuanwu Lake sediments

摘要

Phosphorus fractions and phosphorus adsorption characteristics of Xuanwu Lake sediments were analyzed. In this study, according to the Standards, Measurements and Testing (SMT) protocol, the sediment phosphorus is fractionated into Conc. HCl-P, NaOH-P, HCl-P, organic P (OP), inorganic P (IP). The results show that the Conc. HCl-P content in the sediments ranges from 567.89 to 1196.89 mg kg-1.The biologically available phosphorus (BAP) ranges from 181.15 to 658.69 mg kg-1 in the Xuanwu Lake sediments. The content of native adsorbed phosphorus NAP ω varies greatly from 15 to 79.6 mg.kg-1 and zero equilibrium phosphorus concentration EPC C ranges from 0.0922 to 0.367 m g﹒L-1.After the external load is reduced, the inherent phosphorus present in sediments will be a major threat to the water quality and be a predominant factor determining the trophic status of the lake.