东江惠州段干流及支流沉积物中磷的形态分布特征

ontents and distributions of different forms of phosphorus were determined for 19 surface sediments collected from Dongjiang river and its tributaries in Huizhou, China, in March 2011. Forms of phosphorus in sediments were analyzed using the Standards Measurements and Test (SMT) procedure of phosphorus forms in freshwater sediments. Results showed that the concentration of Total Phosphorus(TP) in the sediments ranged from 576.3 mgokg-1 in XK3 to 2627.3 mgokg-1in XK2. The Inorganic Phosphorus(IP) was the dominant portion of phosphorus, whose concentration ranged from 275.0 mgokg-1 to 2738.2 mgokg-1, accounting for 42.6% to 104.2% of TP. The Organic Phosphorus(OP) concentration was 146.5~417.7 mgokg-1，accounting for 11.3%~45.5% of TP. Phosphorus bound to Fe/Al oxides and hydroxides(NaOH-P), which was the active species ,ranged from 216.0 mgokg-1 to 2329.5 mgokg-1 accounting for 76.6%~111.9% of IP. Space distribution of TP and Inorganic phosphorus forms showed a trend of being higher in the tributaries than in the Dongjiang river. The potential of phosphorus release from Dongjiang River sediments to water bodies was significant The NaOH-P concentration was positively correlated to the content of active Fe、Al.