Phosphorus content and fractionation of phosphate in the surface sediments of the Daliao river system in China

摘要: The Daliao river system in China has been seriously affected by long-term intensive industrial, urban and agricultural activities. objectives of this study were to determine the total phosphorus (TP) content forms phosphate sediments investigate geochemical relationships between P sediment mineral phases. Twenty-seven samples surface collected analyzed for major elements. Chemical measured sequential selective extraction method. Results indicate that TP averaged 703 mg kg−1, range from 206 1,342 kg−1. tributaries near cities contained high TP, due discharge municipal industrial effluents. distribution various phases followed order: Ca-P > RES-P RS-P Fe-P Al-P S/L-P Hun Taizi river, river. Fe Ca contents positively correlated associated (Fe-P RS-P) Ca-P, respectively. In addition, organic matter, sediments. However, Al was not or Generally, contaminated effluents tidal zone more bioavailable P. Possible release these overlying water might pose potential risk on estuarine eutrophication.