A Modified Sequential Extraction Method for the Determination of Phosphorus Fraction in Sediment
YANG Bin
WANG Ting
WANG Kun
JIANG Xia
WANG Shuhang
LI Da
Abstract：A sequential extraction method for phosphorus was modified according to modified Tessier sequential extraction sequential,to increase extraction rate of Fe bound P and A1 bound P,and to analyze organic P and inorganic P in sediments simultaneously.The extraction sequence in optimal modified sequential extraction method for P was as loosely adsorbed P,authigenic carbonate bound P (pH=5.0),Fe bound P,A1 bound P,detrital apatite P and residue P.Extraction rate of Fe and A1 through the optimal modified sequential extraction method for P is higher than sequential extraction method un-modified.Concentration of authigenic carbonate bound P determined by the optimal modified sequential extraction method is similar to that determined by un-modified sequential extraction method.Difference was observed between liable organic phosphorus concentration,as well as resistant organic phosphorus concentration,obtained from the optimal modified sequential extraction method and that obtained from modified Bowmen-Cole method.Nevertheless,concentration of moderately liable organic phosphorus,the largest proportion of organic phosphorus,determined by the optimal modified sequential extraction method is similar to that determined by modified Bowman-Cole method.Significant difference was not found between proportion of bio-available phosphorus in the total phosphorus of surficial sediments collected from Dongting Lake estimated based on the optimal modified sequential extraction method and proportion estimated according to un-modified sequential extraction method.
Keywords：sedimentsequential extraction methodinorganic phosphorusorganic phosphorusfraction
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 90-97 )