Hl. Golterman, FRACTIONATION OF SEDIMENT PHOSPHATE WITH CHELATING COMPOUNDS - A SIMPLIFICATION, AND COMPARISON WITH OTHER METHODS, Hydrobiologia, 335(1), 1996, pp. 87-95
The NTA/EDTA fractionation of sediment-bound, inorganic phosphate was
improved and made more effective. The iron-bound phosphate is now extr
acted with Ca-EDTA plus dithionite and followed by an extraction of ca
lcium-bound phosphate by Na-2-EDTA at pH = 4.5. A comparison is made w
ith two other sequential extraction procedures: the SEDEX and the Hiel
tjes & Lijklema extractions. The EDTA extractions have an advantage ov
er the other two methods.