Analysis of Pyrophosphate and Tripolyphosphate

To separate pyrophosphate(H₂P₂O₇^2-) and tripolyphosphate (H₃P₃O₁₀^2-) by ionexchange, an acidic eluent where they have a low ionic value is employed.


Sample : 150mg/L each, 100micro-L
1. H₂P₂O₇^2-
2. H₃P₃O₁₀^2-

Column       : Shodex IC NI-424 (4.6mmID*100mm)
Eluent       : 8mM H2SO4 + 0.04mM EDTA･2Na aq.
Flow rate    : 1.0mL/min
Detector     : Shodex RI
Column temp. : 40deg-C