Polyphosphoric Acids (I-524A)

Anion standards were analyzed using IC I-524A. This eluent
is suited to the separation of three kinds of acids, phosphoric acid(H₂PO₄^–),
pyrophosphoric acid(H₂P₂O₇^2-)
and tripolyphosphoric acid(H₃P₃O₁₀^2-).
EDTA-2Na is added to prevent the complexation of ferrous ion with polyphosphoric
acids.

s0815b

Sample : 50?L

1. H₂PO₄^– 20mg/L

2. H₂P₂O₇^2- 50mg/L

3. H₃P₃O₁₀^2- 50mg/L

Column : Shodex IC I-524A (4.6mmID*100mm)
 Eluent : 5mM Trimesic acid + 0.04mM EDTA-2Na
 Flow rate : 1.2mL/min
 Detector : Non-suppressed conductivity
 Column temp. : 40°C