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Effect of pH on Retention Time (1) (I-524A)

Anion standards were analyzed using IC I-524A. This figure shows the effect of pH on retention time with a 2.5mM phthalic acid eluent. Generally, the retention time decreases with the increase of pH. A sharp peak of MoO42- cannot be obtained below pH5.0, neither CrO42- below pH6.0, nor H2PO4- can be obtained above pH4.2 or F- above pH4.5.


Sample :
Br-
Cl-
F-
I-
NO3-
NO2-
ClO4-
H2PO4-
SO42-
SCN-
S2O32-
MoO42-
CrO42-

Column       : Shodex IC I-524A (4.6mmID*100mm)
Eluent       : 2.5mM Phthalic acid(pH variable)
Flow rate    : 1.2mL/min
Detector     : Non-suppressed coductivity
Column temp. : 40deg-C