Table of Anion Retention Time under Various Eluent Conditions (SI-90 4E)

Please use this column with suppressor type ion chromatography system.

Common anions were analyzed with anion analysis column, IC SI-90 4E , under different eluent conditions. Result is summarized in the table.

  • (1)Optimal/recommended condition: 1.8mM Na2CO3 + 1.7mM NaHCO3 aq.
  • (2)For sample containing high carbonate concentration or for high sensitivity analysis: 1.0mM Na2CO3 + 4.0mM NaHCO3 aq.
  • (3)Eluent of strongest retention among 3 conditions: 12.0mM NaHCO3 aq.
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Substances

Retention Time (min)
Eluent (1) Eluent (2) Eluent (3)
F-   3.5   3.9   4.7
Acetic acid   3.7   4.2   5.1
Formic acid   4.0   4.5   5.6
ClO2-   4.2   4.8   6.3
Methacrylic acid   4.3   4.9   6.4
BrO3-   4.4   5.1   6.7
Cl-   4.7   5.5   7.2
NO2-   5.3   6.3   9.0
Br-   6.4   7.6 11.5
ClO3-   6.3   7.8 12.0
NO3-   7.1   8.8 13.4
HPO42- 11.3 15.0 14.1
SO32- 12.7 18.2 27.5
SO42- 13.1 18.4 27.2
Oxalic acid 14.6 20.6 30.7
I- 14.7 19.8 34.4
WO42- 17.6 25.1 38.2
MoO42- 19.0 27.1 42.0
S2O32- 18.5 26.4 42.5
CrO42- 20.0 28.9 48.0
SCN- 23.8 33.8 66.6
Column
：Shodex IC SI-90 4E (4.0mmI.D. x 250mm)
Eluent
：(1); 1.8mM Na2CO3 + 1.7mM NaHCO3 aq.
(2); 1.0mM Na2CO3 + 4.0mM NaHCO3 aq.
(3); 12mM NaHCO3 aq.
Flow rate
：1.0 mL/min
Detector
：Suppressed conductivity
Column temp.
：25 ℃

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