Effects of Sodium Carbonate Concentration on Retention Time (SI-90 4E)

Effects of Sodium Carbonate Concentration on Retention Time (SI-90 4E)

Please use this column with suppressor type ion chromatography system.

The concentration of sodium carbonate (Na₂CO₃) in eluent influences the retention of some anions
when analyzed by IC SI-90 4E
(a column for anions analysis). The relationship between sodium
carbonate concentration and anions’ retention time is shown below.
Elution volumes of anions from fluoride to nitrate are not influenced
considerably by the change in sodium carbonate concentration. While
retention volumes of later eluting anions (phosphate to iodide ion) are
shorten by increasing the sodium carbonate concentration.

Sample : 20?L
F^– 2mg/L
Cl^– 3mg/L
NO₂^– 5mg/L
Br^– 10mg/L
NO₃^– 10mg/L
HCO₃^– 300mg/L
PO₄^3- 15mg/L
SO₄^2- 15mg/L
I^– 10mg/L

Column : Shodex IC SI-90 4E (4.0mmI.D. x 250mm)
 Eluent : Na2CO3 + 1.7mM NaHCO3 aq.
 Flow rate : 1.0mL/min
 Detector : Suppressed conductivity
 Column temp. : 25°C