Effects of Sodium Carbonate Concentration on Retention Time (SI-35 4D)
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-35 4D (a column for anions analysis).
| Na2CO3 Concentration (mM) | 3 | 3.2 | 3.4 | 3.6 | 3.8 | 4 |
|---|---|---|---|---|---|---|
| F- | 3.66 | 3.58 | 3.52 | 3.47 | 3.41 | 3.36 |
| Glycolic acid | 4 | 3.87 | 3.78 | 3.75 | 3.69 | 3.65 |
| Pyroglutamic acid | 4.01 | 3.92 | 3.85 | 3.77 | 3.72 | 3.66 |
| Lactic acid | 4.03 | 3.9 | 3.8 | 3.78 | 3.72 | 3.68 |
| Acetic acid | 4.14 | 3.97 | 3.89 | 3.88 | 3.83 | 3.78 |
| Levulinic acid | 4.19 | 4.05 | 3.93 | 3.92 | 3.87 | 3.82 |
| Propionic acid | 4.4 | 4.22 | 4.11 | 4.11 | 4.04 | 3.99 |
| Formic acid | 4.51 | 4.39 | 4.17 | 4.21 | 4.15 | 4.09 |
| Butyric acid | 4.81 | 4.69 | 4.59 | 4.49 | 4.42 | 4.34 |
| Acrylic acid | 4.85 | 4.71 | 4.52 | 4.51 | 4.44 | 4.38 |
| Pyruvic acid | 4.85 | 4.72 | 4.63 | 4.52 | 4.45 | 4.37 |
| ClO2- | 5.04 | 4.9 | 4.8 | 4.71 | 4.63 | 4.54 |
| Methacrylic acid | 5.37 | 5.22 | 5.12 | 5.02 | 4.92 | 4.82 |
| BrO3- | 5.37 | 5.23 | 5.12 | 5.02 | 4.93 | 4.83 |
| Cl- | 5.71 | 5.56 | 5.44 | 5.33 | 5.24 | 5.14 |
| Valeric acid | 5.87 | 5.71 | 5.59 | 5.45 | 5.36 | 5.26 |
| NO2- | 7.04 | 6.84 | 6.69 | 6.54 | 6.42 | 6.29 |
| Br- | 9.1 | 8.83 | 8.62 | 8.41 | 8.28 | 8.09 |
| ClO3- | 9.66 | 9.36 | 9.15 | 8.92 | 8.78 | 8.56 |
| Trifluoroacetic acid | 9.77 | 9.45 | 9.17 | 8.94 | 8.76 | 8.59 |
| NO3- | 10.75 | 10.41 | 10.16 | 9.88 | 9.75 | 9.52 |
| 43-“>PO43- | 13.25 | 12.34 | 11.57 | 11.05 | 10.41 | 9.91 |
| SO32- | 14.3 | 13.32 | 12.53 | 11.89 | 11.29 | 10.67 |
| Benzoic acid | 14.31 | 13.84 | 13.42 | 13.05 | 12.77 | 12.53 |
| SO42- | 14.36 | 13.37 | 12.6 | 12 | 11.29 | 10.7 |
| Malonic acid | 15.37 | 14.35 | 13.65 | 12.61 | 12.03 | 11.41 |
| Malic acid | 15.4 | 14.37 | 13.59 | 12.61 | 12.03 | 11.42 |
| Tartaric acid | 15.74 | 14.66 | 13.93 | 12.88 | 12.28 | 11.65 |
| Citraconic acid | 15.77 | 14.79 | 13.86 | 12.97 | 12.35 | 11.76 |
| Succinic acid | 16.32 | 15.19 | 14.48 | 13.35 | 12.74 | 12.08 |
| Maleic acid | 16.36 | 15.25 | 14.4 | 13.36 | 12.75 | 12.11 |
| Adipic acid | 16.38 | 16.26 | 15.35 | 14.27 | 13.57 | 12.88 |
| Oxalic acid | 16.54 | 15.41 | 14.59 | 13.52 | 12.89 | 12.22 |
| Glutaric acid | 16.58 | 15.52 | 14.58 | 13.62 | 12.96 | 12.34 |
| Pimelic acid | 19.12 | 17.88 | 16.78 | 15.65 | 14.92 | 14.16 |
| WO42- | 21.22 | 19.72 | 18.56 | 17.61 | 16.55 | 15.64 |
| Mo42- | 22.96 | 21.34 | 20.08 | 19.02 | 17.89 | 16.92 |
| S2O32- | 23.98 | 22.26 | 20.91 | 19.79 | 18.61 | 17.58 |
| Fumaric acid | 24.87 | 23.15 | 21.71 | 20.23 | 19.23 | 18.24 |
| CrO42- | 25.22 | 23.4 | 22 | 20.8 | 19.59 | 18.49 |
| Phthalic acid | 25.98 | 24.12 | 22.67 | 20.97 | 19.95 | 18.89 |
| I- | 26.56 | 25.58 | 24.91 | 24.22 | 23.95 | 23.31 |
| SCN- | 46.36 | 44.7 | 43.65 | 42.44 | 41.96 | 41.38 |
Column : Shodex IC SI-35 4D (4.0mmI.D. x 150mm) Eluent : Na2CO3 aq. Flow rate : 0.6mL/min Detector : Suppressed conductivity Column temp. : 45°C
