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).
 

Substances

Retention Time (min)
Conc. of Na2CO3 (mM)
3.0
3.2
3.4
3.6
3.8
4.0
F-
3.66
3.58
3.52
3.47
3.41
3.36
Glycolic acid
4.00
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
3.90
3.80
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
4.40
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
4.90
4.80
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-
9.10
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
HPO42-
13.25
12.34
11.57
11.05
10.41
9.91
SO32-
14.30
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
12.60
12.00
11.29
10.70
Malonic acid
15.37
14.35
13.65
12.61
12.03
11.41
Malic acid
15.40
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
14.40
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
MoO42-
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
23.40
22.00
20.80
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
44.70
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℃

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