Tap Water (1) (YK-421)
Cations in tap water were analyzed using IC
YK-421. At present, ion chromatogaraphy is not used for in Japanese regulations
for tap water. However, ion chromatography is very
useful method for the simultaneous analysis of monovalent and divalent cations
such as Na
+,
K
+ and Mg
2+.
Sample :
Tap water (
Water)
1.
Li+
2.
Na+
3.
NH4+
4.
K+
5.
Ca2+
6.
Mg2+
| Cations |
Current regulation |
Analyses by Shodex IC YK-421 |
Detection
limit
(S/N=3) |
Reproducibility(N=5) |
| Mean value |
CV(%) |
|
Na+
|
less than 200mg/L
(Flameless atomic adsorption
spectrophptometory or ICP) |
Na+ 1.5 micro-g/L
|
11.3mg/L |
1.2 |
|
Ca2+
|
less than 300mg/L
(Titration method) |
Ca2+ 3.0 micro-g/L
|
15.2mg/L |
0.95 |
|
Mg2+
|
Mg2+ 1.5 micro-g/L
|
4.9mg/L |
1.5 |
Column : Shodex IC YK-421 (4.6mmID*125mm)
Eluent : 5mM Tartaric acid + 1mM Dipicolinic acid + 1.5g/L Boric acid aq.
Flow rate : 1.0mL/min
Detector : Shodex CD
Column temp. : 40deg-C
