Cations in tap water were analyzed using IC YK-421. Ion chromatogaraphy is used for in Japanese regulations for tap water. Ion chromatography is very useful method for the simultaneous analysis of monovalent and divalent cations such as Na+, K+ and Mg2+.

Sample: 15 µL
Std. solution

  1. 1.Li+ 2 mg/L
  2. 2.Na+ 10 mg/L
  3. 3.NH4+ 10 mg/L
  4. 4.K+ 20 mg/L
  5. 5.Ca2+ 20 mg/L
  6. 6.Mg2+ 10 mg/L

Tap water

  1. 2.Na+
  2. 4.K+
  3. 5.Ca2+
  4. 6.Mg2+
Shodex IC YK-421 (4.6 mm I.D. x 125 mm)
5 mM Tartaric acid + 1 mM Dipicolinic acid + 1.5 g/L Boric acid aq.
Flow rate
1.0 mL/min
Non-suppressed conductivity
Column temp.
40 ℃

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