Cation Analysis in the Presence of PEG (YS-50)

Waste water from electronic production factories may contain hydrophilic polymers. As a waste water model, sample containing mono- and di-valent cations in the presence of polyethylene glycol (PEG2000) was prepared. Ion chromatography (cation) column, ICYS-50 was used under non-suppressor method. All cations analyzed showed good recovery without having any effect from polyethylene glycol. Some PEG2000 is adsorbed on the column, however this can be removed by adding 50 % acetonitrile in the eluent.

Sample: 10 µL
Cation mixture in 5 % PEG2000 solution

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No. Cations Recovery (%) No. Cations Recovery (%)
1 Li+ 2 mg/L 106 4 K+ 20 mg/L 101
2 Na+ 10 mg/L 104 5 Mg2+ 10 mg/L   99
3 NH4+ 10 mg/L 101 6 Ca2+ 10 mg/L   97
Column
Shodex IC YS-50 (4.6 mm I.D. x 125 mm)
Eluent
4 mM Methanesulfonic acid aq.
Flow rate
1.0 mL/min
Detector
Non-suppressed conductivity
Column temp.
40 ℃

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