If a sample contains transition metals in ppm (mg/L) levels, these elements may interfere with cation detection by suppressed conductivity. The addition of a complexing agent such as pyridine-2,6-dicarboxylic acid (PDCA, Item # 039671) to the CS12A eluent is required to selectively remove transition metals from the eluent via the suppression system.

Detection Limits of Dionex DRS 600 Sample Pretreatment and Subsequent Ion Chromatography

Anion

ppb1)

Cation

ppb2)

Chloride

4

Lithium

0.03

Bromide

20

Sodium

1.0

Chlorate

30

Potassium

2.0

Nitrate

20

Magnesium

0.6

Phosphate

50

Calcium

0.8

Sulfate

30

Oxalate

50