For electrolytic eluent generation, or when manually preparing eluent and regenerant, use ASTM Type I (18.2 megohm-cm) filtered and deionized water that meets the specifications listed in the following table.

ASTM filtered, Type I deionized water specifications for ion chromatography

Contaminant

Specification

Ions–Resistivity

>18.2 megohm-cm

Organics–TOC

<10 ppb

Iron/Transition Metals1)

<1 ppb

Pyrogens

<0.03 (EU/mL)

Particulates > 0.2 µm

<1 (units/mL)

Colloids–Silica

<10 ppb

Bacteria

<1 (CFU/mL)