INTRODUCTION
.
Ionic contamination has.lon.g been recognIzed as a
primary cause of corrOSIon m steam cycle p°.wer
plants. Accordingly, monitorin~ and contr°.11mg
such contaminants are of great Importance m
power plant operations. Dionex''s chemically s~p-
pressed Ion Chromatography (IC) technology IS
used worldwide to provide the required sub parts-
per-billion (Ppb) level measurement sensitivity for
inorganic anions in high purity water. As descrIbed
below, organic acid anions are now .m°.wn to ~e a
source of corrosion-causing contanllnatI~n. ThIS
Application Note describes a method WhICh uses
gradient IC in combination with automated sample
preconcentration to determine both org.a~ic ~d
inorganic anions fro~ a single ~am~le ~nJectIon.
These include the anIons of major sIgnIficance:
chloride, sulfate, acetate and formate; as well as
additional ions such as fluoride, nitrite, bromide,
nitrate and phosphate. Without gradient elution, an
eluant strong e~ough to el~te s~lfat~ would cause
the weakly retained org~Ic acId anlo~s and fl~o-
ride to coelute in the v,oId volume. Usmg.gradient
elution, all of these anIons can be determmed at
I b I I
ow pp eve s. 赛默飞戴安ICS-2100离子色谱系统
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