Dionex ICS-1000 - Peak Ghosting

ICS-1000 Ion Chromatography System
4-16 Doc. 031879-01 3/03
• Clogged column bed supports
Refer to the instructions in the column manual for troubleshooting guidance.
Column manuals are included on the Dionex Reference Library CD-ROM
(P/N 053891), located in the ICS-1000 Ship Kit (P/N 057905).
• Contaminated columns
Clean the columns as instructed in the column manual.
• Plugged injection valve passages
Rebuild the injection valve (see Section 5.4
).
4.8 Peak “Ghosting”
“Ghosting” is the appearance of extraneous peaks in a chromatogram. These may
be late-eluting peaks from a previous injection, or they may be the result of a
contaminated standard or eluent, or a malfunctioning injection valve. These peaks
may co-elute with peaks of interest, resulting in nonreproducible peak
heights/areas.
• Insufficient time between sample injections
Wait until the previous sample has been completely eluted before making
another injection.
• Insufficient flush between samples
Flush the sample loop with at least 10 loop volumes of deionized water or
sample between sample injections.
• Incorrect or contaminated standards
Remake standards.
• Incorrect or contaminated eluent
Remake the eluent according to the instructions in the column manual.
Column manuals are included on the Dionex Reference Library CD-ROM
(P/N 053891).
Install or replace the end-line filter on the end of the deionized water line (see
Section 3.4.3
).