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4 • Troubleshooting
Doc. 065291-01 3/09 93
• Plugged injection valve or auxiliary valve passages
Rebuild the valve (see Section 5.4
).
4.9 Peak “Ghosting”
“Ghosting” is the appearance of extraneous peaks in a chromatogram. These may
be late-eluting peaks from a previous injection. They may also 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. Refer to the instructions in the column manual. The
manual is included on the Dionex Reference Library CD-ROM (P/N 053891).
Verify that the correct eluent concentration is selected.
Install or replace the end-line filter on the end of the deionized water line (see
Section 3.4.1
).
• Malfunctioning injection valve or auxiliary valve
1. Rebuild the valve (see Section 5.4
).
2. If the valve leak persists, contact Dionex for assistance.