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•
Flow rate through columns too high
Check the pump flow rate.
•
Clogged column bed supports
Refer to the column manual for troubleshooting procedures.
•
Contaminated columns
Clean the columns as instructed in the column manual.
•
Plugged Injection valve passages
Rebuild the injection valve (see
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 result from a
contaminated, malfunctioning, or incorrectly installed injection valve. If these
peaks co-elute with peaks of interest, they will cause nonreproducible peak
heights and/or 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 the standards.
•
Incorrect or contaminated eluent
Remake the eluent (see
•
Malfunctioning injection valve
Contact Technical Support for Dionex products for assistance.
Doc. 155028-01 08/20
Section
5.11).
Section
3.4).
4 • Troubleshooting
55
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