Dionex ICS-90 - Nonreproducible Peak Height or Retention Time; Abnormal Retention Time or Selectivity

ICS-90 Ion Chromatography System
4-8 Doc. 031851-05 12/04
• Malfunctioning injection valve
Contact Dionex for assistance.
4.9 Nonreproducible Peak Height or Retention Time
• Column overloading
Dilute the sample (see Section 3.4.3
).
• Liquid leaks
Locate and eliminate the leaks (see Section 4.2
).
• Incomplete or imprecise filling of the sample loop
1. Fill the sample loop until excess sample exits the waste line.
2. Inspect the 1 cc syringe (P/N 016388) and replace if damaged.
• Pump not primed properly
Prime the pump (see Section B.13
).
4.10 Abnormal Retention Time or Selectivity
• Contaminated or incorrect eluent
Remake the eluent, using concentrated eluent and ASTM filtered, Type I (18-
megohm) deionized water.
• Contaminated or degraded sample
Take appropriate precautions when preparing and storing samples to prevent
contamination and degradation (see Section 3.4
).
• Contaminated column
1. Clean the column as instructed in the column manual. The column
manual is included on the Dionex Reference Library CD-ROM
(P/N 055405), located in the ICS-90 Ship Kit.
2. If cleaning is unsuccessful, replace the column.