1. Incorrect Sample
2. Incorrect Standard Preparation
3. Incorrect Sample Weighing
4. Wrong Diluent Used
5. Wrong Diluent Volume
6. Mobile Phase Preparation Error
7. Improper Mixing of Mobile Phase
8. Incorrect pH Adjustment
9. Incorrect HPLC/GCi Set up and Run
10. Wrong Injection Volume
11. Wrong Detector Wavelength
12. Incorrect injection Sequence
13. Uncalibrated Instrument Used
14. HPLC/GC Auto Injector Malfunction
15. Lamp intensity Failure
16. Column Leak, Poor Plate Count, Poor Resolution
17. Power Failure
18. Plumbing Problem/Leak
i High Performance Liquid Chromatography and Gas Chromatography
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