HPLC Column Troubleshooting: How to Fix Peak Tailing, Peak Splitting, and High Backpressure

A distorted peak or a sudden pressure spike can ruin a whole sequence of injections. The good news is that most HPLC column problems follow predictable patterns, and you can usually fix them in minutes once you know where to look. This guide covers the three most common issues: peak tailing, peak splitting and high backpressure, with practical causes and solutions.

Before You Blame the Column: A Quick Diagnostic Check

Many problems blamed on the column actually come from the system. Start with these questions:

• Does the problem appear on other columns or methods too?
• Did anything change recently, such as mobile phase, sample, fittings, or guard column?
• Does swapping in a known-good column solve it?

If a new column behaves normally, the old one is the culprit. If not, look at the injector, tubing, fittings, and mobile phase.