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The Knowledge Hub
Practical troubleshooting guides for working analytical chemists — HPLC, UHPLC, LC-MS, GC, and reagent prep. Each guide is diagnostic-first and linked to the tool that resolves it.
Method Basics
Ion Exchange Chromatography (IEX): Anion vs Cation, Resin Selection, and Method Setup
How ion exchange chromatography works, when to choose anion vs cation exchange, strong vs weak resins, and how to fix poor binding…
Method Basics
Signal-to-Noise Ratio for LOD: How to Measure and Use It in Chromatography
connectivity probe
Method Basics
LOD Calculation: How to Determine the Limit of Detection Using ICH Q2 Methods
The limit of detection is calculated as LOD = 3.3σ/S, where σ is the standard deviation of the response and S is…
Method Basics
Limit of Detection (LOD): What It Means and How It Differs from LOQ
The limit of detection is the lowest analyte concentration that a procedure can reliably distinguish from a blank, but not necessarily measure…
Method Basics
Chromatography Resins: Types, Properties and How to Select the Right Resin
A chromatography resin is the particulate stationary phase packed into a chromatographic bed: a base matrix, a defined particle size, an internal…
GC GC-MS Troubleshooting