Preparing Standards for GC

A standard is a solution of exact and known concentration that we measure to calibrate the response of our instrument/method. Preparing standards for GC creates challenges which risk introducing accuracy errors into our standards due to issues with volatility, concentration, and the complexity of mixtures that are being analyzed. This module details the optimum technique for successfully preparing GC standards.

Topics include:

• Practical considerations
• Preparing known and exact concentrations
• Measure by volume or measure by weight?
• Density and relative density
• Preparing low concentrations
• Choosing a suitable solvent
• Practical technique
• Preparing volume-in-volume standards
• Preparing weight-in-volume standards
• Preparing weight-in-weight standards
• Stock solution
• Worked example