Custom Premix Selecting "Custom Premix" option means that all of the beads you have chosen will be premixed in manufacturing before the kit is sent to you.
GC methods do not use a lot of water. If it does, it is usually for sample preparation. If the sample being analyzed is aqueous, water is also used to prepare blanks and standards.
UniSolv® solvents are recommended for all organic trace analysisfor gas chromatography tasks regardless of detection method (GC-ECD, GC-FID, GC-MS) or sample (e.g. water, soil).
Merck's high-purity SupraSolv® solvents for headspace GC are ideal for the analysis of residual solvents in APIs and drugs according to Ph Eur and USP.
Nitrogen, helium and hydrogen are commonly used carrier gases in gas chromatography (GC). Hydrogen offers several benefits over the other gases, such as a reduction of the time of analysis, improved sensitivity and resolution, and lower cost.