User manual

64 1260 Nanoflow Pump User Manual
4 Using the Pump
Solvent Information
Solvent Information
Always filter solvents through 0.4 µm filters, small particles can permanently
block the capillaries and valves. Avoid the use of the following steel-corrosive
solvents:
• Solutions of alkali halides and their respective acids (for example, lithium
iodide, potassium chloride, and so on).
• High concentrations of inorganic acids like sulfuric and nitric acid,
especially at higher temperatures (replace, if your chromatography method
allows, by phosphoric acid or phosphate buffer which are less corrosive
against stainless steel).
• Halogenated solvents or mixtures which form radicals and/or acids, for
example:
2CHCl
3
+ O
2
–> 2COCl
2
+ 2HCl
This reaction, in which stainless steel probably acts as a catalyst, occurs
quickly with dried chloroform if the drying process removes the stabilizing
alcohol.
• Chromatographic grade ethers, which can contain peroxides (for example,
THF, dioxane, di-isopropylether). Such ethers should be filtered through
dry aluminium oxide which adsorbs the peroxides.
• Mixtures of carbon tetrachloride with 2-propanol or THF dissolve stainless
steel.