1260 Infinity QuatPump VL User Manual 51
Using the Pump
4
Solvent Information
Solvent Information
Observe the following recommendations on the use of solvents.
• Follow recommendations for avoiding the growth of algae, see “Algae
Growth in HPLC Systems” on page 50
• Small particles can permanently block capillaries and valves. Therefore,
always filter solvents through 0.4 µm filters.
• Avoid or minimize the use of solvents that may corrode parts in the flow
path. Consider specifications for the pH range given for different materials
like flow cells, valve materials etc. and recommendations in subsequent
sections.
Solvent compatibility for stainless steel in standard LC systems
Stainless steel is inert against many common solvents. It is stable in the
presence of acids and bases in the pH range specified for standard HPLC (pH 1
– 12.5 ). It can be corroded by acids below pH 2.3 . In general following
solvents may cause corrosion and should be avoided with stainless steel:
• Solutions of alkali halides, their respective acids (for example, lithium
iodide, potassium chloride, and so on) and aequous solutions of halogenes
• High concentrations of inorganic acids like nitric acid, sulfuric acid and
organic solvents 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:
2 CHCl
3
+ O
2
→ 2 COCl
2
+ 2 HCl
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.
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