Agilent InfinityLab LC Series Diode Array Detectors User Manual 65
4 Preparing the Module
Solvent Information
Stainless Steel (SST)
Stainless steel is inert against many common solvents. It is stable in the
presence of acids and bases in a pH range of 1 to 12.5. It can be corroded by
acids below pH 2.3. It can also corrode in following solvents:
• Solutions of alkali halides, their respective acids (for example, lithium iodide,
potassium chloride, and so on) and aqueous solutions of halogens.
• 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, diisopropylether). Such ethers should be filtered through dry
aluminium oxide which adsorbs the peroxides.
• Solutions of organic acids (acetic acid, formic acid, and so on) in organic
solvents. For example, a 1 % solution of acetic acid in methanol will attack
steel.
• Solutions containing strong complexing agents (for example, EDTA, ethylene
diamine tetra-acetic acid).
• Mixtures of carbon tetrachloride with isopropanol or THF.
To Next Page
Loading...
Need help?
General
