Agilent Technologies 1260Infinity II Bio-inert FractionCollector User Manual page 66

4
Preparing the Fraction Collector
Solvent Information
• Halogenated solvents or mixtures which form radicals and/or acids, for
• Chromatographic grade ethers, which can contain peroxides (for example,
• Solutions of organic acids (acetic acid, formic acid, and so on) in organic
• Solutions containing strong complexing agents (for example, EDTA,
• Mixtures of carbon tetrachloride with 2-propanol or THF.
Titanium (Ti)
Titanium is highly resistant to oxidizing acids (for example, nitric, perchloric
and hypochlorous acid) over a wide range of concentrations and temperatures.
This is due to a thin oxide layer on the surface, which is stabilized by oxidizing
compounds. Non-oxidizing acids (for example, hydrochloric, sulfuric and
phosphoric acid) can cause slight corrosion, which increases with acid
concentration and temperature. For example, the corrosion rate with 3 % HCl
(about pH 0.1) at room temperature is about 13 μm/year. At room
temperature, titanium is resistant to concentrations of about 5 % sulfuric acid
(about pH 0.3). Addition of nitric acid to hydrochloric or sulfuric acids
significantly reduces corrosion rates. Titanium is sensitive to acidic metal
chlorides like FeCl
methanol, which can be avoided by adding a small amount of water (about
3 %). Slight corrosion is possible with ammonia > 10 %.
66
chromatography method allows, by phosphoric acid or phosphate buffer
which are less corrosive against stainless steel).
example:
→ 2 COCl
2 CHCl + O
3 2
This reaction, in which stainless steel probably acts as a catalyst, occurs
quickly with dried chloroform if the drying process removes the stabilizing
alcohol.
THF, dioxane, di-isopropylether). Such ethers should be filtered through
dry aluminium oxide which adsorbs the peroxides.
solvents. For example, a 1 % solution of acetic acid in methanol will attack
steel.
ethylene diamine tetra-acetic acid).
or CuCl
3
1260 Infinity II Analytical-Scale & Bio-inert Fraction Collector User Manual
+ 2 HCl
2
. Titanium is subject to corrosion in anhydrous
2