Agilent Technologies 1290 Infinity User Manual page 55

4
Using the Module
Solvent Information
Titanium
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. Reducing 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). The addition of nitric acid to hydrochloric or sulfuric acids
significantly reduces corrosion rates. Titanium is subject to corrosion in
anhydrous methanol, which can be avoided by adding a small amount of water
(about 3 %). Slight corrosion is possible with ammonia > 10 %.
Fused silica
Fused silica is inert against all common solvents and acids except hydrofluoric
acid. It is corroded by strong bases and should not be used above pH 12 at
room temperature. The corrosion of flow cell windows can negatively affect
measurement results. For a pH greater than 12, the use of flow cells with
sapphire windows is recommended.
Gold
Gold is inert to all common HPLC solvents, acids and bases within the
specified pH range. It can be corroded by complexing cyanides and
concentrated acids like aqua regia (a mixture of concentrated hydrochloric
and nitric acid).
Zirconium Oxide
Zirconium Oxide (ZrO ) is inert to almost all common acids, bases and
2
solvents. There are no documented incompatibilities for HPLC applications.
Platinum/Iridium
Platinum/Iridium is inert to almost all common acids, bases and solvents.
There are no documented incompatibilities for HPLC applications.
Agilent 1290 Infinity Valve Drive and Valve Heads 55