Agilent InfinityLab LC Series Diode Array Detectors User Manual 66
4 Preparing the Module
Solvent Information
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
3
or CuCl
2
.
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 %.
Diamond-Like Carbon (DLC)
Diamond-Like Carbon is inert to almost all common acids, bases and solvents.
There are no documented incompatibilities for HPLC applications.
Fused silica and Quartz (SiO
2
)
Fused silica is used in Max Light Cartridges. Quartz is used for classical flow cell
windows. It is inert against all common solvents and acids except hydrofluoric
acid and acidic solvents containing fluorides. 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.
Zirconium Oxide (ZrO
2
)
Zirconium Oxide is inert to almost all common acids, bases and solvents. There
are no documented incompatibilities for HPLC applications.
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