Page 83 - Illustrated Pocket Dictionary of Chromatography

FILTER, SOLVENT 79

be used to pinpoint the problem component. In-line filters are specifi-
cally designed to remove particulates generated by the piston seal (as
it ages), etc. In-line filters are constructed from stainless steel or tita-
nium and placed in a special high-pressure holder.

filter photometers Unlike a fixed wavelength detector, a filter
photometer uses a deuterium lamp and controls the operating wave-
length through the use of band-pass filters.
filter, solvent Used to remove particulates from the solvent before
its being placed in a solvent reservoir. Although serving a function
similar to that of the inlet filter, the solvent filter removes a large frac-
tion of particulates so that maintenance of the inlet filters is greatly
reduced. Solvent filters should be used is two circumstances: (1) salts
or materials that contain particulate matter are added to the solvent,
or (2) the solvent purity (with respect to particulates) is in question.
With many high-purity solvents today, filtering the sample in the lab-
oratory often adds more particulates than it removes. If there is any
question, then contact the manufacturer.

A fully assembled solvent filter unit. The solvent is placed in the top reservoir
and pulled, by vacuum, through a filter. The filtered solvent is collected in the
side-armed flask.