Books > Science & Mathematics > Chemistry > Analytical chemistry
|
Buy Now
Applications of Supercritical Fluids in Industrial Analysis (Hardcover, 1st ed)
Loot Price: R2,570
Discovery Miles 25 700
|
|
Applications of Supercritical Fluids in Industrial Analysis (Hardcover, 1st ed)
Expected to ship within 12 - 17 working days
|
Donate to Against Period Poverty
Total price: R2,590
Discovery Miles: 25 900
|
the continued search for rapid, efficient and cost-effective means
of analytical measurement has introduced supercritical fluids into
the field of analytical chemistry. Two areas are common:
supercritical fluid chromatography and supercritical fluid
extraction. Both seek to exploit the unique properties of a gas at
temperatures and pressures above the critical point. The most
common supercritical fluid is carbon dioxide employed because of
its low critical temperature (310C), inertness, purity,
non-toxicity and cheapness. Alternative supercritical fluids are
also used and often in conjunction with modifiers. The combined
gas-like mass transfer and liquid-like solvating characteristics
have been used for improved chromatographic separation and faster
sample preparation. Supercritical fluid chromatography (SFC) is
complementary to gas chromatography (GC) and high performance
liquid chromatography (HPLC) providing higher efficiency than HPLC,
together, with the ability to analyse thermally labile and high
molecular weight analytes. Both packed and open tubular columns can
be employed, providing the capability to analyse a wide range of
sample types. In addition, flame ionization detection can be used
thus providing "universal" detection. The separation of complex
mixtures by chromatography provides an effective means of
identifying individual components. However, as with most
techniques, it is the sample preparation which is both time and
labour intensive. Traditionally, Soxhlet extraction has been
employed but this has several disadvantages when extracting
compounds of low and medium polarity using liquid solvents.
Extractions are time consuming,. relatively unselective and use
large amounts of hazardous solvents, so that further cleanup is
usually necessary. Furthermore, after extraction and cleanup steps,
the solution must usually be concentrated by evaporation prior to
introduction into a chromatograph. Supercritical fluid extraction
offers an elegant alternative to the currently applied extraction
procedures. The ability of supercritical fluids to deposit
extractants by simple depressurisation and/or cryogenic focusing
means that solvent concentration can be done quickly and without
heat or vacuum. These latter point are particularly important when
one is seeking preservation of sensitive analytes. This text
therefore seems appropriate at this stage to review the current
situation regarding supercritical fluids in analytical chemistry
and, to consider the future possibilities to which they may be
applied.
General
Imprint: |
Kluwer Academic Publishers
|
Country of origin: |
Netherlands |
Release date: |
July 1993 |
First published: |
August 1993 |
Authors: |
John R. Dean
|
Dimensions: |
234 x 156mm (L x W) |
Format: |
Hardcover
|
Pages: |
240 |
Edition: |
1st ed |
ISBN-13: |
978-0-7514-0057-1 |
Categories: |
Books >
Science & Mathematics >
Chemistry >
Analytical chemistry >
General
|
LSN: |
0-7514-0057-2 |
Barcode: |
9780751400571 |
Is the information for this product incomplete, wrong or inappropriate?
Let us know about it.
Does this product have an incorrect or missing image?
Send us a new image.
Is this product missing categories?
Add more categories.
Review This Product
No reviews yet - be the first to create one!
|
You might also like..
|
Email address subscribed successfully.
A activation email has been sent to you.
Please click the link in that email to activate your subscription.