|
This instrument is typically used to measure the concentration of metals
and metalloids in liquid samples. Samples are introduced into a hot-flame
which atomizes the element of interest. A lamp of desired wavelength and a
PMT detector provide absorbance values based on the amount of the element
present. When compared to a generated standard curve, the element of
interest can be quantified. Detection limits for the instrument vary
according the element under consideration, but accurate quantification down
to ppm and lower is normal. Reproducibility values of 2.0% RSD and accuracy
4% of actual value are considered acceptable. Currently we have lamps
available to analyze for: Arsenic, Barium, Boron, Cadmium, Calcium,
Chromium, Cobalt, Copper, Iron, Lead, Lithium, Magnesium, Manganese,
Mercury, Molybdenum, Nickel, Potassium, Selenium, Silicon, Silver, Sodium,
Titanium, Terbium, Vanadium, Ytterbium, and Zinc. Users are welcome to
supply their own lamps for any element they wish to detect that is not in
the above list.
The instrument is capable of flame AA (Atomic absorption), FE (flame
emission) and LE (lamp emission) spectrometry. Users can choose between
air/acetylene and nitrous oxide/acetylene flames. Also available are a
VGA-76 cold vapor generator, a SPS-5 Autosampler, and a SIPS Autodiluter.
Samples must be non-viscous, particle-free, aqueous liquids. The matrix
should be as simple as possible to minimize interference. Various modifiers
are available and may be necessary to further reduce interference and
obtain acceptable results. Standards and samples should be as similar as
possible. Approximately 5 ml (manual) or 15 mL (autosampler) of sample is
necessary for each measurement.
Click HERE to visit the Varian website.
|
