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This instrument measures the concentration of elements, typically metals
and metalloids, in liquid samples, using a graphite furnace. A small amount
of sample (5 - 50 ul) is introduced to the furnace and the temperature is
ramped over time until the specific element is atomized. Absorption
measurements of a particular wavelength are taken at appropriate times and
compared with a generated standard curve to provide quantitative data. The
detection limits for furnace AA are usually lower than those of flame AA.
Although element sensitive, sub-ppb detection limits are normative.
Reproducibility values of 10% RSD and accuracy 10% of actual value are
considered acceptable. In addition to making multiple sample analysis
easier, the attached auto sampler assists in increasing precision, adding
any modifiers necessary, and may be used to generate/regenerate and check
standard curves. The instrument is equipped with Zeeman background
correction capabilities. A PHOTRON super lamp power supply is available to
heighten sensitivity. Currently we have lamps available to analyze Barium,
Boron, Cadmium, Calcium, Chromium, Cobalt, Copper, Iron, Lead, Lithium,
Magnesium, Manganese, Mercury, Molybdenum, Nickel, Potassium, Silicon,
Silver, Sodium, Titanium, Terbium, Vanadium, Ytterbium, and Zinc. In
addition we have Arsenic and Selenium super lamps for use with the PHOTRON
boosted discharge device. Customers are welcome to supply their own lamps
for any additional elements they may wish to analyze.
Samples are typically non-viscous, particle-free, aqueous liquids, although
complex matrices and organic solvents may be analyzed. The solution matrix
of the standards and samples should be as similar as possible. The amount
of sample preparation and the type of standard curve necessary as well as
any modifiers required are all dependent upon the element of interest and
the nature of the sample. Each auto sampler vials holds approximately 2 ml
but sample volumes as low as 0.5 ml can be used. Vials are provided as part
of the analysis cost.
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