Westmoreland Mechanical Testing &
Research, Inc.
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Phone: 724-537-3131 Fax:
724-537-3151 or Email:
admin@wmtr.com
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Westmoreland Mechanical Testing &
Research, Inc. |
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Chemical Testing
WMT&R uses the latest spectrometer
technology, the ICP, combined with Graphite Furnace AA, to eliminate the
need for lengthy, classical wet chemical tests. These state of the art units provide increased analysis speed, element
Graphite furnace atomic absorption is
a routine technique for the determination of very low levels of trace metals in
a variety of sample types, such as metals, plants, oils, and water. |
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ranges, and sensitivity. 
The basic test method initiates when
a specific specimen, contained in a small, single-use graphite or ceramic
crucible, is fused under a flowing carrier gas atmosphere. The particular type
of gas present in the sample is released in its molecular form in the flowing
gas stream, then is separated from other liberated gases,
such as carbon monoxide, and finely measured in a thermal conductivity cell. The
Lecos, in general, can read as low as one part-per-million or as high as five
percent.
The basic technique, using ASTM E1184 specifications, involves a certain
amount of sample heated in a graphite tube furnace to provide a cloud of neutral
atoms. Light, emitted by a specific wavelength, is passed through the cloud, and
neutral atoms of this same element in the cloud absorb some of this light.
Thus, the intensity of the beam is decreased at the wavelength characteristic of
the element and is proportional to the concentration of the element in the test
solution.