●Zeeman 방식으로 정확한 바탕값 보정,graphite furnace 타입. ●모든 분석 원소를 low ppt 수준으로 측정.
●고감도의 EDS lamp 사용. ●55개시료 자동채취
MGA-915
Atomic Absorption Spectrometer
Description
High selectivity
of analysis based on the ZAAS-HFM technique
Totally automated
operation and adjustment for a specific element
Compact benchtop
design incorporating all spectrometer, atomizer, graphite furnace, light
sources, detector, and power supply components into a single unit
Fast 62.5-mm focal
length monochromator with a 1800-l/mm grating covering the 190 - 800
mm spectral
range
Built-in
autosampler for 55 samples
Electrothermal
atomization in a Massman graphite furnace
Computer-controlled automated six-lamp turret.
Design
features
The MGA-915 AA spectrometer
employs a scheme for high-frequency modulation of light polarization with
transverse magnetic field allowing a higher modulation frequency, up to 50 kHz.
This is the most efficient up-to-date means for the correction for nonselective
background absorption. Thus, even such complex organic samples as milk, juices,
and blood can be assayed without preliminary mineralization, the requirements
for the full mineralization of more complex samples, such as food products,
soil, etc., being made much more lenient as well, because the sample weight can
be drastically decreased due to the high sensitivity of the instrument. In
addition, this technique provides for a threefold decrease in power consumption
and for shortening the warm-up time to 10 minutes.
Detection
limits for some of the elements
Ag
Al
Mg
Cd
Ni
Cr
Cu
Co
Mn
Pb
Sn
Fe
Zn
Au
solutions, μg/l*
0.05
0.2
0.06
0.008
0.3
0.05
0.03
0.3
0.03
0.12
0.25
0.18
0.008
0.5
in air,
ng/m3**
0.2
0.6
0.2
0.06
1.0
0.15
0.7
1.0
0.2
0.1
0.8
0.6
0.15
1.5
*For samples of 40
μl volume; the sample volume being increased to 200 μl, the detection limit
improves 5-fold **Air pumping time being 5 min
Sample
handling Multiple sample input with intermediate drying is provided to
lower detection limit when assaying natural, drinking, and industrial water. The
instrument can be furnished with an air sampler, whereby metal airborne aerosols
are electrostatically precipitated from the air directly onto separable graphite
atomizers. The MGA-915 spectrometer affords concurrent continuous on-site
assaying of 6 to 8 selected elements in the air.
Automated
measuring procedure Switching from one element to another is controlled
by a computer. The necessary light source is set using a turret with 6
hollow-cathode lamps. The monochromator is automatically tuned to a wavelength
corresponding to the specific element, and the atomization parameters drying and
atomization (temperature and duration, and consumption of argon) are set
according to the stored library data. An analysis is carried out automatically,
including drying, pyrolysis, and atomization of a sample and purification of the
cell. The analysis procedure and its results are displayed on the screen of a
computer monitor. The dedicated software is MS Windows?compatible system,
enabling easy-to-grasp monitoring of the operation procedures and assay
results.
Simple
maintenance and service The cooling water circulates in a closed loop, no
tapping to external water supply being needed. The service life of a Massman
graphite atomizer with pyrocoating commonly amounts to about 150 assays, and to
300 assays when operating with readily volatile elements (Cd, Pb,
Zn).
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