Page 8 - Shimadzu AA-7800 Series

Any Application

Selectable Manual or Automatic Dual Atomizer System Dual-Background Correction Functions

Manual Dual Atomizer System Equipped Standard with Two Kinds of Background Correction -
D2 (Deuterium Lamp) and SR (High-Speed Self-Reversing) Methods
Model with Manual Atomizer Switching
Offers Superior General Applicability
Adding a GFA-7800 graphite furnace atomizer to By selecting the best background correction method for the given sample, highly accurate and
the AA-7800F system enables manual switching reliable analytical results can be obtained for a wide variety of samples.
between flame and furnace units. Switching
between units is extremely easy and does not
require any tools. Samples suitable for the D2 method Samples suitable for the SR method
Flame analysis Furnace Analysis
The manual-switching model also enables
changing the burner angle and using an atomic Purified water, tap water, environmental water, etc. Samples with a complex matrix
muffle, which can measure various samples. Samples with a relatively simple matrix (Containing a large quantity of a specific element as the
main component)

D2 Method — Highly sensitive background correction

Variable Burner Angle Features
(for analyzing high concentration samples) 1. Detection sensitivity is superior to the SR method. Therefore, this method is suitable for the analysis of samples with a simple matrix
requiring high sensitivity, such as the measurement of trace levels of impurities in ultrapure water or environmental analyses.
2. As the lighting frequency is higher than with the SR method, it can eliminate noise due to emission components of the flame or graphite
tube to permit accurate atomic absorption measurements.
3. The original hollow cathode lamp can be used.

SR Method — Accurate background correction over a wide range
Atomic Muffle Furnace
(for hydride generation method with an electric furnace) Features
1. SR correction is generally more accurate than D2 correction. As both atomic absorption and background absorption can be measured using
a single lamp, the correction errors due to light-axis misalignment are extremely small.
This is ideal for the quantitation of trace components in a matrix exhibiting complex background absorption, such as bio-samples and metals.
2. Permits background correction over the entire wavelength range from 185 nm to 900 nm.
3. This method can correct for spectral interference due to neighboring lines that can occur when a resonance line for another element
Automatic Dual Atomizer System exists near the analytical line for the target element.
4. As no polarizer is used, measurements are possible with low light losses and a high S/N ratio.
Model with Automatic Atomizer Switching Offers Excellent Operability and Speed 5. The rapid lamp lighting permits accurate measurement unaffected by emission noise in the atomizer.
By adding a GFA-7800 graphite furnace atomizer to the AA-7800F/AAC system, automatic and quick switching between * Hollow cathode lamp L-2433 is required to use the SR method. Hollow cathode lamp L-2433 can also be used for the D2 method.
flame and furnace modes becomes possible with software operation. There is no need to disconnect tubing or wiring either.
It is recommended for users to switch between flame and furnace frequently for routine analysis.

˙ Examples suitable for D2 method ˙ Examples suitable for SR method
(where differences result between SR and D2 methods) (where differences result between SR and D2 methods)
Example: Measurement of trace levels of lead in 2% NaCl solution by molecular Example: Measurement of trace levels of zinc in iron (analysis of Zn in Fe solution)
absorption (analysis of Pb in 2% NaCl solution)
BGC-SR method BGC-D2 method BGC-SR method BGC-D2 method
ᶃZn 0.25ppm
Atomic absorption signal
Atomic absorption signal Background signal ᶄZn 0.50ppm
Background signal
ᶅFe 0.1%
ᶆFe 0.5%
ᶇFe 0.5% + Zn 0.25ppm
Background signal
ᶈFe 0.5% + Zn 0.5ppm
ᶉFe 0.75% + Zn 0.3ppm
Atomic absorption signal
During Flame Measurements During Furnace Measurements The identical 0.5 ppm Zn solution is accurately Due to inadequate correction, the absorbance is higher at
corrected to the same absorbance at (2) and (6). (6) than at (2) for the identical 0.5 ppm Zn solution.
Amount 0ppb 2ppb 4ppb Amount 0ppb 2ppb 4ppb
It can be seen that the sensitivity is higher with the BGC-D2 method.
8 9