Page 5 - Shimadzu AA-6880

Enhanced Flame Analysis

Advantages of the Double-Beam System

Long-term stability High sensitivity
A
The graph shows the results of The graph shows the direct b s
measurements on 2 ppm copper (Cu) measurement results for 0.1
conducted over at least one hour. Absorbance ppm lead (Pb).
(The plot shows mean values for 11
repeated measurements.) Over the
course of more than 600
measurements, the instrument Measurement time Conc(ppm)
achieved a relative standard Data Showing Long-Term Stability for 0.1 ppm to 0.4 ppm Calibration Curve for Lead (Pb)
Flame Cu Measurements
Monochromator deviation within 1%.
Detector

Support for Developing Analytical Conditions

Automatic gas flow rate optimization
Automatic searching for optimal fuel gas flow rate (Japanese Patent 2099886). It is important
to determine the optimal gas flow rate for the flame when using an organic solvent or after
changing the burner height. The AA-6880F Series automatically optimizes the gas flow rate
by measuring the changes in absorbance between a blank and a standard sample. The
Chopper mirror Reference beam difference between the two is displayed on the screen. The gas flow rate achieving the
highest sensitivity is detected and this value is automatically set as the gas flow rate value.
D2 lamp

Sample beam
Optional Autosampler Reduces Analysis Workload
Beam splitter Low carryover
Great care must be taken to avoid carryover during flame analysis. The new ASC-6880
autosampler rinses the nozzle at the rinsing port on the overflow mechanism after each Discharge
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sample measurement is complete. This ensures 10 max. carryover during measurements
Burner head (or graphite tube) of multiple samples. The graph shows the results of consecutive analyses of 10 ppm, 20
ppm, and 50 ppm sodium (Na) standard solutions in the EMISSION mode. No carryover
could be detected when measuring the 10 ppm standard sample immediately after
measuring the 50 ppm Na standard sample. Conventional method Overflow method Data showing low carryover

Trace Sample Analysis Using Micro Sampling

Micro sampling
Hollow cathode lamp At least 1 mL (1000 µL) volume of a liquid sample is required for the continuous intake of
sample during normal flame analysis. With micro sampling, however, approximately 50 to 90 Sampling port Sampling port
µL of sample is injected in one shot into the flame and quantitation is based on the height
and area of the peak signal obtained. This method offers the advantages listed below.
Advantages Solenoid Solenoid
valve
valve
(closed) (opened)
Permits analysis of small sample volumes
Multi-element analysis of small sample volumes 1. Sample injected into 2. Solenoid valve opens to inject sample
micro sampling port. in one shot into the flame.
No blockage of burner slot with samples having a high salt concentration
Synchronized with the autosampler for auto-dilution measurements
* Synchronization with the autosampler requires the optional micro sampling kit.
Example of micro sampling analysis
Examples of the measured waveforms (overlaid) and calibration curve for micro
Double-Beam Optics and Stable Hardware Achieve Superior Stability sampling analysis are shown to the right.
A 2-ppm Cu standard solution was prepared by auto-dilution using the autosampler.
The AA-6880 Series incorporates newly developed 3D double-beam optics. The autosampler can also be used to conduct dilution measurements of the sample.
The optical system has been designed to produce maximum performance for each measurement method through (Injection volume: 90 µL)
optimal adjustment of the light beam and light beam digital filter, and by using optical components that restrict light
losses.

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