Hitachi ZA3000 Series Instruction Manual page 51

3.1 Generation of Measurement Conditions
(2) Set the following items.
 Determination Mode
[Absorbance] is used to measure the absorbance of a
solution but does not quantify the solution.
[Working Curve] is used to perform quantitative analysis
of a sample in which coexisting materials contained in
an unknown sample do not affect the atomization of the
element.
[STD Add.] is used to perform quantitative analysis of a
sample in which coexisting materials contained in an
unknown sample affect the atomization of the element.
It can be used with only one sample.
[Simple STD Add.] is used to perform quantitative
analysis of a sample in which coexisting materials
contained in an unknown sample affect the atomization
of the element. Multiple samples containing similar
coexisting materials are quantified with one working
curve.
Specify [Working Curve] here.
For the details of [Absorbance], [STD Add.] and [Simple
STD Add.], refer to "5.1 Various Measurement
Methods."
 Order
Specify the order of working curve. [Linear] or
[Quadratic] is normally selected.
In flame analysis, the working curve generally tends to
bend at an absorbance from 0.2 to 0.5 or higher,
although this varies with the element. When the
working curve bends, the [Quadratic] order may be more
effective. And when the absorbance goes even higher
than the range given above, the [Cubic] order may be
more effective, but the working curve in this case is not
very suitable for quantitative analysis.
Since recalculation with the Order changed can be done
after the end of measurement, it may be better to leave
this setting at [Linear] when uncertain about the proper
order.
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