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Sample addition method (Single)
The sample is added only once to the standard solution of the target ion species.
Sample addition method (Double)
The sample is added twice to the standard solution of the target ion species. This
mode is used to obtain the electric potential slope of the electrode used.
7.1.3 General Cautions for Standard Addition Method
In order to obtain more accurate and reliable data, pay attention to the following points.
・Avoid coexistence of the ions with low coexisting tolerance limit.
Refer to instruction manual of Ion electrode for "Effect of coexisting substance".
・Avoid coexistence of interfering ions.
・In the known addition method (Double) and sample addition method (Double), the
electric potential slope of the ion electrode are obtained with approximation formulas
after the sample or standard solution is added. Therefore, it is not necessary to perform
calibration or check the electric potential slope before the measurement. However, the
following condition may affect the measurement results.
-If the linearity of the electrode used is poor
-If the electric potential slope is greatly different from the theoretical values
(Nernst coefficient)
-If the sample temperature shifted significantly
・After sample or standard solution is added, sufficiently stir the sample.
7.1.4 Standard Addition Method MEAS Screen
The temperature setting in ION standard addition mode is independent from ION
measurement. Therefore, the temperature setting set in ION measurement is not
applied.
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In the known addition method (Single), the
targeted ion concentration in a sample solution
is obtained from a change in electric potential by
adding once a small amount of the target ion
solution to the sample solution.
1.
Tap
and tap "Application".
2.
Tap
on the right of the ION std. addition
mode item.
3.
Tap
on the right of the TEMP setting item
and tap ATC or MTC.
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