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7.1.8 Sample Addition Method (Double) Measurement
This mode is used to obtain the concentration of the ion species under measurement by
adding a small amount of sample to standard solution for the ion species to measure
twice, thus increasing the ion concentration of the target component, and then measuring
the change in electric potential at that time.
Measurement condition setting
1.
Tap
on the right of the Sample addition method item in the ION standard addition
mode screen.
2.
Tap
on the right of the Sample add. method (Double) item.
3.
Set the measurement condition in the Sample add. method (Double) screen.
Enter the 1 and 2 volume of the additive sample, concentration of the standard solution,
volume of the standard solution and ion valency of measurement ion.
4.
Tap
after complete setting.
The MEAS screen is displayed.
To return the set value to default, tap the
Setting item and range
Volume of the additive sample 1, 2:
Ion valency:
Concentration of the standard solution:
Standard solution volume:
HINT!
For more accurate measurement:
Normally, the amount of the standard solution to be added should be from 0.1% to 10% of
the sample solution. It is desirable that when the standard solution is added to the sample
solution, the concentration of the ion species under measurement increase by 1 time to 10
times in the sample solution. If the concentration of the added standard solution is too low
or if the volume of the added standard volume is larger than that of the sample, a large
error may occur in the measurement result.
5.
Immerse the ion electrode in sample solution and tap
The measurement starts. When the indication stabilizes, the HOLD indicator lights up
and the measurement value is determined.
6.
Tap
to proceed to the next measurement.
7.
Immerse the ion electrode in the 1 sample solution and tap
The measurement starts.
.
0.01 mL to 1000.00 mL
+2, +1, 1, 2
0.1 mg/L to 19000.0 mg/L
1.0 mL to 19999.9 mL
.
.
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