Instruction manual

Chapter 7 Application Mode
F-72 79
3. Set the measurement condition in the Sample add. method (Single) screen.
Enter sample volume, concentration of the additive standard solution, volume of the
additive standard solution and electrode slope.
4. Tap key 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 solution: 0.01 mL to 1000.00 mL
Electrode slope: −99.99 mV/dec to +99.99 mV/dec
Concentration of the standard solution: 0.1 mg/L to 19000.0 mg/L
Standard solution volume: 1.0 mL to 19999.9 mL
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 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 standard solution and tap .
The measurement starts.
When the measurement is completed, concentration of the sample and the measuring
condition are displayed as measurement results.
Tap to return to the ION standard addition mode screen.
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.