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Ion concentration inoLab

Multi 9620 IDS

64 ba77173e04 12/2017

7.3.4 Sample subtraction

With the Sample subtraction procedure, a known amount of sample is added to

the standard solution (complexing agent or precipitating agent).

The ion concentration in the sample is calculated from the change in potential.

The sample subtraction is one method for the indirect determination of ions. It

is used for the determination of ions for which no direct determination is possi-

ble.

Calibration

1. Select the measuring method (see section 7.3 S

ELECTING THE MEASUR-

ING METHOD, page 56).

An entry window appears.

2. Using <><> and <ENTER>, set the ion type for the ion in the stan-

dard (Ion type) as necessary.

On selection of the ion type that can be defined (ION):

Using <><> and <ENTER>, set the valence (Valency) and molar

weight (Molar mass) for the ion in the standard solution.

3. Select and confirm Continue with <><> and <ENTER>.

Ion type S

Continue

Sample subtraction

01.09.2017 08:00

4. Prepare two standard calibration solutions.

5. Perform a two-point calibration according to user guidance.

6. The calibration record is displayed as soon as a stable value is

achieved for the second standard calibration solution.

01.09.2017 08:00

#1 0.010 mg/l 374.4 mV 25.0 °C

#2 0.020 mg/l 358.1 mV 25.0 °C

Slp.: 54.1 mV

Sensor +++ (Ion type: S)

CALIBRATION

ADA 94/IDS DIN

B092500013

wtw inoLab Multi 9620 IDS User Manual

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