Metrohm 797 VA Computrace Manuel d'utilisateur télécharger pdf (Page 259)

8.7 Standard addition technique

797 VA Computrace – Software

247

8. Select the Determination tab (see section 5.2) and enter Sample

identifier

, Sample amount, Cell volume, and the number of

spiked solutions in the No. of cells field.

9. Select the Substances tab (see section 5.2) and make sure that

for each substance entered in the table the concentrations of

the spiked sample solutions are defined in the CELL CONCEN-

TRATIONS

window which is opened by clicking on the

button.

10. Close the EDIT WORKING METHOD PARAMETERS window by

clicking <OK>.

11. Place the sample solution in the measuring vessel at the 797

VA Computrace stand.

12. Click on or MAIN WINDOW / Window / Monitor to open

the MONITOR window.

13. Start the measurement by clicking the icon in the MAIN

WINDOW

or the button in the MONITORING win-

dow.

14. Enter the Sample ID (used as part of the determination file na-

me) in the PLACE SAMPLE window and click <OK>.

15. Each time a solution exchange is required in the BATCH SOLU-

TION EXCHANGE

window, replace the measuring solution by

the next spiked sample solution.

Use automatic standard addition

In the automatic standard addition, a known amount of the analyte

is added once or several times to the sample using 700/800 Dosi-

nos, or 685/805 Dosimats. Proceed as follows:

1. Install Dosing Devices to the 797 VA Computrace stand (see

How to Install Dosing Devices for automatic addition, section

8.1).

2. Click on or MAIN WINDOW / Mode / Determination.

3. Click on or MAIN WINDOW / Window / Working method

specification

to open the WORKING METHOD SPECIFICATIONS

window.

4. Load the desired method into the WORKING METHOD SPECIFI-

CATIONS

window (see How to Load a method, section 8.4).

5. Select

Standard addition in the Calibration field of the WORK-

ING METHOD SPECIFICATIONS

window.

6. Select Automatic for Addition in the WORKING METHOD SPECI-

FICATIONS

window.

7. Click to open the DOSINOS window.

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Metrohm 797 VA Computrace Manuel d'utilisateur Page 259

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