Metrohm 797 VA Computrace Manuel d'utilisateur télécharger pdf (Page 225)

8.5 Determinations with voltammetric trace analysis

797 VA Computrace – Software

213

8. Follow the instructions in the appearing message windows.

Perform a test determination with the Pb test method

With the aid of this example method for the determination of lead

in the ion standard solution supplied using the DME, you can easily

check whether the 797 VA Computrace System is functioning

properly.

1. Click on

or MAIN WINDOW / Mode / Determination.

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

specification

to open the WORKING METHOD SPECIFICATIONS

window.

3. Click on or MAIN WINDOW / File / Load method.

4. Select the method file Test Pb in standard solution.mth in the

OPEN window and click <OK>. The method is loaded into the

WORKING METHOD SPECIFICATIONS window.

5. Add 20 mL ultrapure water to the empty measuring vessel at

the 797 VA Computrace stand.

6. Add 0.5 mL potassium chloride c(KCl) = 3 mol/L (Metrohm No.

6.2308.020) to the measuring vessel.

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

the MONITOR window.

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

WINDOW

or the button in the MONITORING win-

dow. The PLACE SAMPLE window appears.

9. Use a pipette to add 100 μL Pb ion standard solution β(Pb) = 1

g/L (Metrohm No. 6.2301.100) into the measuring vessel and

click the

<OK> button.

10. The sample solution is measured three times. Then the MAN-

UAL ADDITION

window appears.

11. Use a pipette to add 100 μL Pb ion standard solution β(Pb) = 1

g/L (Metrohm No. 6.2301.100) into the measuring vessel and

click the

<OK> button.

12. The sample solution spiked with standard addition solution is

measured three times. Then the MANUAL ADDITION window

appears.

13. Use a pipette to add 100 μL Pb ion standard solution β(Pb) = 1

g/L (Metrohm No. 6.2301.100) into the measuring vessel and

click the <OK> button.

14. The sample solution spiked again with standard addition solu-

tion is measured three times. Then the END OF DETERMINA-

TION

window appears.

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Metrohm 797 VA Computrace Manuel d'utilisateur Page 225

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