Metrohm 797 VA Computrace Manual do Utilizador descarregar pdf (Página 72)

3 General settings for exploratory and determination mode

797 VA Computrace – Software

* CV and CVS: Voltage step time = Voltage step / Sweep rate

** SqW: Voltage step time = 1 / Frequency

3.4 General operation sequence

Overview of operation sequence

The general operation sequence for measurements is identical for

both the exploratory and the determination mode and includes the

following steps:

1. Electrode test

Testing of the electrodes (only for oerating mode «Determina-

tion»).

2. Stirring

Optional stirring of the sample solution during preparation pro-

cedures until start of the equilibration time (details see Stirring).

3. Purging

Optional purging of the sample solution during the Initial purge

time

(details see Purging).

4. Drop formation

Hg drop formation at the MME if

DME, SMDE or HMDE is se-

lected (details see section 3.1).

5. Conditioning cycles

Optional conditioning of solid state electrodes by applying cy-

clic conditioning sweeps (details see Conditioning of solid state

electrodes).

6. Cleaning

Optional cleaning of solid state electrodes by applying a clean-

ing potential during the Cleaning time (details see

Pretreatment).

7. Deposition

Optional electrochemical deposition for stripping voltammetry

during the

Deposition time (details see Pretreatment).

8. Equilibration time

Waiting time before starting the sweep; with start potential

applied to the electrodes. If the checkbox

Hydrodynamic (meas-

Current range Voltage step time

10 nA > 50 ms

100 nA > 5 ms

1 μA

> 0.5 ms

10 μA

> 0.5 ms

100 μA

> 0.5 ms

1 mA > 0.5 ms

10 mA > 0.5 ms

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