Metrohm 757 VA Computrace Manuel d'utilisateur télécharger pdf (Page 41)

3.2 VA measurement modes

757 VA Computrace – Software

3.2 VA measurement modes

DP – Differential Pulse

General:

DP or Differential Pulse voltammetry is the most universal and

frequently used voltammetric measurement mode. It is equally

well suited for irreversible and reversible systems and offers a

high sensitivity. The DP measurement mode can be set for the

exploratory and determination mode by selecting

DP - Differential

pulse

for the

Mode

parameter in the

EXPLORATORY SPECIFICATION

WORKING METHOD SPECIFICATIONS

window.

Description:

For DP voltammetry, rectangular pulses with a constant amplitude

are superimposed on a stepwise rising direct voltage ramp. The

current i is measured as a function of the voltage U immediately

before the pulse and at the end of the pulse. From the differences

between the two current measurements, peak-shaped curves are

obtained which are evaluated using linear, polynomial or expo-

nential baselines.

Start potential

Pulse

amplitude

Voltage step

Pulse

time

Voltage step time

Peak voltage

Peak

height

i = i2 - i1

t (

)t (

)

t (

)

t (

)

1 2 ... 36 37 38 39 40 41 42 43 44 45 46 ... 197 198

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Metrohm 757 VA Computrace Manuel d'utilisateur Page 41

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