Metrohm 757 VA Computrace Manual de usuario descargar pdf (Pagina 127)

5.8 Data processing and evaluation

757 VA Computrace – Software

117

Evaluation quantity calculation

The peak evaluation quantity is identical for all peaks of a deter-

mination and must be set on the

Substances

tab of the

EDIT

WORKING METHOD PARAMETERS

window (see section 5.2). With

the aid of the calculated baselines, the set evaluation quantity

Height

Area

Derivative

is determined for each substance peak

and displayed as a result.

Peak voltage

Peak height

di/dU

Derivative

Peak area

Content calculation

With polarographic and voltammetric methods, the measured

evaluation quantities (

Height

Area

Derivative

) for a substance

are proportional to its mass concentration. The relation between

evaluation quantity and mass concentration must be determined

by a calibration with reference solutions. The 757 VA Computrace

offers the following two techniques for this:

• Standard addition

Content determination using single or multiple addition of a

standard solution.

• Calibration curve

Content determination using a calibration curve previously de-

termined with reference solutions.

The goal of these calibration methods is to calculate the sample

mass concentration c(s) which is defined by the found substance

mass

Mass

and the sample amount in the measuring vessel

Sam-

ple

amount

c(s) =

Mass / Sample amount

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