Metrohm 757 VA Computrace Manual de usuario descargar pdf (Pagina 189)

8.6 Voltammetric problems

757 VA Computrace – Software

179

Calibration with chemically non-isoformal standards

With both possible calibration techniques, it must be ensured that

the standards used for calibration are chemically isoformal with

the analytes. The standard substances must therefore have the

same valency (e.g. with Fe, Al) or complex formation form (e.g.

with As, Cr, Se) as the substances already present in the analysis

solution. If this is not the case the calibration can produce com-

pletely wrong results owing to the different peak voltages and

sensitivities.

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Metrohm 757 VA Computrace Manual de usuario Pagina 189