Appendix 3: Result Calculations - Radiometer Analytical TitraLab 870 Reference Manual

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Appendix 3: Result calculations

Titration ends with determination of several volumes, corresponding to the different equivalent
points: Vepi.
The blank volumes are Bi.
Calculations are based on these volumes and you determine with which volume (or which
equivalent point) you want to work. In fact, in a method, you can have at least as much results
as equivalent points, but it is possible to have less by choosing the desired equivalent point.
Moreover, with several equivalent points, you can choose to work with the cumulated or the
subtracted volumes (volumes between equivalences).
1. Volume determination
This volume determination does not apply for the volume calculation in the back titration mode
concerning the blank option.
Normal V1 = Veq1
Vi = Veqi
With For EP titration: Vi = Veqi - Bi
For IP titration and B applied to eq2:
blank
V1 = Veq1
V2 = Veq2 - B
Vi = Veqi - B
2. Direct titration
If sample is expressed in volume:
If sample is expressed in weight:
If the sample is diluted, the above equations are also multiplied by Vdil/Val, to have the
concentration in the original sample.
- Vi: volume of titrant at the equivalence (ml)
- C : titrant concentration
reag
- Vs: sample volume in ml
- ms: sample amount in g
- c: conversion factor
- Vdil: dilution volume
- Val: aliquot volume
Cumulated volume
Vi
--------------------------- -
Csmp =
Vi
--------------------------- -
Csmp =
TitraLab 870 Reference Manual
Subtracted volume
V1 = Veq1
Vi = Veqi - Veq(i-1)
For EP titration:
For IP titration and B applied to eq2:
V1 = Veq1
V2 = Veq2 - Veq1 - B
Vi = Veqi - Veq(i-1)
×
Creag
×
c
Vs
×
Creag
×
c
s
m
Vi = Veqi - Veq(i-1) - Bi
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