Tintometer Lovibond MD 100 Mode D'emploi page 11

Chlorine T / M100
Chemical Method
DPD
Appendix
Interferences
EN
Persistant Interferences
• All oxidising agents in the samples react like chlorine, which leads to higher results.
Removeable Interferences
• Interference from copper and iron (III) are eliminated by the addition of EDTA.
• The use of reagent tablets in samples with high calcium content* and/or
high conductivity* can lead to turbidity of the sample and therefore incorrect
measurements. In this case, the alternative reagent tablet DPD No.1 High Calcium
and reagent tablet DPD No.3 High Calcium should be used.
*it is not possible to give exact values, because the development of turbidity depends
on the composition and nature of the sample.
• Concentrations above 10 mg/L chlorine, in the event of using fluid reagents, can
lead to results within the measuring range of up to 0 mg/L. In the event of a high
concentration of chlorine, the sample must be diluted with chlorine-free water. 10
mL of the diluted sample should be mixed with the reagent and the measurement
taken again (plausibility test).
Interference
CrO
2-
4
MnO
2
Method Validation
Limit of Detection
Limit of Quantification
End of Measuring Range
Sensitivity
Confidence Intervall
Standard Deviation
Variation Coefficient
Conformity
EN ISO 7393-2
12
from / [mg/L]
0.01
0.01
0.02 mg/L
0.06 mg/L
6 mg/L
2.05 mg/L / Abs
0.04 mg/L
0.019 mg/L
0.87 %
EN Method Reference Book 1.0