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Chlorine PP / M110
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.
• Concentrations above 2 mg/L Chlorine, in the event of using Powder Packs, can lead
to results within the measuring range of up to 0 mg/L. In this case, 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
determination of free, combined and total
a)
42
from / [mg/L]
0,01
0,01
0.01 mg/L
0.03 mg/L
2 mg/L
1.68 mg/L / Abs
0.033 mg/L
0.014 mg/L
1.34 %
EN Method Reference Book 1.0
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