Lovibond Tintometer MD 100 Manual De Instrucciones página 27

Chlorine HR T / M103
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.
Conformity
EN ISO 7393-2
determination of free, combined and total |
a)
in the water sample caused by high concentration of calcium and/or high conductivity |
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alternative reagent, used instead of DPD No.1/No.3 in case of turbidity
e)
EN Method Reference Book 1.0
including stirring rod, 10 cm
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