Environmental Express 99561-78, Инструкция по эксплуатации

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V1_04.2022 15
Chemical Method
DPD
Interferences
Persistant Interferences
• All oxidizing 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 from / [mg/L]
CrO
4
2-
0.01
MnO
2
0.01
Method Validation
Limit of Detection 0.01 mg/L
Limit of Quantification 0.03 mg/L
End of Measuring Range 2 mg/L
Sensitivity 1.68 mg/L / Abs
Confidence Intervall 0.033 mg/L
Standard Deviation 0.014 mg/L
Variation Coefficient 1.34 %
Conformity EN ISO 7393-2
Chlorine PP / 0.02 - 2 mg/l / CL2