Hanna-instruments HI 93710 Manual do Utilizador descarregar pdf (Página 33)

INTERFERENCES

Interference may be caused by:

Chlorine

Iodine

Ozone

Oxidized forms of chromium and manganese

Alkalinity above 300 mg/L and acidity above 150 mg/L as CaCO

require neutralization since the color could instantly fade. To resolve

this, neutralize the sample with diluted HCl or NaOH.

In case of water with hardness greater than 500 mg/L CaCO

, shake

the sample for approximately 1 minute after adding the reagent.

Bromine

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Hanna-instruments HI 93710 Manual do Utilizador Página 33