Hanna-instruments HI 96721C Manual do Utilizador descarregar pdf (Página 15)

Calcium (Ca

): above 10,000 mg/L as CaCO

Copper (Cu

): does not interfere: reagent contains a masking

agent.

Magnesium (Mg

): above 100,000 mg/L as CaCO

Molybdate Molybdenum: above 25 mg/L (as Mo-MoO

) (positive error)

Sample containing up to 50 mg/L Mo-MoO

may

be measured if a reading is taken after 1 minute

instead of 3 minutes.

High Iron concentrations: up to 200 mg/L do not inhibit color development;

above 200 mg/L color development may be inhibited.

High sulfide concentrations (S

): high sulfide concentrations may interfere

To reduce sulfide: acidify the sample and boil for

about 20 minutes, neutralize and adjust volume

before measurements.

Silica (SiO

): above 175 mg/L (as SiO

). May slow down color

development (negative error)

VALIDATION PROCEDURE

Use the validation procedure to ensure that the instrument is properly calibrated.

Warning: Do not validate the instrument with any standard solutions other than the HANNA CAL

CHECK

Standards, otherwise erroneous results will be obtained.

• Turn the meter on by pressing ON/OFF.

• Place the CAL CHECK

Standard

HI 96721-11 Cuvette A into the cuvette

holder and ensure that the notch on the

cap is positioned securely into the groove.

• When the beeper sounds briefly and the

LCD displays dashes, the meter is ready.

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Hanna-instruments HI 96721C Manual do Utilizador Página 15