Hanna-instruments HI 83099 Bedienungsanleitung PDF herunterladen (Seite 64)

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Zinc

ZINC

SPECIFICATIONS

Range 0.00 to 3.00 mg/L

Resolution 0.01 mg/L

Accuracy ±0.03 mg/L ±3% of reading at 25 °C

Typical EMC ±0.01 mg/L

Deviation

Light Source Tungsten lamp with narrow band interference filter @ 575 nm

Method Adaptation of the

Standard Methods for the Examination of Water and Wastewater,

edition,

Zincon method. The reaction between zinc and the reagents causes an

orange to a dark violet tint in the sample.

REQUIRED REAGENT

Code Description Quantity

HI 93731A-0 Zinc Reagent 1 packet

HI 93731B-0 Cyclohexanone 0.5 mL

REAGENT SETS

HI 93731-01 Reagents for 100 tests

HI 93731-03 Reagents for 300 tests

For other accessories see page 132.

MEASUREMENT PROCEDURE

• Select the

Zinc

method using the procedure described in

the

Method Selection

section (see page 12).

• Fill one graduated mixing cylinder up to the 20 mL mark

with the sample.

• Add the content of one packet of HI 93731A-0 Zinc

reagent, close the cylinder and invert several times to mix

until completely dissolved.

• Fill one cuvette with 10 mL of the reacted sample up to

the mark.

20 mL

10 mL

• Add the content of one packet of HI 93751-0

Indicator reagent.

• Replace the cap and invert gently to mix

for 1 minute (about 30 inversions).

• Reinsert the cuvette into the instrument.

• Press Timer and the display will show the countdown prior to the measurement or, alternatively, wait

for 5 minutes and press Read. When the timer ends the meter will perform the reading.

• The instrument displays concentration in mg/L of Sulfate (SO

¯).

INTERFERENCES

Interferences may be caused by:

Calcium (as CaCO

) above 20000 mg/L

Chloride (as Cl¯) above 40000 mg/L

Magnesium (as MgCO

) above 10000 mg/L

Silica (as SiO

) above 500 mg/L

Color or suspended matter in large amounts will interfere: suspended matter should be removed by previous

filtration.

Organic matter in large amounts may impede the precipitation of barium sulfate.

Sulfate

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