Hanna-instruments HI 83205-2008 Manual do Utilizador descarregar pdf (Página 18)

34 35

• Reinsert the cuvette into the instrument.

• Press TIMER and the display will show the countdown prior to the

measurement or, alternatively, wait for 6 minutes and press READ.

When the timer ends the meter will perform the reading. The

instrument displays concentration in µg/L of chromium VI.

• Press the  or  to access the second level of functions.

• Press the Chem Frm functional key to convert the result in µg/L of Chromate (CrO

) and Dichromate

(Cr

• Press the  or  to go back to the measurement screen.

INTERFERENCES

Interference may be caused by:

Vanadium above 1 ppm. However, waiting 10 minutes before reading, the interference is removed

Iron above 1 ppm

Mercurous and mercuric ions cause slight inhibition of the reaction.

Chromium VI HR

CHROMIUM VI HIGH RANGE

SPECIFICATIONS

Range 0 to 1000 µg/L

Resolution 1 µg/L

Accuracy ±5 µg/L ±4% of reading

Typical EMC ±1 µg/L

Deviation

Light Source Tungsten lamp with narrow band interference filter @ 525 nm

Method Adaptation of the

ASTM Manual of Water and Environmental Technology, D1687-92

Diphenylcarbohydrazide method. The reaction between chromium VI and the reagent

causes a purple tint in the sample.

REQUIRED REAGENTS

Code Description Quantity

HI 93723-0 Powder reagent 1 packet

REAGENT SETS

HI 93723-01 Reagents for 100 tests

HI 93723-03 Reagents for 300 tests

For other accessories see page 73.

MEASUREMENT PROCEDURE

• Select the

Chromium VI HR

method using the procedure de-

scribed in the

Method Selection

section (see page 12).

• Fill the cuvette up to the mark with 10 mL of unreacted sample and

replace the cap.

• Place the cuvette into the holder and close the lid.

• Press ZERO key. The meter will show “-0.0-” when the meter is

zeroed and ready for measurement.

• Remove the cuvette and add the content of one packet of

HI 93723-0 reagent. Replace the cap and shake vigorously

for about 10 seconds.

10 mL

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