Hanna-instruments HI 83200-01 Manual de usuario descargar pdf (Pagina 23)

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• 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 LR

CHROMIUM VI LOW RANGE

SPECIFICATIONS

Range 0 to 300 µg/L

Resolution 1 µg/L

Accuracy ±1 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 93749-0 Powder reagent 1 packet

REAGENT SETS

HI 93749-01 Reagents for 100 tests

HI 93749-03 Reagents for 300 tests

For other accessories see page 128.

MEASUREMENT PROCEDURE

• Select the

Chromium VI LR

method using the procedure described 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 93749-0 reagent. Replace the cap and shake vigorously

for about 10 seconds.

10 mL

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