Hanna Instruments HI 83206-2008 - Manual (Page 16)

30 31 Color of Water
COLOR OF WATER
SPECIFICATIONS
Range 0 to 500 PCU (Platinum Cobalt Units)
Resolution 1 PCU
Accuracy ±10 PCU ±5% of reading
Typical EMC ± 1 PCU
Deviation
Light Source Tungsten lamp with narrow band interference filter @ 420 nm
Method Adaptation of the Standard Methods for the Examination of Water and Wastewater,
18 th edition, Colorimetric Platinum Cobalt method.
REQUIRED ACCESSORIES
0.45 µm membrane for true color measurement.
For other accessories see page 73.
MEASUREMENT PROCEDURE
• Select the Color of Water method using the procedure described in
the Method Selection section (see page 12).
• Fill one cuvette up to the mark with deionized water and replace
the cap. This is the blank.
• Place the blank (# 1) 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 blank.
10 mL
# 1
# 1
• 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
4
2- ) and Dichromate
(Cr
2
O
7
2- ).
• 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