42
Chromium VI HR
CHROMIUM VI HIGH RANGE
SPECIFICATIONS
Range
0 to 1000
μ
g/L
Resolution
1
μ
g/L
Accuracy
±5
μ
g/L ±4% of reading at 25 °C
Typical EMC
±1
μ
g/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 132.
MEASUREMENT PROCEDURE
• Select the
Chromium VI HR method using the procedure described in
the
Method Selection section (see page 12).
• Fill the cuvette with 10 mL of unreacted sample (up to the mark) and
replace the cap.
• Place the cuvette into the holder and close the lid.
• Press the
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