52
53
Cyanide
Note: Pay attention to the way the spoon is filled:
- do not press the powder;
- do not overfill it.
• Place the HDPE plastic stopper and cap immediately, to prevent the
escape of chlorine gas which is developed during the reaction, and
shake gently for 30 seconds.
• Wait for 30 seconds leaving the cuvette tightly capped and undis-
turbed, then add the content of one packet of HI 93714B-0 reagent
and shake gently for 10 seconds.
• Immediately add the content of one packet of HI 93714C-0 reagent,
replace the cap and shake vigorously for 20 seconds.
• Reinsert the cuvette into the instrument.
• Press TIMER and the display will show the countdown prior to the
measurement or, alternatively, wait for 25 minutes and press
READ. When the timer ends the meter will perform the reading.
Note
:
Gently shake the cuvette 4 or 5 times during the first 20 minutes of the countdown prior to the
measurement. Accuracy is not affected by undissolved reagent powder.
• The instrument displays the results in mg/L of cyanide.
Cyanide
CYANIDE
SPECIFICATIONS
Range
0.000 to 0.200 mg/L
Resolution
0.001 mg/L
Accuracy
±0.005 mg/L ±3% of reading
Typical EMC Dev.
±0.001 mg/L
Light Source
Tungsten lamp with narrow band interference filter @ 610 nm
Method
Adaptation of the
Standard Methods for the Examination of Water and Wastewater,
18
th
edition, Pyridine-Pyrazolone method. The reaction between cyanide and reagents
causes a blue tint in the sample.
REQUIRED REAGENTS
Code
Description
Quantity
HI 93714
A
-0
Reagent A
1 spoon
HI 93714
B
-0
Reagent B
1 packet
HI 93714
C
-0
Reagent C
1 packet
REAGENT SETS
HI 93714-01
Reagents for 100 tests
HI 93714-03
Reagents for 300 tests
For other accessories see page 128.
MEASUREMENT PROCEDURE
• Select the
Cyanide 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 ZERO key. The meter will show “-0.0-” when the meter is
zeroed and ready for measurement.
• Remove the cuvette and add 1 level spoon of HI 93714A-0 Cyanide
Reagent. Remember to close the reagent bottle immediately after
use.
10 mL
