Hach DR/700 Procedures Manual page 185

CHLORIDE
For water and wastewater
Mercuric Thiocyanate Method*
1.
Install module
number
45.01
in a DR/700.
Note: Samples can be
stored for at least 28
days at room
temperature in glass or
plastic bottles.
4.
Fill a 25-mL
sample cell to the
25-mL line with
sample.
Note: Filter turbid
samples through a
moderately rapid filter
paper before analysis.
Note: For proof of
accuracy, use a 10.0 mg/L
chloride standard
(preparation given in
Accuracy Check) in
place of the sample.
*Adapted from Zall, et. al., Analytical Chemistry, 1956, 28 (11), 1665
(0 to 20.0 mg/L Cl
2.
Press:
I/O
The display will show
455 nm
and module number
45.01
5.
Fill a 25-mL
sample cell to the
25-mL line with
demineralized water
(the blank).
45-13
Method 8113
-
)
3.
After 2 seconds,
the display will show
a program number,
the concentration
units and the zero
prompt. If necessary,
press the
UP ARROW
key until the lower
display shows
program number
45.02.1
6.
Pipet 2.0 mL of
Mercuric Thiocyanate
Solution into each
sample cell. Swirl
to mix.