45-13
Method 8113
CHLORIDE (0 to 20.0 mg/L Cl
-
)
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.
2. Press: I/O
The display will show
455 nm
and module number
45.01
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
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.
5. Fill a 25-mL
sample cell to the
25-mL line with
demineralized water
(the blank).
6. Pipet 2.0 mL of
Mercuric Thiocyanate
Solution into each
sample cell. Swirl
to mix.
*Adapted from Zall, et. al., Analytical Chemistry, 1956, 28 (11), 1665
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