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SURFACTANTS, ANIONIC
For water, wastewater and seawater
(Also called Detergents) Crystal Violet Method*
1.
Measure 300 mL
of sample in a 500-mL
separatory funnel.
Note: If sample cannot
be analyzed
immediately, see
Sampling and Storage
following these steps.
1 minute
4.
Add 30 mL of
benzene to the
separatory funnel.
Stopper and shake
gently for one
minute.
Note: Spilled reagent
will affect test accuracy
and is hazardous to skin
and other materials.
Note: Use benzene only
with adequate
ventilation.
*Adapted from Analytical Chemistry, 1966, 38, 791
5 seconds
2.
Add 10 mL of
Sulfate Buffer
Solution. Stopper
and shake the funnel
for five seconds.
5.
Place the
separatory funnel in a
support stand.
61-89
Method 8028
(0 to 0.300 mg/L)
3.
Add the contents
of one Detergent
Reagent Powder
Pillow. Stopper and
shake to dissolve.
30 minutes
6.
Wait 30 minutes.
Note: Excessive
agitation may cause an
emulsion to form,
requiring a longer time
for phase separation. If
this occurs, remove
most of the lower water
layer and gently agitate
the separatory funnel
with a clean inert object
(such as a Teflon-coated
magnetic stirring bar)
in the funnel.
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