O.OlM
Sodium Lauryl Sulfate
(SLS) To prepare this titrant from your own laboratory stock, add 2.883 grams
sodium lauryl sulfate (SLS) to a one liter volumetric flask about half full of distilled
water. Swirl the flask to dissolve the solid and fill to the mark with distilled water.
Cap the flask and invert several times to mix the solution.
3.
Sample Additive, diluted Triton X- 100, to keep electrodes clean when added to all
cationic
surfactants is
NaOH to a 1 liter volumetric flask about half full of
de-ionized water. Swirl the flask to dissolve the solid and fill to the mark with
distilled water. Cap the flask and invert several times to mix the solution.
3.
Titrant for the titration of
0.05M
To prepare this titrant from your own laboratory stock, add 22.405 grams of
Hyamine 1622 and 5 ml of 1 M
pipet
or burette.
3.
ISE-8882 Surfactant Electrode (glass)
Required Solutions
1.
Distilled or de-ionized water to prepare all solutions and standards.
2.
Titrant for the titration of anionic surfactants is Hyamine 1622,
pH/mV meter, either line operated or portable.
2.
A hand controlled delivery system, such as a 10 ml
O.OlM
sodium lauryl sulfate (sodium dodecyl sulfate) titrant, and one 50 ml
bottle of sample additive, diluted Triton X- 100.
Required Equipment
1.
A
0.05M
Hyamine 1622 (benzethonium chloride) titrant,
one 50 ml bottle of
cationic
surfactants in solution. Titration procedures for manual titrations are discussed
in this manual, though adaptation to automatic titration techniques is quite simple. The electrode
comes packaged with one 50 ml bottle of
OMEGA ENGINEERING
ISE-8882 ION SELECTIVE ELECTRODE FOR SURFACTANT
INSTRUCTION MANUAL
GENERAL INSTRUCTIONS
Introduction
The Omega ISE-8882 Surfactant Electrode indicates the potentiometric endpoint when titrating
anionic or
O.OOOlM
SLS for
10 minutes before using the electrode each day. Use fresh solution daily. The electrode is now
ready for use.
Connect the electrode(s) to the proper terminal(s) as recommended by the meter manufacturer.
If the stock solution becomes cloudy or contaminated in any way, discard it.
Titrant Preparation
Based on the recommendations found in
Required Solutions,
select an appropriate titrant.
Determine the concentration of titrant needed for the analysis from Table 1.
O.OlM
SLS to 100 ml with distilled water. Prior to
first usage, or after long-term storage, soak the tip of the surfactant electrode in
O.OOOlM
SLS by diluting 1 ml of the
NaOH
diluted to 1000 ml for alkaline rinse (polyacrylate analysis).
GENERAL PREPARATION
Electrode Preparation
Remove the rubber cap(s) covering the electrode tip(s) and the rubber insert covering the filling
hole of the reference electrode. Fill the combination electrode or the reference electrode with the
filling solution shipped with the electrode to a level just below the fill hole. No preparation is
required with a sealed reference electrode. Gently shake the electrode downward in the same
manner as a clinical thermometer to remove any air bubbles which might be trapped behind the
surfactant membrane.
Prepare
1M
cationic
surfactant analysis) and 50 ml 0.
HCl diluted to 1000 ml
for acidic rinse (anionic or
1M
NaOH).
6.
Electrode Rinse Solutions consisting of about 50 ml 0.
(O.lM HCl) and polyacrylates
(O.OlM
cationic
surfactantspH of both anionic and pH Adjuster Solutions for adjusting the
Ag’), for filling the reference chamber of
the electrode.
5.
samples. To prepare, add 10 ml of reagent-grade Triton X-100 to a one liter volumetric
flask about half full of distilled water. Cap the flask and invert several times to mix the
solution.
4.
Electrode Filling Solution, 4M KC1 (with