Ionode IJ pH V5.1 - Manual (Page 25)

Ionode IJ Instruction Manual 25
4.5.3. Sleeve Electrolytes
The IJ reference system allows a variety of
sleeve electrolytes. For high viscosity samples
which contaminate the membrane and junction
quickly, aqueous saturated potassium chloride
may be preferred, with frequent renewal. For
low viscosity samples, Ionode
’s Potassium
Chloride Gel Electrolyte requires less frequent
replacement. Other specialized electrolytes can
also be used.
Ionode Potassium Chloride Gel Electrolyte
Table 3: Composition of 3M Potassium
Chloride Gel Electrolyte
CAS# Components % (w/v)
7447-40-7 Potassium Chloride 20-25
9004-62-0 Hydroxyethyl
Cellulose
1-5
112-27-6 Triethylene Glycol 5-10
7732-18-5 Water To 100%
Note: CAS refers to the Chemical Abstracts
Service Registry Number.
MSDS for the gel is available here
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Saturated Potassium Chloride
Dissolve 34g of potassium chloride in 100mL of
distilled water. Use the supernatant.
1M Potassium Nitrate
Add 10.1g of AR grade KNO
3
to a 100ml
volumetric flask and make up to the mark with
distilled water. This electrolyte can be used
where chloride ions cause interference (i.e.
Ag
+
). Also use in the IJ14 when used with
Iodide/Cyanide and Chloride ISE’s.