Bante Instruments 221 - Electrode Maintenance; Appendix; Preparation of Ion Standard Solution

23 I Ion
Electrode Maintenance
• Rinse the ion selective electrode thoroughly with distilled water
after use, wipe clean with a lint-free tissue, then replace
protective cap and store the electrode in a dry, cool and well-
ventilated area.
• Never scratch the ion sensitive membrane on the bottom of the
electrode.
• If the electrode response becomes sluggish, soak the electrode
in 100 ppm standard solution for at least 1 hour.
Appendix
Preparation of Ion Standard Solution (1000 ppm)
1. Half fill a 1 liter volumetric flask with distilled water and add the
analytical grade reagent according to the instructions in table
below.
Ion Type
Reagent
Weight
Ammonium
NH
4
Cl
2.97 g
Bromide
NaBr
1.29 g
Cadmium
Cd(NO
3
)
2
• 4H
2
O
2.74 g
Calcium
CaCl
2
• 2(H
2
O)
3.67 g
Chloride
NaCl
1.65 g
Cupric
Cu(NO
3
)
2
• 3H
2
O
3.80 g
Cyanide
NaCN
1.88 g
Fluoride
NaF
2.21 g
Iodide
NaI
1.18 g
Lead
Pb(NO
3
)
2
1.60 g
Nitrate
NaNO
3
1.37 g
Potassium
KCl
1.91 g
Silver
AgNO
3
1.57 g
Sodium
NaCl
2.54 g
Sulfide
Na
2
S • 9H
2
O
7.49 g
Ammonia
NH
4
Cl
3.15 g
2. Swirl the volumetric flask gently to dissolve the reagent and fill
to the mark with distilled water.
3. Cap and upend the volumetric flask several times to mix the
solution.
Optional Accessories
Ion Selective Electrodes
Order Code
Description
Range (ppm)
NH4-UK
Ammonium (NH
4
+
)
0.9 to 9000
Br-UK
Bromide (Br
-
)
0.4 to 81000
Cd-UK
Cadmium (Cd
2+
)
0.1 to 11200
Ca-UK
Calcium (Ca
2+
)
0.02 to 40100
CL-UK
Chloride (Cl
-
)
1 to 35500
Cu-UK
Cupric (Cu
2+
)
0.006 to 64000
Cn-UK
Cyanide (CN
-
)
0.03 to 260
F-UK
Fluoride (F
-
)
0.02 to 1900
I-UK
Iodide (I
-
)
0.06 to 127000
Pb-UK
Lead (Pb
2+
)
0.2 to 20800
NO3-UK
Nitrate (NO
3
-
)
0.4 to 62000
K-UK
Potassium (K
+
)
0.04 to 39000
Ag-UK
Silver (Ag
+
)
0.01 to 107900
Na-UK
Sodium (Na
+
)
0.002 to 69000
S-UK
Sulfide (S
2-
)
0.003 to 32000
NH3-UK
Ammonia (NH
3
)
0.02 to 17000
Standard Solutions
Order Code
Description
Volume
ION-NH4
1000 ppm ammonium standard
480 ml
ION-Br
1000 ppm bromide standard
480 ml
ION-Cd
1000 ppm cadmium standard
480 ml
ION-Ca
1000 ppm calcium standard
480 ml
ION-CL
1000 ppm chloride standard
480 ml
ION-Cu
1000 ppm cupric standard
480 ml
ION-F
1000 ppm fluoride standard
480 ml
ION-I
1000 ppm iodide standard
480 ml
ION-Pb
1000 ppm lead standard
480 ml
ION-NO3
1000 ppm nitrate standard
480 ml
ION-K
1000 ppm potassium standard
480 ml
ION-Ag
1000 ppm silver standard
480 ml
ION-Na
1000 ppm sodium standard
480 ml
Ion sensitive membrane