®
Potassium ISE Probe
Introduction
2
012-15722A
Introduction
This Potassium Ion Selective Electrode (ISE) Probe is a
combination electrode that includes both reference and
sensing half cells in one body housing. It is used for
measuring potassium ion (K
+
) activity in aqueous sam
-
ples.
Technology: Replaceable Polymer/PVC Membrane
(Potassium ISE Replacement Module PS-3551)
Overview
Required Equipment
•
PASCO Wireless pH/ISE/ORP Sensor (PS-3204)
or
•
PASPORT High Precision pH/Temperature with
ISE/ORP Amplifier (PS-2107) with a PASCO
interface (see www.pasco.com for information)
or
•
Ion meter or pH/mV meter
•
PASCO data collection software (see
www.pasco.com)
•
Wash bottle filled with distilled or de-ionized water
•
Lab wipes
•
Pipettes: 1 mL, 10 mL and 100 mL
•
Clean beakers*
*SE-7287 100 ml Beakers (12 pack) or SE-7288 1000 ml
Beakers (6 pack)
Included Required Solutions*
•
Reference Fill Solution
•
1000 ppm Potassium Standard Solution
•
Ionic Strength Adjuster (ISE)
(*SC-3535 Potassium ISE Solutions)
Electrode Preparation
Replace the Module Blank
This electrode performs better when the reference
junction is kept wetted during transit and storage.
However, the sensor module is best stored and
transported dry. Therefore, the electrode is shipped with
a plastic Module Blank inside that must be removed prior
to use.
1. Unscrew the cap of the storage solution bottle (also
known as “Soaker Bottle”) and remove the
electrode. Unscrew the plastic Module Blank from
the end of the electrode. Replace the blank with the
included Potassium ISE Replacement Module.
•
The Module Blank can be retained for long term
storage.
•
Caution: Do not touch the PVC sensor membrane
on the end of the Potassium ISE Replacement Mod
-
ule with your fingers.
2. Thoroughly rinse the electrode with distilled water.
Wipe carefully with a clean lab wipe.
3. Return the electrode to the storage bottle when it is
not in use.
Fill the Electrode with Electrolyte
The reference (outer) chamber must be filled with
Reference Fill Solution and remain open during testing:
Size and Material
Body (Epoxy): 12 mm OD x 155
mm Length
Cap (ABS): 16 mm OD x 57 mm
Length
Reference
Double-junction Ag/AgCl, ceramic
pin junction, refillable, sodium
chloride electrolyte
Features
Replaceable Sensor Module
Range
0.04 to 39,000 mg/L
Reproducibility
±4%
Slope
54 to 59 mV/decade @ 25°C
typical
pH Range
2 to 12
Operating Temperature 0 to 40°C
Interferences
Cs
+
, NH
4
+
, Tl
+
, H
+
, Ag
+
, Tris
+
,
Na
+
, Li
+
, others
Application/Notes
Very popular for environmental,
industrial, agriculture,
food/beverage
