Potassium Ion-Selective Electrode

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The Potassium Ion-Selective Electrode can be used to measure the concentration of potassium (K+) ions in aqueous solutions. Description The Potassium Ion-Selective Electrode makes the measure of potassium ions portable. When used with a Vernier LabQuest 2, the Potassium ISE can be used to take
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Descripción
The Potassium Ion-Selective Electrode can be used to measure the concentration of potassium (K+) ions in aqueous solutions.

Description

The Potassium Ion-Selective Electrode makes the measure of potassium ions portable. When used with a Vernier LabQuest 2, the Potassium ISE can be used to take readings in the field – at lakes or streams. This sensor is easier to set up and use than other methods of measuring potassium ion concentration in aqueous solutions. Because it is a stick-style sensor, its use is similar to using a conductivity probe or a pH sensor in a laboratory setting or in the field.

Ion-Selective Electrodes require good chemical technique and careful calibration to obtain accurate results. They are not recommended for middle school or elementary students.

We recommend that you do not purchase Potassium Ion-Selective Electrode replacement modules too far in advance of their expected time of use; degradation occurs while replacement modules are stored on the shelf.

Specifications

Range: 90 – 39,000 mg/L (or parts per million)
pH range: 2 – 12
Temperature Range: 0 – 40°C (not compensated)
Interfering Ions: Rb2+, Cs2+, NH4+, Ca2+, Mg2+, Li+
Electrode Resistance: >50 mΩ
Electrode Slope: 56 +/- 4 mV/decade at 25°C
Calibration Voltage (typical): 2.7 V (1000 ppm), 1.9 V (10 ppm)
Reproducibility (precision): +/- 11% of full scale
Minimum sample size: 3 mL in a 50 mL beaker
Accuracy: +/- 16% of full scale

What’s Included

Vernier Potassium Ion-Selective Electrode
30 mL bottle of High Standard Standard (1000 mg/L)
30 mL bottle of Low Standard Standard (10 mg/L)
ISE soaking bottle (empty bottle with insertion cap)
User manual
Sensor Requirements

The Potassium Ion-Selective Electrode requires a compatible interface and software to collect data. Interface and software sold separately. Getting started with probeware »

Compatible Interfaces
The Potassium Ion-Selective Electrode is compatible with these interfaces:

LabQuest 2
LabQuest
LabQuest Mini
Go!Link
SensorDAQ
Vernier LabPro
Vernier EasyLink
CBL 2
TI-Nspire Lab Cradle
Software Requirements
The Potassium Ion-Selective Electrode requires data-collection software:

For computers, Logger Pro 3.8.6.1 or newer. Download free update »
For LabQuest 2, LabQuest App 2.2 or newer. Download free update »
For LabQuest, LabQuest App 1.7.1 or newer. Download free update »
For TI-84 and 83 Plus Silver Edition, EasyData 2.4 or newer. Download free update »
For TI-Nspire, DataQuest software
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