Instruments Direct (Services) Ltd

Ion-Selective Electrodes

General Information

Ion-Selective Electrode

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Our Ion-Selective Electrodes are great for monitoring four environmentally important ions: Nitrate (NO3-), Chloride (Cl-), Calcium (Ca2+) and Ammonium (NH4+).

Features:

Electrodes are combination-style, non-refillable and gel-filled. It is important for you to know that the PVC membranes of the Nitrate, Calcium and Ammonium ISEs have a limited life expectancy of one to two years. This is true of all ISEs with PVC membranes. Replacement modules for these ISEs allow you to simply discard the used one and replace it with a new module. We recommend that you do not purchase replacement modules far in advance of their expected time of use as their life expectancy is limited as well. The Chloride ISE has a solid state membrane and therefore does not need to be replaced. Included with each ISE are two calibration standards and a short-term soaking bottle.

Click here to download User Guide and Technical Info

General Specifications:

Electrode Resistance: 1 to 4 MΩ
Reproducibility: ± 5% of reading
Temperature range (can be placed in): 0 to 50°C (no temperature compensation)
Minimum immersion: 1 inch
Electrode Length: 155 mm
Body Diameter: 12 mm
Cap Diameter: 16 mm
Cable Length: 100 cm
Ammonium Ion-Selective Electrodes

Ammonium Ion-Selective Electrode

The Ammonium Ion-Selective Electrode (ISE) can be used to measure the concentration of Ammonium (NH4+) in aqueous samples.

Use the Ammonium ISE to measure levels of ammonium ions introduced from fertilizers. It can also indicate aqueous ammonia levels if sample solutions are acidified to convert NH3 to NH4+.

The Ammonium ISE has a combination-style, non-refillable, gel-filled electrode. Like all other PVC ISE membranes, the membrane on the ISE has a limited life expectancy. However, the replaceable module of ISE allows you to simply discard the used membrane module, and replace it with a new one.

Note: We recommend that you do not purchase ISE replacement modules too far in advance of their expected time of use as degradation occurs while they are stored on the shelf.

Order Code: VR105648 Price £

Range: 0.10 to 18,000 mg/L or ppm (5.5x10-6 M to 1.0 M)
Resolution (LabQuest, LabQuest Mini, Go!Link, LabPro):
  % of reading: 0.7%
  Low scale reading: 1.8 ±0.013
  High scale reading: 35,500 ±250 mg/L
pH Range: 4 to 7.5
Interfering Ions: K+
Electrode Slope (log voltage vs. concentration): +56 mV/decade

Replacement Parts and Spares

ISE Ammonium Replacement Module. Order Code: VR106248 Price £

ISE Ammonium Low Standard. Order Code: VR106256 Price £

ISE Ammonium High Standard. Order Code: VR106264 Price £

Experiments:

Water Quality with Vernier

Measure the concentration of ammonium nitrogen in a stream or lake using an Ammonium Ion-Selective Electrode (ISE).

Taken from the Water Quality with Vernier Lab Book.

Download Experiment Preview. The student-version preview includes:

  • Step-by-step instructions for computer-based data collection
  • List of materials and equipment

Note: The experiment preview of the computer edition does not include essential teacher information, safety tips, or sample data. Instructions for Logger Pro and other software (such as LabQuest App or TI handheld software, where available) are on the CD that accompanies the book. We strongly recommend that you purchase the book before performing experiments.

Calcium Ion-Selective Electrodes

Calcium Ion-Selective Electrode

The Calcium Ion-Selective Electrode (ISE) can be used to measure the concentration of Calcium (Ca2+) in aqueous samples.

Data from the Calcium ISE can give a good indication of hardness of water (as Ca2+). The concentration of Calcium is also used as an endpoint indicator in EDTA-Ca/Mg hardwater titrations.

The Calcium ISE has a combination-style, non-refillable, gel-filled electrode. Like all other PVC ISE membranes, the membrane on the ISE has a limited life expectancy. However, the replaceable module of ISE allows you to simply discard the used membrane module, and replace it with a new one.

Note: We recommend that you do not purchase ISE replacement modules too far in advance of their expected time of use as degradation occurs while they are stored on the shelf.

Order Code: VR105656 Price £

Range: 0.20 to 40,000 mg/L or ppm (5x10-6 M to 1.0 M)
Resolution (LabQuest, LabQuest Mini, Go!Link, LabPro):
  % of reading: 1.4%
  Low scale reading: 0.20 ±0.00281.8
  High scale reading: 40,000 ±560 mg/L
pH Range: 3 to 10
Interfering Ions: Pb2+, Hg2+, Sr2+, Cu2+, Ni2+
Electrode Slope (log voltage vs. concentration): +28 mV/decade

Replacement Parts and Spares

ISE Calcium Replacement Module. Order Code: VR106280 Price £

ISE Calcium Low Standard. Order Code: VR106288 Price £

ISE Calcium High Standard. Order Code: VR106296 Price £

Experiments:

Water Quality with Vernier

Measure the calcium ion concentration in a stream or lake, in mg/L as Ca2+, using a Calcium Ion-Selective Electrode (ISE). Determine the calcium hardness as CaCO3 in mg/L.

Taken from the Water Quality with Vernier Lab Book.

Download Experiment Preview. The student-version preview includes:

  • Step-by-step instructions for computer-based data collection
  • List of materials and equipment

Note: The experiment preview of the computer edition does not include essential teacher information, safety tips, or sample data. Instructions for Logger Pro and other software (such as LabQuest App or TI handheld software, where available) are on the CD that accompanies the book. We strongly recommend that you purchase the book before performing experiments.

Chloride Ion-Selective Electrodes

Chloride Ion-Selective Electrode

The Chloride Ion-Selective Electrode is used to measure the concentration of Chloride (Cl-) in aqueous samples.

The concentration of the Chloride ion gives a quick measurement of salinity of water samples. Use the Chloride ISE to measure chloride levels in ocean saltwater or salt in food samples.

The Chloride ISE has a combination-style, non-refillable, gel-filled electrode. Unlike other ISEs available from Vernier, the Chloride ISE has a solid-state membrane that does not need to be replaced.

Order Code: VR105664 Price £

Range: 1.8 to 35,500 mg/L or ppm (5x10-5 M to 1.0 M)
Resolution (LabQuest, LabQuest Mini, Go!Link, LabPro):
  % of reading: 0.7%
  Low scale reading: 1.8 ±0.013
  High scale reading: 35,500 ±250 mg/L
pH Range: 2 to 12
Interfering Ions: CN-, Br-, I-, S2-
Electrode Slope (log voltage vs. concentration): -56 mV/decade

Replacement Parts and Spares

ISE Chloride Low Standard. Order Code: VR106312 Price £

ISE Chloride High Standard. Order Code: VR106320 Price  £

Experiments:

Water Quality with Vernier

Measure the chloride ion concentration in a stream or lake using a Chloride Ion-Selective Electrode. Measure the salinity value of the water (in ppt) using a Conductivity Probe.

Taken from the Water Quality with Vernier Lab Book.

Download Experiment Preview. The student-version preview includes:

  • Step-by-step instructions for computer-based data collection
  • List of materials and equipment

Note: The experiment preview of the computer edition does not include essential teacher information, safety tips, or sample data. Instructions for Logger Pro and other software (such as LabQuest App or TI handheld software, where available) are on the CD that accompanies the book. We strongly recommend that you purchase the book before performing experiments.

Nitrate Ion-Selective Electrodes

Nitrate Ion-Selective Electrode

The Nitrate Ion-Selective Electrode (ISE) can be used to measure the concentration of Nitrate (NO3-) in aqueous samples.

Nitrate concentration, which can be increased by acidic rainfall, fertilizer runoff from fields, and plant or animal decay or waste, is an important parameter in nearly all water quality studies. Use the Nitrate ISE to determine the concentration of the nitrate ion in a water sample.

The Nitrate ISE has a combination-style, non-refillable, gel-filled electrode. Like all other PVC ISE membranes, the membrane on the ISE has a limited life expectancy. However, the replaceable module of ISE allows you to simply discard the used membrane module, and replace it with a new one.

Note: We recommend that you do not purchase ISE replacement modules too far in advance of their expected time of use as degradation occurs while they are stored on the shelf.

Order Code: VR105672 Price £

Range: 0.10 to 14,000 mg/L or ppm (7x10-6 M to 1.0 M)
Resolution (LabQuest, LabQuest Mini, Go!Link, LabPro):
  % of reading: 0.7%
  Low scale reading: 0.10 ±0.0007
  High scale reading: 14,000 ±98 mg/L
pH Range: 2.5 to 11
Interfering Ions: CIO4-, I-, ClO3-, CN-, BF4-
Electrode Slope (log voltage vs. concentration): -56 mV/decade

Replacement Parts and Spares

ISE Nitrate Replacement Module. Order Code: VR106336 Price £

ISE Nitrate Low Standard. Order Code: VR106344 Price £

ISE Nitrate High Standard. Order Code: VR106352 Price £

Experiments:

Water Quality with Vernier

Determine the concentration of nitrate ions, NO3-, in a water sample from a stream or lake.

Taken from the Water Quality with Vernier Lab Book.

Download Experiment Preview. The student-version preview includes:

  • Step-by-step instructions for computer-based data collection
  • List of materials and equipment

Note: The experiment preview of the computer edition does not include essential teacher information, safety tips, or sample data. Instructions for Logger Pro and other software (such as LabQuest App or TI handheld software, where available) are on the CD that accompanies the book. We strongly recommend that you purchase the book before performing experiments.

Potassium Ion-Selective Electrodes

Potassium Ion-Selective Electrode

The Potassium Ion-Selective Electrode can be used to measure the concentration of potassium (K+) ions in aqueous solutions

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.

Order Code: VR129576 Price £

Click here to download full specification and user guide.

Range: 90 - 39,000 mg/L (or parts per million)
pH Range: 2 to 12
Interfering Ions: Rb2+, Cs2+, NH4+, Ca2+, Mg2+, Li+
Temperature Range: 0 - 40°C (not compensated)
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

Replacement Parts and Spares

ISE Potassium Replacement Module. Order Code: VR129600 Price £

ISE Potassium Low Standard. Order Code: VR129592 Price £

ISE Potassium High Standard. Order Code: VR129584 Price £

 

* All prices are exclusive of delivery & VAT. E&OE.