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.
Important: Ion-Selective Electrodes require good chemical technique and careful calibration to obtain accurate results; they are not recommended for middle school or elementary students.
View the Calcium Ion-Selective Electrode user manual
- Range (concentration): 1 to 40,000 mg/L (or ppm)
- Interfering Ions: Pb2+, Hg2+, Sr2+, Cu2+, Ni2+, NH3, Na+, Li+, K+, Ba2+, Zn2+, Mg2+
- pH Range: 2 to 8
- Temperature range: 0 to 40°C
- Electrode Slope: +26 mV
- Electrode Resistance: 100 MΩ
- Immersion: 2.8 cm (1.1 in)
Experiments and Lab Ideas
Water Quality with Vernier (1)
Includes student instructions, teacher tips, safety information, and sample data.Go to Book Page
Lab Ideas and Innovative Uses
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The Calcium Ion-Selective Electrode may require a compatible interface and software. Choose a platform below to see compatible interface and software options.
The Calcium Ion-Selective Electrode is fully supported with LabQuest 2 (version 2.8.1), a standalone data logger with built-in graphing and analysis software.
Learn more about LabQuest 2 »
You can also use the Calcium Ion-Selective Electrode with these platforms:
- Vernier Calcium Ion-Selective Electrode
- 30 mL bottle of Calcium Low Standard (10 mg/L)
- 30 mL bottle of Calcium High Standard (1000 mg/L)
- Short-term ISE soaking bottle
- User manual
All prices are for U.S. educators.
Educational use only: Vernier products are designed for educational use. They are not appropriate for industrial, medical, or commercial applications. Product usage disclaimer »