The folks here at MeasureNet have been hard at work integrating new probes into our system and creating new experiments. In this blog entry we'll be introducing the following new experiments and probes:
- Thermometric Titrations
- Conductivity Probe & Experiment Options
- Colorimetric Titration Hardware
Thermometric Titrations
The newest software integrates the drop counter and temperature probe and now has the capability to conduct experiments with Temperature vs Drops. This allows users to conduct Thermometric Titrations.
Conductivity Probe & Experiment Options
MeasureNet now offers a 4 range high resolution conductivity probe. MeasureNet provides users the ability to conduct experiments with Conductivity vs Time and use the drop counter for Conductivity vs Volume for Conductometric Titrations.
Colorimetric Titration Hardware
MeasureNet systems now have the ability to conduct colorimetric, Fluorometric, turbidometric and chemiluminescent titration experiments. When ordering colorimeters, customers can specify if they would like them customized for photometric titrations. The kit includes a colorimeter, a base stand, a pump with power supply, and custom-made flow cell that pair with the MeasureNet colorimeter and drop counter.
Development of MeasureNet’s optical drop counter began in 2000. Our goal was not only to automate, simplify and shorten the time for pH titration experiments, but also to improve the accuracy of students’ measurements. During its development, various innovative features were added to the design, as seen in Figure 1. MeasureNet’s Multi-Functional Drop Counter holds both a pH probe and a temperature probe, reducing the hardware needed to set up pH titration experiments, and the geometry was optimized to allow the use of small beakers and samples.
Before the days of optical drop counters, simple wire electrical conductivity devices were the only automated and economical solutions for pH titrations in the teaching laboratory. A drop from the buret would make contact with two bare wires positioned closely together, creating a conductive current path. An electronic circuit would then convert this current into a pulse that was counted. A student could then calculate volume based on the number of drops and the average drop size, determined in a separate experiment. The MeasureNet system automatically determines the average drop size in each titration.
The most common method of performing pH titrations is the manual method. The drawbacks to this method:
Time consuming, giving students time to perform few titrations in a lab period.
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Larger reagent volumes required, making titrations more expensive in terms of reagent usage and disposal.
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Requires repetition for students to master endpoint detection with reasonable precision.
The 22nd BCCE at Penn State University marks the 10th anniversary of MeasureNet Technology’s introduction of the Optical Drop Counter to the chemical education community. During this decade, the MeasureNet drop counter has become a star in chemistry labs around the country and the world, performing a variety of functions even its designers had never imagined. MeasureNet’s drop counter allows students to leap past the typical pH titration experiment and engage in other interesting and educational titration methods like thermometric, potentiometric, amperometric and colorimetric titrations.
MeasureNet Technology's introduction of the industry’s first Multi-Functional Optical Drop Counter technology in 2002 at the 17th BCCE at Western Washington University obviously caught the attention of the conference attendees and venders. The MeasureNet drop counter has emerged as the industry standard, copied by all its competitors, such as Vernier Software & Technology, Pasco Scientific and MicroLab Inc. MeasureNet is both flattered by this attention and inspired to do more to bring innovative technology into the teaching laboratory.
MeasureNet's ElectroJelly™ pH electrode has been designed with students and the chemistry teaching lab in mind. What is ElectroJelly™? It is a solid material with highly concentrated salt (most times it is KCl) that can effectively hold reference electrode electrolytes and prevent it from contamination by sample back-flow. The ElectroJelly™ filled (sealed) electrodes have a longer life and need less calibration than regular gel filled electrodes, saving time and money. Two other features unique to the MeasureNet pH probe are the SilverCap™ for noise reduction while handling the probe, and the epoxy body design uses holes instead of tabs too better protect the glass bulb from the rough handling of students. You use the pH probe with our Drop Counter for pH titrations.
ElectroJelly™ pH Electrode Features:
- Superior Stability
- Fast response
- Minimum sodium (alkaline) error
- pH 0 -14 full range measurement
- Special internal fill offers full range linear temperature compensation
- Very low sensor glass membrane resistance
- Zero and Isopotential: ~pH 7
- Unique Glass Bulb protection design
MeasureNet's ElectroJelly™ probes are ideal for undergraduate research projects. The probe's stability and long life span are ideal for 24/7 monitoring applications and experiments involving temperature cycling. If pH titrations are an fundamental part of your curriculum or research, the ElectroJelly™ probes stability and rapid response time makes it the perfect choice.