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Square wave anodic stripping voltammetry and metal testing

electrochemistry lead potentiostat rodeostat

Square wave anodic stripping voltammetry and metal testing

The Rodeostat python library has several electrochemistry programs currently implemented including cyclic voltammetry, constant voltage, linear sweep, chronoamperometry and more. We have recently added a square wave anodic stripping voltammetry (SWASV) program to the library. Stripping voltammetry is a powerful electroanalytical technique for the detection of trace metals in the ppb range (more about this below). In this blog post we use SWASV with the Rodeostat potentiostat to measure lead using a commercial bismuth screen printed electrode. Bismuth has gained alot of attention as a suitable non-toxic replacement for mercury electrodes (hanging-drop or thin film electrodes). Bismuth can form alloys with many metals. Lead, zinc and...

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Electrophoresis power supply - LCD display

Electrophoresis power supply - LCD display

We have recently updated the electrophoresis power supply to include an LCD display as shown in the images below. The price of the power supply kits remains the same ($65 for a kit). We also have a fully assembled and ready-to-use power supply option for $109 here. The online documentation has been updated for the new LCD display version.   Images of the updated electrophoresis power supply inside the acrylic enclosure  

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Making a custom electrochemical cell

potentiostat rodeostat

Making a custom electrochemical cell

In this blog post we describe making a simple custom electrode mount that we used in cyclic voltammetry experiments with the Rodeostat potentiostat. The electrodes we used were purchased from CH Instruments but the custom mount could be easily modified for use with other electrodes.  Designing a custom electrode mount for the electrodes For the set-up we decided to use a standard 100 mL glass beaker that we had available. The 100 mL beaker has an inner diameter of approx. 1.90". The next step was to make a custom mount for the 3 electrodes. Ag/AgCl2 reference electrode, Part # CHI111, $26  Platinum wire counter electrode, Part...

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Chronoamperometry with glucose test strips

Chronoamperometry with glucose test strips

In this electrochemistry experiment we used the Rodeostat potentiostat to measure glucose in liquids using commonly available glucose test strips. Glucose test strips are a type of biosensor - they convert biochemical reactions to an electrochemical signal. Each glucose test strip contains the enzyme glucose oxidase (GOx) and an electron transfer mediator. On the surface of the test strip, glucose oxidase converts glucose to gluconic acid and hydrogen peroxide, transferring two electrons to the flavin (FAD) group in glucose oxidase which is temporarily reduced (FADH2). Enzymes do not readily exchange electrons directly with an electrode, so a mediator is required to shuttle electrons from FADH2...

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Cyclic voltammetry with the Rodeostat

electrochemistry potentiostat rodeostat

Cyclic voltammetry with the Rodeostat

In a previous blog post we explored the irreversible redox reaction of ascorbate using the Rodeostat potentiostat. In this blog post we carried out a cyclic voltammetry experiment with ruthenium hexamine Ru(NH3)6 a reversible redox couple.  An example voltammogram of this redox couple is demonstrated in the Pine electrode literature and we have previously described this experiment using the Cheapstat potentiostat. Here we have repeated this cyclic voltammetry experiment using the Rodeostat potentiostat. A Pine screen printed carbon electrode was also used.  Equipment Rodeostat with screen printed adapter (ver A) Pine screen printed carbon electrode Micropipettes Microcentrifuge tubes Reagents 1) 0.1M KCl  To prepare 500 mL...

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