CheapStat: An Open-Source, “Do-It-Yourself” Potentiostat for Analytical and Educational Applications
Figure 5
Analysis of the arsenic content in three acidified lake water solutions.
Samples were collected from Lake Cachuma (Santa Barbara, CA) and mixed in an 11∶1 ratio with concentrated HCl. An arsenate standard was spiked into two of the samples (top 20 ppb, middle 5 ppb), and one was left as a blank (bottom). The dissolved arsenate in each solution was reduced at −0.5 V and then analyzed by square wave voltammetry at 40 Hz.