Ultra Low-Conductivity Water by Electrophoretic Ion Exclusion

Area of Science:

• Electrochemistry
• Materials Science
• Water Purification

Background:

• Achieving ultra-pure water is critical for various scientific and industrial applications.
• Existing purification methods face limitations in reaching extremely low ionic impurity levels.

Purpose of the Study:

• To develop a novel method for producing ultra-low conductivity water.
• To achieve electrical conductivity values below previously reported minima.

Main Methods:

• Recirculating water through an electric field (1,000 V/cm) between ion-selective membranes.
• Utilizing electrochemistry to remove ionic impurities.

Main Results:

• Consistently produced water with electrical conductivity below literature minima.
• Achieved a lowest conductivity of 0.039 × 10^-6 ohm^-1 cm^-1 at 18 °C.
• Reduced ionic impurity content to one-third of previously reported minimums, equivalent to 0.0010 ppm NaCl.

Conclusions:

• The developed method effectively produces ultra-low conductivity water.
• This technique offers a significant advancement in water purification for high-purity requirements.
• The achieved purity level opens possibilities for more sensitive scientific research and industrial processes.