Getting The Best Results From Ultrapure Water
•Article: Getting The Best Results From Ultrapure Water
By Dr. Paul Whitehead, CChem, FRSC Laboratory Manager, ELGA R&D Facility
Type 1 ultrapure water is by far the purest substance used in a laboratory. This article discusses the high level of purity of ultrapure water, the importance of such purity and how to maintain this standard during normal laboratory use.Introduction
In today's laboratories the availability of pure water for research and testing applications is essential. Elements and compounds present in the parts per billion (ppb) range or lower could negatively affect applications by interacting with samples, active media or system components.
One hundred percent pure water consists solely of water molecules in equilibrium with hydroxyl and hydrogen ions (10-7M at 25°C). This composition gives a characteristic electrical resistivity of 18.2 Mohm.cm. However, the unique ability of water to dissolve virtually every chemical compound to some extent and to support practically every form of life means that its purity is constantly under threat from five types of impurities. These are suspended particles; inorganic compounds; organic molecules; dissolved gases; and microorganisms including their associated biomolecules. To generate high purity water for laboratory use, mains drinking water is put through a series of purification steps to remove these different types of impurities.
Click Here To Download:•Article: Getting The Best Results From Ultrapure Water