Bio-Rad Chelex® 100 Resin User Manual
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Introduction
Chelex chelating ion exchange resin has unusually
high preference for copper, iron, and other heavy met-
als over monovalent cations such as sodium and
potassium. Its selectivity for divalent over monovalent
ions is approximately 5,000 to 1, and it has a very
strong attraction for transition metals, even in highly
concentrated salt solution.
Technical Description
Chelating resin is available as Analytical Grade
Chelex 100 resin, Biotechnology Grade Chelex 100
resin, and Technical Grade Chelex 20 resin. The
Analytical Grade Chelex 100 resin has been exhaus-
tively sized, purified, and converted to make it suit-
able for accurate, reproducible analytical techniques.
Biotechnology Grade Chelex 100 resin is analytical
grade resin which is certified to contain less than 100
micro-organisms per gram of resin. Technical Grade
Chelex 20 resin is coarse mesh resin useful for large
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