D890 (Cl form) resin is highly nitrate selective due to its unique functional group. In fact, it has higher affinity for monovalent anions (e.g., nitrate) than for di– or tri-valent anions. This is the opposite of the standard Type I and Type II anion resins such as A307 and A302.
In many water treatment applications, D890 is less selective for sulfate than nitrate and nitrate dumping is eliminated. Certain chemical and
wastewater treatment processes require a high capacity for monovalent anions than for divalent or trivalent anions.
Because of its unique nature, D890 reverses the electro-selectivity of standard anion resins, and offers preferential removal of anions of lower
valence. Particularly, the product can be highly effective in the removal of nitrate in water and wastewater treatment applications even with
the presence of high sulfates.