| 摘要 |
PURPOSE: To reduce the elution amt. of TOC from a boron selective ion exchange resin used in a state incorporated in a pure water or ultrapure water making apparatus. CONSTITUTION: Pure water or ultrapure water being water to be treated is brought into contact with a boron selective ion exchange resin wherein a weak basic exchange group is prepared in a free base form and a strong basic exchange group is prepared in a salt form to remove boron ions in water to be treated. |
