| 摘要 |
PROBLEM TO BE SOLVED: To obtain a water treatment agent in which a nitrite used for preventing the corrosion of metals in a water system is used as the main agent. SOLUTION: This water treatment agent contains the nitrite and an isothiazolon compound expressed by formula (1); wherein, Y is hydrogen atom, an alkyl group, an alkenyl group, an alkynyl group or an aralkyl group, and R is hydrogen atom.
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