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粉末表层的金属钴在稀酸溶液中迅速溶解,以硝酸钴形式进入液相。基体碳化钨由于化学惰性在短时间内不被稀酸溶解,从而达到选择性溶解钴,液相用电位滴定法测定钴的目的。
The metallic cobalt on the powder surface rapidly dissolves in dilute acid solution and enters the liquid phase in the form of cobalt nitrate. The matrix tungsten carbide is not dissolved by dilute acid in a short time due to its chemical inertness, thus achieving the selective dissolution of cobalt and the determination of cobalt by liquid-phase potentiometric titration.