Coordination titration is used with mercury membrane electrode and wolfram one as u orking and reference electrodes respec-tively.Standard soln.consists of EDTA,zinc acetate and magnesium sulfate.

• 采用汞膜电极、钨电极下的配位滴定法，以EDTA、醋酸锌、硫酸镁为标准溶液，连续测定镀铜液中的焦磷酸盐及正磷酸盐的含量。