PURPOSE: To obtain the concentration of the additive in plating liquid by measuring the electrochemical characteristic value on an electrode by dipping the metallic electrode after a material for removing formaldehyde in electroless copper plating liquid is added into the electroless copper plating liquid. ;CONSTITUTION: Formaldehyde in electroless copper plating liquid is removed. The electrochemical characteristic value on a metallic electrode is measured under the state wherein the plating reaction of the electroless copper plating liquid does not occur and the effect of the formaldehyde itself is removed. Thus, the behavior of additive is adequately obtained. As the material for removing the formaldehyde in the electroless copper plating liquid, one or more kinds of sodium sulfite, sodium hydrogensulfite, hydrogen peroxide and iodine can be used. As the electrode, gold, platinum and palladium are suitable. As the configurations, the substances in the shapes of a plate (box), and a disk (rotary electrode) are suitable. It is preferable that the electrochemical characteristic value as the index of the additive concentration is measured by a potential- current curve method and the like.;COPYRIGHT: (C)1995,JPO
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