| 摘要 |
In a process for maintaining a given zinc content in nickel-containing zinc phosphate baths, (a) nickel is precipitated in a bath sample by addition of dimethylglyoxime, a soluble copper complex compound is added and the liquid is then titrated against a copper-sensitive electrode, for determining the zinc content, with a volumetric solution containing a complexing agent for zinc and copper; (b) the automatic metering of zinc-containing supplementary concentrate is then regulated on the basis of the deviation, ascertained in this way, from the given zinc content (prescribed value).
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