Quick measuring method of bivalent copper ion in copper plating bath

Abstract

The invention belongs to the field of metal ion detection, and relates to a quick measuring method of a bivalent copper ion in a copper plating bath. The method comprises the following steps that PANis adopted as an indicator, a test solution is adjusted to be weakly acidic through a buffer solution, an EDTA standard solution is titrated to the solution until the solution is yellow and green, andthe total content of Cu<2+> and Fe<2+> is calculated according to the volume and concentration of the consumed EDTA standard solution; a sample with the same volume is taken, diphenylaminesulfonic acid sodium salt is adopted as an indicator, a K2Cr2O7 standard solution is titrated to the solution in a strong acid environment until the solution is purple, Fe<2+> are fully oxidized to Fe<3+> by K2Cr2O7, excessive K2Cr2O7 reacts with the diphenylaminesulfonic acid sodium salt, the solution is purple, namely, the equivalence point of the reaction is reached, and according to the volume and concentration of the consumed K2Cr2O7 standard solution, the content of Fe<2+> is calculated; and the content of Cu<2+> can be obtained by subtracting the content of Fe<2+> from the total content of Cu<2+>and Fe<2+>.

Description

technical field [0001] The invention belongs to the field of metal ion detection and relates to a method for rapidly measuring divalent copper ions in a copper plating solution. Background technique [0002] Copper plating of welding wire is in acidic environment, CuSO in steel wire and tank pool 4 A replacement reaction is carried out to form a thin copper layer on the surface of the steel wire to protect the steel base from corrosion. The main reactions are as follows: [0003] CuSO 4 +Fe=FeSO 4 +CuH 2 SO 4 +Fe=FeSO 4 +H 2 CuSO 4 +H 2 =H 2 SO 4 +Cu [0004] It can be seen that the main component of the solution is H 2 SO 4 , FeSO 4 、CuSO 4 , FeSO 4 The presence of can induce the reaction to proceed to the right, H 2 SO 4 The main function is catalysis, while keeping the solution acidic, preventing Fe 2+ Oxidized. [0005] CuSO 4 As an important auxiliary material, CuSO 4 ·5H 2 O is added in the form of O, and the concentration is required to be cont...

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Problems solved by technology

Although the instrument detection has better selectivity and faster speed, the pretreatment of the sample is relatively cumbersome, and the instrument is expensive, so it is difficult to achieve the practicality and cost performance of the test, so it is not considered

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