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12
2025
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11
Determination of ferric iron content in etching solution by fully automated potentiometric titration method
I. Introduction
Etching solutions are liquids that carve materials by eroding them. Currently, there are six main types of etching solutions in use: acidic copper chloride, alkaline copper chloride, ferric chloride, ammonium persulfate, sulfuric acid/chromic acid, and sulfuric acid/hydrogen peroxide etching solutions. The etching rate of ferric chloride etching solutions is mainly affected by etching temperature, hydrochloric acid content, and iron ion content. The Fe content in the etching solution primarily affects the etching rate; as the concentration gradually increases, the etching rate for copper increases accordingly. However, when the Fe content exceeds a certain concentration, the etching rate decreases due to increased solution viscosity. This experiment used a JH-T6 fully automatic potentiometric titrator from Shanghai Jiahang to determine the endpoint based on the potential jump point, measured the trivalent iron content, and verified the feasibility of the experimental scheme.
II. Instruments and Reagents
2.1 Instruments
JH-T6 fully automatic potentiometric titrator, composite platinum electrode, analytical balance, etc.
2.2 Reagents
Potassium iodide, hydrochloric acid (1+3) solution, 0.1 mol/L sodium thiosulfate standard titrant
III. Experimental Methods
3.1 Experimental Procedure:
Accurately weigh 0.5 g (accurate to 0.0001 g) of the sample to be tested into a titration vessel. Add 30 mL of deionized water, 3 g of potassium iodide, and 20 mL of (1+3) hydrochloric acid solution sequentially. Shake well, seal the vessel, and place it in the dark for 30 min. After standing, place the titration vessel on the titration stage, turn on the stirrer, and titrate with a known concentration of c=0.1017 mol/L sodium thiosulfate standard titrant until the potential jump endpoint. Record the titration volume. Repeat 3 sets, and simultaneously perform a blank experiment under the same conditions.
3.2 Instrument Parameters
Instrument parameters are shown in Table 1:
Table 1 Titrator Parameter Settings
IV. Results and Discussion
4.1 Experimental Results
The samples were tested, and the experimental results are shown in Table 2:
Table 2 Content Test Results
4.2 Titration Spectrum
4.3 Conclusion
This test used a fully automated potentiometric titration method to determine the content of ferric iron in the etching solution. Instrumental judgment reduced human error and greatly improved the accuracy of the experiment. Therefore, potentiometric titration is a good choice for detecting this type of sample.
Keyword:
automated potentiometric titration
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