Potentiometric titration method for measuring concentration of acid mixture of aluminum etchant
US8945934B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 23, 2012 |
| Grant date | Feb 3, 2015 |
| Priority date | — |
| Expiry date | Jan 2, 2033 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T436/15
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The present invention provides a potentiometric titration method for measuring concentration of acid mixture of aluminum etchant, which prepares identified potassium hydroxide-ethanol solution or sodium hydroxide-ethanol solution as a titrant and uses a monohydric alcohol and a diol as an anhydrous medium for the acid mixture of aluminum etchant to carry out titration of the acid mixture of aluminum etchant so as to realize measurement of concentration of each acid contained in the acid mixture of aluminum etchant through a one-stage process of potentiometric titration thereby reducing the complication of operation of inspection and uncertainty of inspection result and achieving the purposes of carrying out inspections with high precision and high performance. The method can efficiently and accurately measure the concentrations of nitric acid, phosphoric acid, and acetic acid contained in the acid mixture of aluminum etchant.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.