Evaluating a cleaning solution using UV absorbance
US8138482B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 23, 2008 |
| Grant date | Mar 20, 2012 |
| Priority date | — |
| Expiry date | Apr 24, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/33
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A process for evaluating a cleaning solution is described. The process includes: (i) subjecting a solution, including a solute and a solvent, to sonic energy to create a sonicated solution; (ii) measuring UV absorption of the sonicated solution to produce a sample UV absorbance spectra; (iii) obtaining a reference solution, which includes a solute concentration that is similar to that of solute concentration in the sonicated solution; (iv) measuring UV absorption of the reference solution to produce a reference UV absorbance spectra; (v) scaling the reference UV absorbance spectra to the sample UV absorbance spectra at a lower range of the UV spectrum; (vi) subtracting from the reference UV absorbance spectra the sample UV absorbance spectra to produce a differential UV spectra; and (vii) evaluating at or near a peak of the sample UV absorbance spectra the differential UV absorbance spectra to determine whether the sonicated solution is activated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.