Method and apparatus for quantitative analysis of weakly ionized anions or cations
US4242097A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 5, 1979 |
| Grant date | Dec 30, 1980 |
| Priority date | — |
| Expiry date | Mar 5, 1999 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T436/15
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Method and apparatus for quantitative analysis of weakly ionized anions (e.g. carboxylates) or cations (e.g., organic amines). For anion analysis, the sample and a strong acid (e.g., HCl) eluent are passed through an ion exclusion chromatography column (cation exchange resin) to resolve the weak anions while eluting the strong anions in the void volume peak. HCl is stripped on an ion exchange stripper column in the silver ion form and the effluent is directed through a conductivity cell and associated readout for detection. For weak cation analysis, the sample and a strong base (e.g., Ba(OH).sub.2) eluent are passed through an ion exclusion chromatography column (anion exchange resin) to resolve the weak cations while eluting the strong cations (e.g., Na.sup.+, K.sup.+) in the void volume peak. Ba(OH).sub.2 is stripped on an ion exchange stripper column in the sulfate ion form and the effluent is directed through a conductivity cell and associated readout for detection.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.