Method and composition for magnesium ion detection using hydroxy-substituted cyanoformazans
US5215925A · kind A · utility
3Cited by
4References
9Claims
0Family size
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Key dates
| Filing date | Jun 17, 1991 |
| Grant date | Jun 1, 1993 |
| Priority date | — |
| Expiry date | Jun 17, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N33/84
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
1,5-Bis(2-hydroxyphenyl)-3-cyanoformazans substituted in at least one of the 3-, 4- and 5-positions of either phenyl moiety are useful for the determination of magnesium ions. The cyanoformazan substituents are chosen such that their cumulative Hammett-sigma value is greater than about 0.23. These cyanoformazans are useful in analytical compositions and methods for either wet or dry assay of magnesium ions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.