Chromogenic cryptand reagents and methods for determining cation concentrations in test samples containing interfering cations
US4994395A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 15, 1987 |
| Grant date | Feb 19, 1991 |
| Priority date | — |
| Expiry date | Apr 15, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S436/805
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The invention is reagents and procedures for determining an amount of cations present in a sample, the reagent comprising PA1 (a) one or more chromogenic cryptand compounds of formula I ##STR1## wherein k and j, either same or different, are equal to 1 to about 5; PA1 m and n, either same or different, are equal to 0 to about 4; PA1 a and e, either same or different, are equal to 0 to about 2; PA1 b and d, either same or different, are equal to 0 to about 5; PA1 R, either same or different, is hydrogen, lower alkyl, lower alkylidene, lower alkenyl, allyl, or aryl; and PA1 --Q-- is ##STR2## wherein X is CH, N, or COH; and PA1 Y includes ##STR3## and (b) one or more interfering cation complexing compound masks.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.