Process for selective complexometric analysis of N-phosphoromethyl-glycine, N-carboxymethyl-N-phosphonomethyl-glycine and N,N-bisphosphono-methyl-glycine
US5137834A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 11, 1990 |
| Grant date | Aug 11, 1992 |
| Priority date | — |
| Expiry date | Apr 11, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T436/163333
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A process is provided for the quantitative selective complexometric analysis of a sample. First and second aliquot parts of a sample containing N-phosphonomethyl-glycine, N-carboxymethyl-N-phosphonomethyl-glycine or N,N-bis-phosphonomethyl-glycine; or N-phosphonomethyl-glycine and N,N-bis-phosphonomethyl-glycine; or N-phosphonomethyl-glycine and N-carboxymethyl-N-phosphonomethyl-glycine are taken. The first aliquot part is titrated with a bismuth volumetric solution at a Ph=1.8-2.5 in the presence of a methylethymol blue indicator. The second aliquot part is titrated with a copper volumetric solution at a Ph=8-10 in the presence of a murexide indicator. Two end point values are obtained and compared. The difference between these two values result in the determination of the content of N-phosphonomethyl-glycine in the sample.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.