Process for selective complexometric analysis of N-phosphorometh

Details Process for selective complexometric analysis of N-phosphorometh Process for selective complexometric analysis of N-phosphorometh

1990-04-11

1992-08-11

Warden, Robert J.

Chemistry: analytical and immunological testing

Phosphorus containing

Organic

436163, 436464, 71 86, G01N 3300

Patent

active

051378345

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.

REFERENCES:
patent: 3799758 (1974-03-01), Franz
patent: 4130412 (1978-12-01), Franz
patent: 4131448 (1978-12-01), Franz
patent: 4486359 (1984-12-01), Bredel nee Hajnoczki et al.

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