Process for selective complexometric analysis of N-phosphoromethyl-glycine, N-carboxymethyl-N-phosphonomethyl-glycine and N,N-bisphosphono-methyl-glycine
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United States of America Patent
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Aug 11, 1992
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N/A
app pub date -
Apr 11, 1990
filing date -
Apr 11, 1989
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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.
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