| 摘要 |
The invention relates to a method for the selective complexometric quantitative determination of N-(phosphonomethyl)glycine, N-(phosphonomethyl)-N-(carboxymethyl)glycine, N,N-bis(phosphonomethyl)glycine or a mixture of N-(phosphonomethyl)- N-(carboxymethyl)glycine and N,N-bis(phosphonomethyl)glycine or a mixture of N-(phosphonomethyl)glycine and N,N-bis(phosphonomethyl)- glycine, in which… a) a bismuth volumetric solution is used to determine the content of N-(phosphonomethyl)-N-(carboxymethyl)glycine or N,N-bis(phosphonomethyl)glycine at a pH of 1.5 to 2.5 in the presence of a methylthymol blue indicator and/or… b) a copper volumetric solution is used to determine the sum of the content of N-(phosphonomethyl)glycine and N-(phosphonomethyl)- N-(carboxymethyl)glycine or N-(phosphonomethyl)glycine and N,N-bis(phosphonomethyl)glycine at a pH of 8 to 10 in the presence of a murexide indicator, and the content of N-(phosphonomethyl)glycine in the sample is calculated from the results of the two determinations where appropriate. …<??>This method can be carried out simply, quickly and with little effort. |
