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Determination of the Effective Content in Glufosinate TC by Phosphorus-31 Nuclear Magnetic Resonance (~(31)P-NMR) Spectroscopy

LU Ai-min;CHEN Min;XU Jiang-yan;YANG Chun-long;College of Science, Nanjing Agricultural University;  
[Aims] A rapid and quantitative method for determination of the effective content of glufosinate TC by Phosphorus-31 Nuclear Magnetic Resonance(~(31)P-NMR) Spectroscopy was established. [Methods] The D_2O was used as solvent and potassium dihydrogen phosphate(KH_2PO_4) was selected as internal standard. The relaxation time of potassium dihydrogen phosphate and glufosinate which determined by t1 irpg pulse sequence was used to set the delay time D1. The ~(31)P-NMR spectra of glufosinate mixed with potassium dihydrogen phosphate was obtained with zgig pulse sequence at 296 K. The integration of signals at δ 0.017 and 41.86 were used for quantification, and the effective content of glufosinate can calculated according to the formula. [Results] Linear regression of quantitative peak integrations ratio(I_(std)/I_x) versus mass ratio(m_(std)/m_x) of KH_2PO_4 to glufosinate yielded a correlation coefficient of 0.9999.The average effective content of glufosinate TC was 98.73%, and the RSD was 0.18%. [Conclusions] The method of quantitative nuclear magnetic resonance was simple and rapid, which can analyze special samples quantitatively and qualitatively without standard substance.
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