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Dibutyl phosphate (DBP) in tributyl phosphate (TBP) was determined by 31P FT-NMR. Adoption of gated 1H decoupling and pyridine as a solvent provided good peak separation. With a 120-s pulse waiting time to achieve sufficient relaxation of the system, dibutyl phosphate contents could be determined directly from peak-area ratios with a 2% error for 20 accumulation times (1DBP/TBP0.05) or a 10% error for 1000 accumulation times (0.05>DBP/TBP8×10–4).
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Naohito Uetake (1987) studied this question.
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