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- W2040387345 abstract "A precise and sensitive method is described for the determination of N-nitrosodiethanolamine (NDELA) at the 1 μg l−1 level. NDELA was found to be extracted from aqueous solution by ethyl acetate at pH 1.0. The technique is based on the alkaline denitrosation of NDELA and reaction of the nitrite liberated with Coumarin 120 (4-methyl-7-aminocoumarin) in sulphuric acid medium to give the corresponding 7-diazo compound. After hydrolysis at 100°C, the corresponding 7-hydroxycoumarin (4-methylumbelliferone) is detected fluorimetrically at 380 nm after excitation at 325 nm. HPLC is essential to separate excess Coumarin 120 from 4-methylumbelliferone. Linearity was obtained from 1 to 30 μg l−1 (r = 0.997). The limit of detection was 0.8 μg l−1 for a signal-to-noise ratio of 3. The repeatability expressed as R.S.D. was 6.8% at 1 μg l−1 and 5.5% at 30 μg l−1. The reproductibility, established by two operators on three consecutive days at 5 μg l−1 (n = 6), was 9.2% (R.S.D.). Under the conditions adopted, detection of trace levels of NDELA in ethanolamine derivatives is possible." @default.
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- W2040387345 title "Determination of N-nitrosodiethanolamine as nitrite in ethanolamine derivative raw materials by high-performance liquid chromatography with fluorescence detection after alkaline denitrosation" @default.
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- W2040387345 doi "https://doi.org/10.1016/0021-9673(95)00853-5" @default.
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