التفاصيل البيبلوغرافية
| العنوان: |
Rapid and environmentally friendly determination of trace nitrite in water under combined effects of cetyltrimethyl ammonium bromide and β-cyclodextrin. |
| المؤلفون: |
Gui-Ping Cao, Fu-Hua Jiang, Ya-Feng Zhuang |
| المصدر: |
Desalination & Water Treatment; Nov2019, Vol. 169, p259-267, 9p |
| مصطلحات موضوعية: |
CETYLTRIMETHYLAMMONIUM bromide, NITRITES, FLUORESCENCE quenching |
| مستخلص: |
Nitrite is a characteristic pollutant in natural water. A simple, rapid and highly selective spectrofluorimetric method for determination of trace nitrite has been developed. It was based on the fact that nitrite reacted rapidly with iodide at room temperature and led to the fluorescence quenching of 4',5'-dibromofluorescein (DBF) under the combined effects of cetyltrimethyl ammonium bromide (CTAB) and ß-cyclodextrin (ß-CD). The fluorescence intensity of the above reaction system was measured with excitation and emission wavelengths of 532 and 551 nm, respectively. Optimal values of the main factors involving volumes of CTAB, ß-CD and sulfuric acid were explored by a Box-Behnken design. Under the optimized experimental conditions, the fluorescence quenching intensity was good linear over a nitrite concentration range of 0.2-46.0 µg/L with a correlation coefficient better than 0.998. The detection limit of 0.16 µg/L was obtained for the determination of nitrite by the proposed method. The general coexisting ions did not interfere to the reactions of nitrite with iodide and DBF. The relative standard deviation of the method for the determination of nitrite in water samples was below 2.7%, and the corresponding recoveries were between 92.1% and 107.9%. The proposed method is environmentally friendly and suitable for water monitoring. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
Complementary Index |
