科研之友
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摘要
B is a necessary trace element for human and animals, but the excess intake of B caused poison. Thus, it is very important to determination of B in foods and water. The target of this study is development of a new, sensitive and selective resonance Rayleigh scattering energy transfer (RRS-ET) for the determination of B. The combination of energy transfer with resonance Rayleigh scattering (RRS) has developed a new technology called RRS-ET, which can realize selective and sensitive detection of boric acid. The gold nanorods in diameter of 12 nm and length of 37 nm were prepared by the seed growth procedure. In pH 5. 6 NH4Ac-HAc buffer solution and in the presence of azomethine-H (AMH), the gold nanorod particles exhibited a strong resonance Rayleigh scattering (RRS) peak at 404 nm. In the presence of boric acid, it reacts with AMH to form AMH-boric acid (AMH-B) complexes. When the complexe as a receptor close to the gold nanorod as a donor, the resonance Rayleigh scattering energy transfer (RRS-ET) take placed that resulted in the Rayleigh scattering signal quenching. With the increase of the concentration of boric acid, the formed complexes increased, the scattering light energy of gold nanorod transfer to the complexes increased, resulting in the Rayleigh scattering intensity linearly reduced at 404 nm. The decreased RRS intensity responds linearly to the concentration of boron over 10 similar to 750 ng . mL(-1) B, with a regress equation of Delta I-404 (nm) = 3. 53c+24 and a detection of 5 ng . mL(-1) B. The influence of coexistence substances on the RRS-ET determination of 2. 3X10(-7) mol . L-1 B was considered in details. Results showed that this new RRS-ET method is of high selectivity, that is, 4x10(-4) mol . L-1 Mn2+, Cd2+, Zn2+, Bi3+, Na+, Al3+, glucose, Hg2+, IO3-, F-, SO42-, SiO32-, NO3-, ClO4-, H2O2, mannitol, glycerol, and ethylene glycol, 4X10(-5) mol . L-1 L-tyrosine, and 2X10(-4) mol . L-1 L-glutamic acid do not interfere with the determination. Based on this, a new sensitive, selective, simple and rapid RRS-ET method has been developed for the determination of trace boron in six mineral water samples that contain 24. 9, 29. 3, 57. 9, 59. 0, 84. 9, and 105. 1 ng . mL(-1) B, with relative standard deviation of 1. 6%similar to 4.1% and recovery of 95. 6%similar to 109. 6%.
