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Study of fluorescence detection of sodium ion and three azoles fungicides for the Schiff base compounds -Zn

Author: HuaXia
Tutor: LuRong
School: Northwestern University
Course: Of Food Science
Keywords: Schiff base-zinc alkali metal ions riazole fungicides fluorescence detection
CLC: TQ455.4
Type: Master's thesis
Year: 2012
Downloads: 40
Quote: 0
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Abstract


Triazole fungicides is a new type of broad-spectrum, low toxicity of the systemic fungicide. It is widely used and become a new threaten to our health if there are residues remain in food. Alkali metal ions are widespread in nature, they will influences the process both in food production and the food testing more or less. Fluorescence detection with high sensitivity and selectivity characteristics, but there is little literature the use of fluorescence detection method for detection of triazole fungicides and the alkali metal ions. We synthesized three kinds of Schiff base-Zn compounds:ZnL1, ZnL2, and ZnL3, and observed the changes of ZnL1, ZnL2, and ZnL3when their solution were add with tricyclazole, Penconazole and8kinds Alkali metal ions separately by ultraviolet spectrum and fluorescence spectrum. And we see if ZnL1, ZnL2, and ZnL3have any molecular recognition ability to tricyclazole, Penconazole and Alkali metal ions.1. The synthesis of three different Schiff base ligands H2L1, H2L2and H2L3and their zinc complexes ZnL1, ZnL2and ZnL3. Their optical properties were characterized by UV spectrum and fluorescence spectrum; Their molecular structure properties were characterized by EA and1H NMR spectra.2. We proceed the ultraviolet photometric titration and fluorescence titration of ZnL2add with a variety of alkali metal ions (Li+, Na+, K+, Cs+, Mg2+, Ca2+, Sr2+, Ba2+) separately; and observed the changes of ultraviolet spectrum and fluorescence spectrum, analysed the different influences in all these alkali metal ions. The results show that Na+have the strong quenching effect to ZnL2solution, but the other alkali metal ions didn’t show obvious quenching effect to ZnL2solution. Fluorescence intensity of the solution I and the concentration of Na ion concentration[Q], They had good linear relationship in the very dilute solution. So the quantitative analysis could be proceed by fluorescence detection method.3. Prepared ZnL2-Na single crystal and analysis its structure by X-Ray, used to describe the mechanism of Na+quenching the solution of ZnL2.4. Analysised the optical properties of tricyclazole and Penconazole by UV spectrum and fluorescence spectrum, and study the influence of different solvents on the spectrum of tricyclazole and Penconazole. The results show that if the solvent polarity is smaller, the peak of tricyclazole and Penconazole’s UV absorption and fluorescence excitation and emission will redshift in some extent, while the fluorescence intensity will be reduced too.5. We proceed the ultraviolet photometric titration and fluorescence titration of ZnL1, ZnL2, ZnL3add with tricyclazole or Penconazole separately. The results show that add with tricyclazole in the acetonitrile solution of ZnL1, ZnL2didn’t cause significant changes in the solution spectrum, as well as the Penconazole. The enhancement in the220nm of the UV spectrum is due to the synergistic effect of two different compounds. When the dichloromethane solution of ZnLj add with tricyclazole or Penconazole will significant changes the ultraviolet spectrum and fluorescence spectrum. The peak of fluorescence spectrum of excitation and emission (λex=415nm, λem=535nm) profiles have increased, the peak position has not changed.

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CLC: > Industrial Technology > Chemical Industry > Pesticide Industry > Antiseptic > Organic fungicides
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