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以氯化锰、氯化锌、硫化钠为原料,在油酸-无水乙醇混合溶剂中,180℃条件下,反应8h,成功制备了ZnS∶Mn量子点。320nm激发条件下,ZnS∶Mn量子点的荧光发射峰位于420nm。且苏丹Ⅰ在350~540nm范围内有较好的吸收,利用苏丹Ⅰ对ZnS∶Mn量子点荧光强度的猝灭建立荧光探针体系,当苏丹Ⅰ浓度在5.0×10-8~7.0×10-7 mol/L内,线性方程为ΔF=389.29-25.12c,相关系数(R)为0.9915(n=5),检测限为1.46×10-8 mol/L。且成功用于实际样品中苏丹Ⅰ的检测,加标回收率在92.8%~99.2%之间。
The ZnS: Mn quantum dots were prepared successfully by using manganese chloride, zinc chloride and sodium sulfide as raw materials in a mixed solvent of oleic acid and ethanol at 180 ℃ for 8h. Under the excitation of 320nm, the fluorescence emission peak of ZnS: Mn quantum dot is at 420nm. And the Sudan Ⅰ has a good absorption in the range of 350-540 nm. The Sudan Ⅰ quenching fluorescence intensity of ZnS: Mn quantum dots was used to establish the fluorescence probe system. When the concentration of Sudan Ⅰ was 5.0 × 10-8 ~ 7.0 × 10- The linear equation was ΔF = 389.29-25.12c and the correlation coefficient (R) was 0.9915 (n = 5). The detection limit was 1.46 × 10-8 mol / L. And successfully used in the actual sample Sudan Ⅰ detection, the spike recovery between 92.8% to 99.2%.