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研究了在水相中合成了高质量的巯基乙酸包被的CdTe,通过1-(3-二甲氨基丙基)-3-乙基碳二亚胺(EDC)连接了壳聚糖。在pH6.4的PBS缓冲溶液中十六烷基三甲基溴化铵(CTMAB)存在下,汞离子对壳聚糖包覆的CdTe量子点具有荧光猝灭作用,实现了对水溶液中汞的定量检测。在最优条件下,壳聚糖包覆的量子点荧光猝灭与汞呈良好的线性关系,线性范围为0.3—15.0μg/L,检出限为9.5×10-8g/L。对5.0μg/L Hg2+平行测定11次,相对标准偏差为4.8%。该法用于水样品测定,相对标准偏差在5.0%以下,回收率为95.7%—102.6%,并且与ICP-AES相比,结果基本一致。该法用于实际样品测定误差较小,精密度与准确度均令人满意。
We studied the synthesis of thioglycolic acid-coated CdTe in the aqueous phase and the attachment of chitosan via 1- (3-dimethylaminopropyl) -3-ethylcarbodiimide (EDC). In the presence of cetyltrimethylammonium bromide (CTMAB) in pH6.4 PBS buffer solution, mercury ions have a fluorescence quenching effect on the chitosan-coated CdTe quantum dots, Quantitative detection. Under optimal conditions, fluorescence quenching of chitosan-coated quantum dots showed a good linear relationship with mercury, with a linear range of 0.3-15.0μg / L and a detection limit of 9.5 × 10-8g / L. The determination of 5.0μg / L Hg2 + in parallel 11 times, the relative standard deviation of 4.8%. The method was applied to the determination of water samples. The relative standard deviation was less than 5.0% and the recovery was 95.7% -102.6%. The results were basically the same as ICP-AES. The method for the actual sample less error, precision and accuracy are satisfactory.