CAJ | 학술논문

目的：建立水环境中微量汞离子的定量检测方法。方法通过层层自组装法将表面带有负电荷的CdTe量子点与聚电解质PDDA交替沉积在石英板上，成功制备出双色量子点多层膜。在该方法中Hg2+对CdTe量子点有荧光猝灭作用，据此发展了一种直接检测Hg2+的新型双色CdTe量子点多层膜传感器。结果实验结果表明：当Hg2+浓度在1.0×10-9～1.0×10-5 mol/L范围时，量子点多层膜的荧光强度与Hg2+浓度之间有良好的线性关系，检出限为2.5×10-10 mol/L。结论与传统 Hg2+检测方法相比，双色 CdTe荧光量子点多层膜作为一种新型传感器，具有快速、简单、选择性高和灵敏度高等优点，有望应用于水环境中痕量Hg2+的定量检测与早期预警。
목적：건립수배경중미량홍리자적정량검측방법。방법통과층층자조장법장표면대유부전하적CdTe양자점여취전해질PDDA교체침적재석영판상，성공제비출쌍색양자점다층막。재해방법중Hg2+대CdTe양자점유형광졸멸작용，거차발전료일충직접검측Hg2+적신형쌍색CdTe양자점다층막전감기。결과실험결과표명：당Hg2+농도재1.0×10-9～1.0×10-5 mol/L범위시，양자점다층막적형광강도여Hg2+농도지간유량호적선성관계，검출한위2.5×10-10 mol/L。결론여전통 Hg2+검측방법상비，쌍색 CdTe형광양자점다층막작위일충신형전감기，구유쾌속、간단、선택성고화령민도고등우점，유망응용우수배경중흔량Hg2+적정량검측여조기예경。
Objective To establish a method for determination of mercury ions in water environment. Methods The functional multilayer films were assembled by layer-by-layer (LbL) deposition of oppositely charged CdTe quantum dot (QDs) and poly (dimethyldiallylemmonium chloride) (PDDA). The bi-color quan-tum dot multilayer films were used as fluoresce probes for the quantitative determination of trace amounts of Hg2+ based on the evident quenching action of Hg2+ on the fluorescence of CdTe QDs.Results Experimental results showed that the quenching in fluorescence intensity of multilayer films was linearly proportional to the concentration of Hg2+ in the range of 1.0×10?9to 1.0×10?5 mol/L and the detection limit was 2.5×10-10 mol/L. Conclusion Compared with the traditional Hg2+ detection method, this method has the advantages of simpli-fication, rapidness, high selectivity and high sensitivity. Furthermore, the proposed method was applied to the determination of trace Hg2+ in water samples with satisfactory results.