Department of Chemistry, Faculty of Natural & Agricultural Sciences, University of Pretoria,, Pretoria, South Africa.
Luminescence. 2019 Aug;34(5):480-488. doi: 10.1002/bio.3620. Epub 2019 Mar 4.
Atrazine is a common agricultural pesticide which has been reported to occur widely in surface drinking water, making it an environmental pollutant of concern. In the quest for developing sensitive detection methods for pesticides, the use of quantum dots (QDs) as sensitive fluorescence probes has gained momentum in recent years. QDs have attractive and unique optical properties whilst coupling of QDs to molecularly imprinted polymers (MIPs) has been shown to offer excellent selectivity. Thus, the development of QD@MIPs based fluorescence sensors could provide an alternative for monitoring herbicides like atrazine in water. In this work, highly fluorescent CdSeTe/ZnS QDs were fabricated using the conventional organometallic synthesis approach and were then encapsulated with MIPs. The CdSeTe/ZnS@MIP sensor was characterized and applied for selective detection of atrazine. The sensor showed a fast response time (5 min) upon interaction with atrazine and the fluorescence intensity was linearly quenched within the 2-20 mol L atrazine range. The detection limit of 0.80 × 10 mol L is comparable to reported environmental levels. Lastly, the sensor was applied in real water samples and showed satisfactory recoveries (92-118%) in spiked samples, hence it is a promising candidate for use in water monitoring.
莠去津是一种常见的农业农药，据报道广泛存在于地表水饮用水中，因此成为一种令人关注的环境污染物。在寻求开发用于检测农药的灵敏方法方面，近年来，量子点（QD）作为灵敏荧光探针的使用已取得了进展。QD 具有有吸引力和独特的光学特性，而将 QD 与分子印迹聚合物（MIP）结合已被证明具有优异的选择性。因此，基于 QD@MIP 的荧光传感器的发展可以为监测水中莠去津等除草剂提供一种替代方法。在这项工作中，使用传统的有机金属合成方法制备了高荧光 CdSeTe/ZnS QD，并将其封装在 MIP 中。对 CdSeTe/ZnS@MIP 传感器进行了表征，并将其用于选择性检测莠去津。该传感器与莠去津相互作用时表现出快速的响应时间（5 分钟），并且在 2-20 mol L 的莠去津范围内荧光强度呈线性猝灭。检测限为 0.80×10 -6 mol L，与报道的环境水平相当。最后，该传感器被应用于实际水样中，并在加标样品中表现出令人满意的回收率（92-118%），因此它是一种有前途的水监测候选物。
