Environmental Materials Division, CSIR-National Environmental Engineering Research Institute, Nehru Marg, Nagpur, 440020, India.
School of Chemistry, The University of Melbourne, Parkville, VIC, 3010, Australia.
Sci Rep. 2021 Aug 27;11(1):17321. doi: 10.1038/s41598-021-96968-3.
A complex of reduced graphene oxide (rGO) and fluorescein (FL) dye nanoparticles of size between 50 and 100 nm has been prepared and its sensing performance for detection of As(III) in drinking water has been reported. When As(III) binds to the rGO-FL nanoparticles the relative quenching of fluorescence was increased with increase in As(III) concentration thus provide two linear calibration ranges (0-4.0 mmol L and 4.0-10 mmol L). The fluorescence quenching mechanism was investigated by using time-resolved fluorescence spectroscopy and molecular modeling. The detection limit of this sensor has been determined as equal to 0.96 µg L which is about 10 times lower than the WHO stipulated standard for As(III) in drinking water (10 µg L). The analytical performance and potential application of the nanosensor was compared to commercial field kits used in arsenic monitoring. The sensor proposed in this study is fast, sensitive and accurate for detection of As(III) in drinking water and environmental samples.
一种尺寸在 50 至 100nm 之间的还原氧化石墨烯（rGO）和荧光素（FL）染料纳米粒子复合物已经被制备出来，并报告了其用于检测饮用水中 As(III)的传感性能。当 As(III)与 rGO-FL 纳米粒子结合时，荧光的相对猝灭随着 As(III)浓度的增加而增加，从而提供了两个线性校准范围（0-4.0mmol L 和 4.0-10mmol L）。通过使用时间分辨荧光光谱和分子建模研究了荧光猝灭机制。该传感器的检测限被确定为等于 0.96µg L，这比世界卫生组织规定的饮用水中 As(III)的标准（10µg L）低约 10 倍。将纳米传感器的分析性能和潜在应用与用于砷监测的商业现场试剂盒进行了比较。与商业试剂盒相比，本研究提出的传感器在检测饮用水和环境样品中的 As(III)方面快速、灵敏且准确。
