Lersanansit Nantanat, Pungjunun Kingkan, Chailapakul Orawon, Praphairaksit Narong
Electrochemistry and Optical Spectroscopy Center of Excellence (EOSCE), Department of Chemistry, Faculty of Science, Chulalongkorn University, 254 Phayathai Road, Pathumwan, Bangkok, 10330, Thailand.
Electrochemistry and Optical Spectroscopy Center of Excellence (EOSCE), Department of Chemistry, Faculty of Science, Chulalongkorn University, 254 Phayathai Road, Pathumwan, Bangkok, 10330, Thailand; Center of Excellence on Petrochemical and Materials Technology, Chulalongkorn University, Thailand.
Talanta. 2024 Aug 15;276:126211. doi: 10.1016/j.talanta.2024.126211. Epub 2024 May 5.
A portable device offering effortlessness, mobility, and affordability for real-time and on-site monitoring of heavy metals is currently in great demand to maintain environmental sustainability. Herein, a platform utilizing a biopolymeric gel-based electrolyte for the on-field simultaneous determination of Cd(II) and Pb(II) is described. Pectin, a natural polymer, was exploited as a chemical delivery medium on account of its biodegradability, environmental friendliness, and rapid dissolving characteristics. The gel electrolyte was prepared by having pectin dissolved in KCl mixed with Sb(III)-Bi(III) bimetallic alloy solution, and casted onto a paper substrate. An in situ bimetallic alloy and pre-mixed bismuth nanoparticles modified screen-printed graphene electrode (Sb-Bi/BiNP/SPGE) were employed to enhance the electrochemical signals of Cd(II) and Pb(II) for the differential pulse anodic stripping voltammetry (DPASV). It was demonstrated that the platform was capable of generating sharp and well-defined current signals, achieving the low detection limits of 50.98 ng mL for Cd(II) and 40.80 ng mL for Pb(II). The reproducibility, as indicated by the relative standard deviation, was found to be less than 10.4 % (n = 10) for the developed gel-based device when coupled with a wireless near field communication (NFC) potentiostat. Lastly, the obtained sensor was applied for quantification of Cd and Pb in potentially contaminated groundwater samples. The recoveries obtained were satisfactorily within the acceptable range. The newly designed platform exhibited several advantages, including small sample volume (μL), low-cost, no sample preparation requirements, and being environmentally friendly. The convenience of a portable device utilizing the proposed biopolymeric gel-based electrolyte for on-field analysis makes it highly appealing for various applications.
为了维持环境可持续性，目前迫切需要一种便携式设备，该设备能够轻松实现实时和现场重金属监测，且具备移动性和可承受性。在此，本文描述了一种利用基于生物聚合物凝胶的电解质进行现场同时测定Cd(II)和Pb(II)的平台。果胶是一种天然聚合物，因其具有生物可降解性、环境友好性和快速溶解特性，被用作化学传递介质。将果胶溶解在与Sb(III)-Bi(III)双金属合金溶液混合的KCl中制备凝胶电解质，并浇铸在纸质基底上。采用原位双金属合金和预混合铋纳米颗粒修饰的丝网印刷石墨烯电极(Sb-Bi/BiNP/SPGE)来增强Cd(II)和Pb(II)的电化学信号，用于差分脉冲阳极溶出伏安法(DPASV)。结果表明，该平台能够产生尖锐且明确的电流信号，Cd(II)的检测限低至50.98 ng/mL，Pb(II)的检测限低至40.80 ng/mL。当与无线近场通信(NFC)恒电位仪结合使用时，所开发的基于凝胶的装置的相对标准偏差表明其重现性小于10.4%(n = 10)。最后，将所得传感器应用于对潜在受污染的地下水样品中的Cd和Pb进行定量分析。获得的回收率令人满意，在可接受范围内。新设计的平台具有几个优点，包括小样本体积(μL)、低成本、无需样品制备以及环境友好。利用所提出的基于生物聚合物凝胶的电解质的便携式设备进行现场分析的便利性使其在各种应用中极具吸引力。
