表面增强拉曼光谱增强配体交换对土壤水中超灵敏新烟碱检测的研究

IF 12.4 1区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Water Research Pub Date : 2025-07-20 DOI:10.1016/j.watres.2025.124268

Shengdong Liu , Haoran Wei

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引用次数: 0

摘要

新烟碱类（neonics），包括吡虫啉（IMD）、噻虫胺（CLO）和噻虫嗪（THI），占全球农药市场的25%以上，对生态系统和人类健康构成重大风险。为了满足对这些新兴污染物进行可靠、快速和经济有效监测的迫切需求，开发了一种基于优化配体交换表面增强拉曼光谱（SERS）的超灵敏分析方法。研究了质子和卤化物对柠檬酸盐包覆金纳米粒子（AuNPs） SERS检测IMD、CLO和THI的协同效应。在pH为1时，柠檬酸盐被充分质子化，并且很容易从AuNP表面解吸，从而使neonics吸附并增强其SERS信号。氯离子进一步促进了柠檬酸盐的脱附，并在neonics和aunp之间起分子桥梁作用。除了增加氖吸附外，还诱导广泛的AuNP聚集和SERS热点形成，导致SERS强度放大。通过结合质子和卤化物，检测灵敏度显着提高，可以在低至2-5 nM的浓度下检测IMD， CLO和THI。该方法成功地应用于实际土壤水样中新烟碱的检测，为农业径流中新烟碱的原位监测提供了一种简单、高灵敏度的方法。

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Enhanced ligand exchange for ultrasensitive neonicotinoid detection in soil water via surface-enhanced Raman spectroscopy

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Enhanced ligand exchange for ultrasensitive neonicotinoid detection in soil water via surface-enhanced Raman spectroscopy

Neonicotinoids (neonics), including imidacloprid (IMD), clothianidin (CLO), and thiamethoxam (THI), account for over 25 % of the global pesticide market and pose significant risks to ecosystems and human health. To address the urgent need for reliable, rapid, and cost-effective monitoring of these emerging contaminants, an ultrasensitive analytical method based on optimized ligand exchange-enabled surface-enhanced Raman spectroscopy (SERS) was developed. The synergistic effects of protons and halides on the SERS detection of IMD, CLO, and THI using citrate-capped gold nanoparticles (AuNPs) were investigated. At pH 1, citrate was fully protonated and readily desorbed from AuNP surfaces, allowing neonics to adsorb and enhancing their SERS signals. Chloride ions further facilitated citrate desorption and served as molecular bridges between neonics and AuNPs. In addition to increased neonic adsorption, extensive AuNP aggregation and SERS hot spot formation were induced, leading to amplified SERS intensities. By combining protons and halides, detection sensitivity was significantly improved, enabling IMD, CLO, and THI detection at concentrations as low as 2–5 nM. This method was successfully applied to detect neonics in real soil water samples, providing a simple, highly sensitive approach for in-situ monitoring of neonicotinoids in agricultural runoff.

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来源期刊

Water Research 环境科学-工程：环境

CiteScore

20.80

自引率

9.40%

发文量

1307

审稿时长

38 days

期刊介绍： Water Research, along with its open access companion journal Water Research X, serves as a platform for publishing original research papers covering various aspects of the science and technology related to the anthropogenic water cycle, water quality, and its management worldwide. The audience targeted by the journal comprises biologists, chemical engineers, chemists, civil engineers, environmental engineers, limnologists, and microbiologists. The scope of the journal include: •Treatment processes for water and wastewaters (municipal, agricultural, industrial, and on-site treatment), including resource recovery and residuals management; •Urban hydrology including sewer systems, stormwater management, and green infrastructure; •Drinking water treatment and distribution; •Potable and non-potable water reuse; •Sanitation, public health, and risk assessment; •Anaerobic digestion, solid and hazardous waste management, including source characterization and the effects and control of leachates and gaseous emissions; •Contaminants (chemical, microbial, anthropogenic particles such as nanoparticles or microplastics) and related water quality sensing, monitoring, fate, and assessment; •Anthropogenic impacts on inland, tidal, coastal and urban waters, focusing on surface and ground waters, and point and non-point sources of pollution; •Environmental restoration, linked to surface water, groundwater and groundwater remediation; •Analysis of the interfaces between sediments and water, and between water and atmosphere, focusing specifically on anthropogenic impacts; •Mathematical modelling, systems analysis, machine learning, and beneficial use of big data related to the anthropogenic water cycle; •Socio-economic, policy, and regulations studies.