In this work, a Layered Double Hydroxide (NiAl-LDH) was obtained by coprecipitation method and used to elaborate an electrochemical sensor for the determination of isoproturon, which is a hazardous pollutant, widely used in agriculture, and its residue is distributed into aqueous environment through run-off and leaching from the soil. Various physicochemical techniques such as FT-IR spectroscopy, X-ray diffraction, and thermal analysis were used to characterize this material. The anionic exchange capacity of NiAl-LDH on carbon paste modified electrode was investigated toward [Fe(CN)₆]^3- using cyclic voltammetry. Used as electrode modifier of carbon paste electrode for isoproturon detection, a remarkable increase in isoproturon signal on modified carbon paste electrode by LDH was observed. The peak current obtained after 3 min of preconcentration in 25 μM ISO on NiAl-LDH/CPE was 2.6 times higher than that exhibited by the same analyte on the unmodified CPE, thereby opening the way to the development of a sensitive method for the detection of ISO. Other parameters that can affect the stripping response (preconcentration time, pH of detection medium, and LDH loading within the paste) were investigated to optimize the proposed sensor. After optimization, a linear calibration curve was obtained in the concentration range from 2 × 10⁻⁸ to 1.8 × 10⁻⁷ M, leading to a detection limit of 1 × 10⁻⁹ M (S/N = 3). The relative standard deviation for 5 identical measurements was 2.7%. The interfering effect of some compounds and ions was examined on the stripping response of ISO. The applicability of the method was verified by the determination of ISO in spiked water sample.

中文翻译：

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一种基于低成本层状双氢氧化物（LDH）的安培传感器，用于使用碳糊修饰电极检测水中的异丙隆。

本研究通过共沉淀法获得了一种层状双氢氧化物（NiAl-LDH），并用于制备电化学传感器，用于测定农业上广泛使用的有害污染物异丙隆，其残留物分布在水环境中。通过径流和从土壤中浸出。各种物理化学技术（例如FT-IR光谱，X射线衍射和热分析）用于表征该材料。研究了NiAl-LDH在碳糊修饰电极上对[Fe（CN）₆ ] ^3-的阴离子交换能力。使用循环伏安法。用作碳糊电极的异丙基异丁酮的电极改性剂，通过LDH观察到改性碳糊电极上的异丙磺隆信号显着增加。富集的3分钟后在25中得到的峰值电流 μ上的NiAl-LDH中号ISO / CPE比由相同的分析物上的未修饰的CPE展出，从而开辟了道路的敏感方法的发展，用于检测的2.6倍ISO。研究了其他可能影响剥离反应的参数（预浓缩时间，检测介质的pH值和糊中LDH的含量），以优化建议的传感器。优化后，在2×10 ^-8至1.8×10 ^-7的浓度范围内获得线性校准曲线 M，导致检测限为1×10 ^-9  M（S / N = 3）。5次相同测量的相对标准偏差为2.7％。研究了一些化合物和离子对ISO剥离反应的影响。该方法的适用性通过测定加标水样品中的ISO来验证。