Preparation of Organophilic Nanohybrid Kaolinite and Application to the Electrochemical Detection of Organic Pesticides,Electroanalysis

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Preparation of Organophilic Nanohybrid Kaolinite and Application to the Electrochemical Detection of Organic Pesticides
Electroanalysis ( IF 2.7 ) Pub Date : 2017-09-18 , DOI: 10.1002/elan.201700412
Guy B. P. Ngassa _{1,

2} , Jonathan Fafard ₂ , Christian Detellier ₂

Affiliation

Novel organophilic nanohybrid materials (K-TDD) were obtained by the grafting of 1,2-tetradecanediol (TDD) onto the surface of kaolinite (K). XRD, IR, TGA-DTG, and SEM characterization showed that TDD grafting results in a partial exfoliation of kaolinite layers. This material was used to modify a glassy carbon electrode (GCE/K-TDD) and applied for the trace analysis of methyl parathion (MP). The signal of MP recorded on GCE/K-TDD was found more intense compared to the unmodified GCE, or to one modified with a film of natural kaolinite. Several parameters that can affect the stripping response were systematically investigated to optimize the sensitivity of the organokaolinite-modified electrode. A linear calibration curve for MP was obtained in the concentration range from 2×10−6 to 14×10−6 mol L−1 in acetate buffer (pH 6), giving a detection limit of 9×10−8 mol L−1. The sensitivity of the method was found to be 2.42 μA/μM for the range of concentrations that gives a linear calibration curve. The electrode was shown to be very stable, with the electrochemical response of MP decreasing by only 1.5 % after a series of nine measurements. The interference of various inorganic ions and organic compounds likely to influence the stripping determination of the MP were also examined. The results showed that the GCE/K-TDD electrode was effective in solutions containing interfering species and could be applied for the quantification of MP pesticides in natural water.

中文翻译：

亲有机纳米杂化高岭石的制备及其在有机农药电化学检测中的应用

通过将 1,2-十四烷二醇 (TDD) 接枝到高岭石 (K) 的表面上，获得了新型亲有机纳米杂化材料 (K-TDD)。XRD、IR、TGA-DTG 和 SEM 表征表明 TDD 接枝导致高岭石层部分剥离。该材料用于修饰玻碳电极 (GCE/K-TDD) 并应用于甲基对硫磷 (MP) 的痕量分析。与未改性的 GCE 或用天然高岭石薄膜改性的 GCE 相比，发现在 GCE/K-TDD 上记录的 MP 信号更强。为了优化有机高岭石改性电极的灵敏度，系统地研究了几个可能影响剥离响应的参数。在醋酸盐缓冲液 (pH 6) 中，浓度范围为 2×10-6 至 14×10-6 mol L-1 时，获得了 MP 的线性校准曲线，给出 9×10-8 mol L-1 的检测限。发现该方法的灵敏度对于提供线性校准曲线的浓度范围为 2.42 μA/μM。该电极表现出非常稳定，在一系列九次测量后，MP 的电化学响应仅下降了 1.5%。还检查了可能影响 MP 溶出测定的各种无机离子和有机化合物的干扰。结果表明，GCE/K-TDD 电极在含有干扰物质的溶液中有效，可用于天然水中 MP 农药的定量。在一系列九次测量后，MP 的电化学响应仅下降了 1.5%。还检查了可能影响 MP 溶出测定的各种无机离子和有机化合物的干扰。结果表明，GCE/K-TDD 电极在含有干扰物质的溶液中有效，可用于天然水中 MP 农药的定量。在一系列九次测量后，MP 的电化学响应仅下降了 1.5%。还检查了可能影响 MP 溶出测定的各种无机离子和有机化合物的干扰。结果表明，GCE/K-TDD 电极在含有干扰物质的溶液中有效，可用于天然水中 MP 农药的定量。

更新日期：2017-09-18

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