Universidade Federal de Minas Gerais, Departamento de Química, ICEx, Av. Antônio Carlos, 6627, 31270901 Belo Horizonte, MG, Brazil.
University Toulouse, ENSIACET, UPS INP LCC, Lab Chim Coordinat, UPR 8241, CNRS, 4 Allee Emile Monso, BP 44362, F-31030 Toulouse, France.
Talanta. 2017 May 15;167:538-543. doi: 10.1016/j.talanta.2017.02.054. Epub 2017 Feb 27.
This article describes a simple, efficient, and versatile magnetic carbon nanotubes (MCNT) method for sampling and pre-concentration of pesticides in environmental water samples. The multi-walled magnetic carbon nanotubes were obtained by chemical deposition vapor (CVD) process. The MCNTs structures are formed of hydrophobic and hydrophilic fractions that provide great dispersion at any water matrix allowing simultaneously a high efficiency of pesticides sorption. Following the extraction, analytes were desorbed with minor amounts of solvent and analyzed by gas chromatography coupled mass spectrometry (GC/MS). The parameters amount of MCNTs used to extraction, desorption time, and desorption temperature were optimized. The method showed good linearity with determination coefficients between 0.9040 and 0.9733. The limits of detection and quantification were ranged between 0.51 and 2.29µgL and between 1.19 and 5.35µgL respectively. The recovery ranged from 79.9% to 111.6%. The method was applied to the determination of fifteen multiclass pesticides in real samples of environmental water collected in Minas Gerais, Brazil.
本文描述了一种简单、高效、通用的磁性碳纳米管（MCNT）方法，用于环境水样中农药的采样和预浓缩。多壁磁性碳纳米管通过化学气相沉积（CVD）过程获得。MCNTs 结构由疏水性和亲水性部分组成，在任何水基质中都能提供良好的分散性，同时允许农药的吸附具有高效率。萃取后，用少量溶剂解吸分析物，并通过气相色谱-质谱联用（GC/MS）进行分析。优化了萃取用 MCNTs 的用量、解吸时间和解吸温度等参数。该方法具有良好的线性关系，测定系数在 0.9040 到 0.9733 之间。检测限和定量限的范围分别为 0.51 到 2.29µgL 和 1.19 到 5.35µgL。回收率在 79.9%到 111.6%之间。该方法应用于测定巴西米纳斯吉拉斯州环境水样中十五种多类农药。
