Determination of triazine herbicides in environmental water samples by high-performance liquid chromatography using graphene-coated magnetic nanoparticles as adsorbent

• Published in: Analytica chimica acta 2011-12, Vol.708 (1), p.155-159
• Main Authors: Zhao, Guangying, Song, Shuangju, Wang, Chun, Wu, Qiuhua, Wang, Zhi
• Format: Article
• Language: English
• Subjects: Adsorbents; Adsorption; Analytical chemistry; Applied sciences; Arrays; Chemistry; Chromatographic methods and physical methods associated with chromatography; Chromatography, High Pressure Liquid; Exact sciences and technology; Extraction; Ferrosoferric Oxide - chemistry; Global environmental pollution; Graphene; Graphite - chemistry; Herbicides; Herbicides - analysis; Herbicides - isolation & purification; High performance liquid chromatography; Hydrogen-Ion Concentration; Linearity; Liquid chromatography; Magnetic nanoparticles; Magnetite Nanoparticles - chemistry; Nanoparticles; Other chromatographic methods; Pollution; Solid Phase Extraction; Standard deviation; Triazine herbicides; Triazines - analysis; Water Pollutants, Chemical - analysis; Water Pollutants, Chemical - isolation & purification; Water samples
• ISSN: 0003-2670; 1873-4324
• DOI: 10.1016/j.aca.2011.10.006

Effect of the amount of the magnetic nanoparticles (NPs) on the peak area of the triazines. Extraction conditions: sample volume, 250 mL; extraction time, 30 min; sample pH, 6.2; desorption solvent, 0.5 mL acetone; concentration of analytes, 5 ng mL −1. [Display omitted] ► A graphene-coated Fe 3O 4 magnetic nanoparticles (G-Fe 3O 4 MNPs) was used for the extraction of triazines from water samples. ► The extraction conditions by the G-Fe 3O 4 MNPs were investigated. ► The G-Fe 3O 4 MNPs proved to be an effective adsorbent. In this paper, a graphene-based Fe 3O 4 magnetic nanoparticles (G-Fe 3O 4 MNPs) was used as the adsorbent for the magnetic solid-phase extraction of some triazine herbicides (atrazine, prometon, propazine and prometryn) in environmental water samples followed by high performance liquid chromatography-diode array detection (HPLC-DAD). After the extraction, the adsorbent can be conveniently separated from the aqueous samples by an external magnet. The main factors influencing the extraction efficiency including the amount of the MNPs, the extraction time, the pH of sample solution, and desorption conditions were studied and optimized. Under the optimized experimental conditions, a good linearity was observed in the range of 0.1–50.0 ng mL −1 for all the analytes, with the correlation coefficients ( r) ranging from 0.9996 to 0.9999. The limits of detection of the method ranged between 0.025 and 0.040 ng mL −1. Good reproducibility was obtained with the relative standard deviations below 5.2%. The developed method was applied to the analysis of the triazine herbicides in different water samples (lake, river and reservoir). The recoveries of the method were in the range between 89.0% and 96.2%.