A novel miniaturized zinc oxide/hydroxylated multiwalled carbon nanotubes as a stir-brush microextractor device for carbamate pesticides analysis

作者：Makkliang Fonthip; Kanatharana Proespichaya; Thavarungkul Panote; Thammakhet Chongdee^*

来源：Analytica Chimica Acta, 2016, 917: 27-36.

DOI：10.1016/j.aca.2016.02.040

• Trace analysis
• Carbamate pesticides
• Zinc oxide
• Multiwalled carbon nanotubes
• Miniaturized solid phase extraction

A novel miniaturized "stir-brush microextractor" was prepared using a zinc oxide/hydroxylated multiwalled carbon nanotubes (ZnO/MWCNTs-OH) coated stainless steel brush connected to a small dc motor. The synthesized zinc oxide on each strand of stainless steel had a flower-like nanostructure when observed by a scanning electron microscope (SEM). This structure produced a large surface area before it was coated with the hydroxylated multiwalled carbon nanotubes sorbent. Under optimal conditions, the developed device provided a good linearity for the extraction of carbofuran and carbaryl, in the range of 25-500 ng mL(-1) and 50-500 ng mL(-1), respectively, with low limits of detection of 17.5 +/- 2.0 ng mL(-1) and 13.0 +/- 1.8 ng mL(-1). It also provided a good stir-brush-to-stir-brush reproducibility (% relative standard deviation < 5.6%, n = 6). The device was applied for the extraction and preconcentration of carbamate pesticides in fruit and vegetable samples prior to analysis with a gas chromatograph coupled with a flame ionization detector (GC-FID). Carbofuran was found at 9.24 +/- 0.93 ng g(-1) and carbaryl was detected at 7.05 +/- 0.61 ng g(-1) with good recoveries in the range of 73.7 +/- 10.0% to 108.4 +/- 2.6% for carbofuran and 75.7 +/- 10.0% to 111.7 +/- 5.7% for carbaryl.

• 出版日期2016-4-21