期刊
MICROCHIMICA ACTA
卷 185, 期 7, 页码 -出版社
SPRINGER WIEN
DOI: 10.1007/s00604-018-2880-9
关键词
Metallic nanoparticles; Nanomaterials; Novel coatings; Environmental analysis; Water samples; Underground water
资金
- Spanish Ministry of Economy and Competitiveness (MINECO) [MAT2014-57465-R, MAT2017-89207-R]
The authors describe a new coating for use in solid-phase microextraction (SPME). Silver nanoparticles (AgNPs) were prepared by using gallic acid or glucose as the reducing agents, and then supported onto a stainless steel wire that was previously coated with a silver mirror. Coating with AgNPs was performed by a layer-by-layer approach of up to eight cycles of consecutive deposition of AgNPs and the thiol linker 1,8-octanedithiol. This procedure allows proper control of the coating thickness. Thicknesses are 3.2 mu m and 3.5 mu m with AgNPs obtained with gallic acid and glucose, respectively. This is in agreement with theoretical estimations (3.8 mu m). The fibers were used in the direct-immersion SPME-GC-FID determination of 16 polycyclic aromatic hydrocarbons (PAHs) from different waters. The performance of the method was compared to the one using polydimethylsiloxane fibers (100 mu m), which is the most suitable commercial SPME fiber for PAHs. Despite the low thickness of the AgNP coatings (compared to PDMS), the analytical features of the method using the most adequate coating (AgNPs prepared with gallic acid) include: (a) limits of detection down to 0.6 ng.mL(-1); (b) intra-day, inter-day, and inter-fiber precisions (expressed as RSDs) lower than 22, 26 and 25%, respectively; and (c) an operational lifetime of similar to 150 extractions/desorption cycles. The analysis of various spiked environmental waters using these fibers resulted in adequate analytical performance.
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