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Gold nanoparticles based solid‐phase microextraction coatings for determining organochlorine pesticides in aqueous environmental samples
Author(s) -
GutiérrezSerpa Adrián,
RocíoBautista Priscilla,
Pino Verónica,
JiménezMoreno Francisco,
JiménezAbizanda Ana I.
Publication year - 2017
Publication title -
journal of separation science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.72
H-Index - 102
eISSN - 1615-9314
pISSN - 1615-9306
DOI - 10.1002/jssc.201700046
Subject(s) - solid phase microextraction , organochlorine pesticide , pesticide , aqueous solution , environmental chemistry , colloidal gold , nanoparticle , chromatography , chemistry , solid phase extraction , gas chromatography , materials science , gas chromatography–mass spectrometry , nanotechnology , mass spectrometry , organic chemistry , agronomy , biology
The use of solid‐phase microextraction coatings based on gold nanoparticles was investigated, focusing the attention on the preparation of nanoparticles with nonclassical reduction agents of HAuCl 4 such as gallic acid and H 2 O 2 , rather than the conventional sodium citrate. All nanoparticles were characterized by diode array spectroscopy, whereas novel nanoparticles prepared with gallic acid and H 2 O 2 were also characterized by microscopic techniques. Solid‐phase microextraction coatings were prepared with a layer‐by‐layer approach. Gallic acid permitted the preparation of stable nanoparticles with milder experimental conditions (1 min, room temperature) and provided the most uniform coatings (thickness ∼3 μm). Seven organochlorine pesticides were determined in different environmental waters using gas chromatography with electron capture detection. Despite the low thickness of the coatings, limits of detection of the entire method down to 0.13 μg/L were obtained. A comparison with the commercial polyacrylate in terms of the partition coefficients of the analytes to the coatings gave logarithm of the partition coefficient values two times higher with gallic acid than polyacrylate (although the commercial fiber is 28 times thicker). Interfiber relative standard deviation values ranged from 8.67 to 21.3%. Optimum fibers also presented an adequate lifetime (>100 extractions).