Premium
Determination of pesticides in sugarcane juice employing microextraction by packed sorbent followed by gas chromatography and mass spectrometry
Author(s) -
Fumes Bruno Henrique,
Andrade Felipe Nascimento,
Neto Álvaro José dos Santos,
Lanças Fernando Mauro
Publication year - 2016
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.201600077
Subject(s) - chromatography , chemistry , sorbent , mass spectrometry , gas chromatography , gas chromatography–mass spectrometry , pesticide , solid phase microextraction , pesticide residue , adsorption , organic chemistry , agronomy , biology
This paper describes the development of a method for the determination of six pesticides (tebuthiuron, carbofuran, atrazine, metribuzine, ametryn, and bifenthrin) in sugarcane juice using microextraction by packed sorbent as the extraction technique. The extraction steps were optimized by factorial design, being the variables pH, ionic strength, desorption solvent and solvent volume optimized for comparisons among sorbent materials. Among the evaluated materials C18‐Chromabond ® showed better extraction efficiency. A factorial design 2 3 with central point was used for the extraction cycles optimization. Draw/eject and washes cycles showed significant improvements in the extraction efficiency when the number of cycles increased. The method was validated and showed a limit of quantification in the range of 2.0–10.0 μg.L −1 . The calibration curves were constructed by weighting models that reduced the sum of absolute residues values and improved determination coefficient. The matrix factor and extraction efficiency were 97.3–77.3% and 27.1–64.8%, respectively. The accuracy was 71.7–106.9%; precision evaluated as the coefficient of variance obtained in intra and inter day analysis was 4.5–15.9%. The method was applied to the determination of pesticide residues in four sugarcane juice samples commercially available in markets from different cities from São Paulo state, Brazil.