Halogenated pesticide analysis in orange juice by gas chromatography with electron capture detector (GC-ECD) with Ni-63 nuclide

Abstract:

Brazil has been gain space in the market of orange juice in the last years. For the exportation of this product to keep growing, its quality of this product must be ensured by puting in force more strictive legislations and custom barriers, in order to improve the well-being and health of the population. In this work were analyzed four orange juices brands produced in the State of São Paulo. It was quantified the acaricide known as Dicofol (2,2,2-trichloro-1,1-bis(4-chlorophenyl) ethanol) widely used to combat the Citrusleprosis virus, transmitted by mites to the citrus culture. This pesticide was chosen due to its importance in the production of orange in large scale and their indiscriminate use may pose risks to humans and of environment. The analytical technique applied was gas chromatography coupled with electron capture detector (GC-ECD) using the 63Ni nuclide. This beta (β) radiation source ionizes the carrier gas (N2), generanting an electron current that forms the baseline. The analites pass through the detector and capture electrons, generating the analitycal signal that is proportional to the concentration of analite. The sample preparation was done by QuEChERS. The limits of detection (LOD) and quantification (LOQ) found were 0.005 and 0.025 mg kg-1 respectively. The applied methodology was efficient and presented excellent analytical sensitivity for the pesticide Dicofol, being that of four samples analyzed, only in one was found concentration of 0.03 mg kg-1, above the LOQ, however below the Maximum Residue Limit (MRL) for fruits (0.1 mg kg-1) established by Codex alimentarius.


Reference:
MANHANI, Kelly Cristina; AMARAL, Priscila O. ; BUSTILLOS, José O. V. ; MENDES, Cristiana de Almeida ; LACERDA, João Paulo Amorim de ; SILVA, Jorge Luiz da. Halogenated pesticide analysis in orange juice by gas chromatography with electron capture detector (GC-ECD) with Ni-63 nuclide. In: INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE – INAC, 2017, Belo Horizonte, MG. Proceedings… 11 p.

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