Potential of a metal-organic framework as a new material for solid-phase extraction of pesticides from lettuce (Lactuca sativa), with analysis by gas chromatography-mass spectrometry.
The metal-organic framework (∞)[(La(0.9)Eu(0.1))(2)(DPA)(3)(H(2)O)(3)] was tested for extraction of pyrimicarb, procymidone, malathion, methyl parathion and α- and β-endosulfan from lettuce, with analysis using GC/MS in SIM mode. Experiments were carried out in triplicate at two fortification levels (0.1 and 0.5 mg/kg), and resulted in recoveries in the range of 78-107%, with RSD values between 1.6 and 8.0% for (∞)[(La(0.9)Eu(0.1))(2)(DPA)(3)(H(2)O)(3)] sorbent. Detection and quantification limits ranged from 0.02 to 0.05 mg/kg and from 0.05 to 0.10 mg/kg, respectively, for the different pesticides studied. The method developed was linear over the range tested (0.05-10.0 μg/mL), with correlation coefficients ranging from 0.9990 to 0.9997. Comparison between (∞)[(La(0.9)Eu(0.1))(2)(DPA)(3)(H(2)O)(3)] and conventional sorbent (silica gel) showed better performance of the (∞)[(La(0.9)Eu(0.1))(2)(DPA)(3)(H(2)O)(3)] polymeric sorbent for all pesticides tested.
Departamento de Química, Universidade Federal de Sergipe, São Cristóvão-SE, Brazil.
Alysson S
AS
Barreto
Rogério Luiz
RL
da Silva
Silvia Caroline G
SC
Dos Santos Silva
Marcelo O
MO
Rodrigues
Carlos A
CA
de Simone
Gilberto F
GF
de Sá
Severino A
SA
Júnior
Sandro
S
Navickiene
Maria Eliane
ME
de Mesquita
D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods*; D018545:Lactuca / Q000737:chemistry*; D057230:Limit of Detection; D010575:Pesticides / Q000032:analysis*; D012015:Reference Standards; D015203:Reproducibility of Results; D052616:Solid Phase Extraction / Q000295:instrumentation*; D017550:Spectroscopy, Fourier Transform Infrared
D010575:Pesticides