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

✍ Scribed by Alysson S. Barreto; Rogério Luiz da Silva; Silvia Caroline G. dos Santos Silva; Marcelo O. Rodrigues; Carlos A. de Simone; Gilberto F. de Sá; Severino A. Júnior; Sandro Navickiene; Maria Eliane de Mesquita

• Publisher: John Wiley and Sons
• Year: 2010
• Tongue: English
• Weight: 146 KB
• Volume: 33
• Category: Article
• ISSN: 1615-9306
• DOI: 10.1002/jssc.201000553

✦ Synopsis

Abstract

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.