Fourier Transform Infrared Determination of Imidacloprid in Pesticide Formulations

نویسندگان

  • Guillermo Quintás
  • Sergio Armenta
  • Salvador Garrigues
  • Miguel de la Guardia
چکیده

Foi desenvolvido um método simples usando Infra-Vermelho com Transformada de Fourier (IRFT) para a determinação de Imidaclopride em formulações pesticidas. As amostram foram diluídas com CHCl 3 e os espectros de IRFT de amostras e padrões foram obtidos numa resolução nominal de 4 cm, entre 4000 e 900 cm, com acumulação de 25 espectros. A determinação de Imidaclopride foi feita medindo-se tanto a área do sinal obtido entre 1577 e 1567 cm ou a altura do sinal a 1572 cm, ambos com correção de linha base horizontal a 1900 cm. Os limites de detecção atingidos da ordem de 9 μg g, foram apropriados para a determinação de Imidoclopride em formulações comercias disponíveis. Os resultados com IRFT forma estatisticamente comparáveis àqueles encontrados para Cromatografia Líquida de Alta Performance (HPLC). O procedimento desenvolvido reduz o consumo de solventes orgânicos por preparação de amostra, de 53 mL de CH 3 CN requeridos com HPLC para 2,5 mL de CHCl 3 , reduzindo o descarte gerado, e aumenta a freqüência de medidas de 10 para 60 amostras h, quando comparado ao método de referência usando HPLC-UV.

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تاریخ انتشار 2004