Flow Injection Spectrophotometric Determination of Fenoxaprop-p-ethyl Herbicide in Different Grain Samples after Derivatization
نویسنده
چکیده
Propomos um método espectrofotométrico para a determinação do herbicida fenoxaprop-p-etil, usando injeção em fluxo.O fenoxaprop-p-etil foi convertido num ácido hidroxamico, na presença de hidroxilamina dihidrocloridrica em meio alcalino. O ácido hidroxâmico obtido reagiu com ferro(III) formando um complexo hidroxamato de ferro(III), vermelho. A absorbância do complexo foi medida a 500 nm em sistema de injeção em fluxo. O método apresenta linearidade entre 1,0-20,0 μg mL com absortividade molar de 1,81 × 10 L mol cm. O limite de detecção e o limite de quantificação encontrados foram 0,29 ± 0,1 μg mL e 0,96 ± 0,1 μg mL respectivamente. Médias similares de limite de detecção e limite de quantificação foram encontradas para a determinação de residuos, entre 0,35 -1 e 0,45 μg g respectivamente para grãos de trigo, e 1,2 e 1,5 μg g respectivamente para grãos de cevada. A velocidade de determinação foi de 90 amostras h. O método foi aplicado com sucesso em amostras de diferentes grãos.
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