Determinação espectrofotométrica do arsênio em cabelo usando o método do dietilditiocarbamato de prata (SDDC) e trietanolamina/CHCL3 como solvente

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Simone de Fátima Pinheiro Pereira
Sérgio Luis Costa Ferreira
Antonio Celso Spínola Costa
Augusto César Fonseca Sraiva
Antonia Kelen Frota Silva

Abstract

Pelo uso de técnicas mais baratas, como a do SDDC, é possível determinar níveis traços de arsênio em cabelo; entretanto esta técnica apresenta alguns inconvenientes como baixa estabilidade e o odor desagradável da piridina. A piridina foi substituída por trietanolamina/CHCl3 e as características analíticas do complexo foram estudadas.O complexo foi estável por 270 minutos, a faixa de aplicação da lei de Beer foi de 0,0 a 25,0 mg As, a repetibilidade foi de 0,028 mg As, o limite de detecção foi de 18,6 mg de As/L e a sensibilidade (e)? de 1,12 104 L.mol-1.cm-1. O método foi aplicado à amostras de cabelo. A lavagem das amostras foi feita com extran e água desionizada e seca em estufa (40-60ºC). 0,1000 g de amostra foi submetida à 11 métodos de digestão. O melhor método foi o que usou uma solução 1:1 de HNO3 e H2SO4 concentrados em temperatura de 100-110ºC com evaporação até fumos de SO3. O tempo de abertura é um inconveniente neste tipo de digestão.

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Pereira, S. de F. P., Ferreira, S. L. C., Costa, A. C. S., Sraiva, A. C. F., & Silva, A. K. F. (2002). Determinação espectrofotométrica do arsênio em cabelo usando o método do dietilditiocarbamato de prata (SDDC) e trietanolamina/CHCL3 como solvente. Eclética Química, 27(1), 155–170. https://doi.org/10.26850/1678-4618eqj.v27.1.2002.p155-170
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Original articles

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