Aplicação de planejamento fatorial a protocolo de extração e fixação de sulfetos volatilizáveis por acidificação (SVA) em amostras de sedimento

Química Nova

Danielle Caroline Schnitzler²  Marco Tadeu Grassi²  Sueli Pércio Quinaia¹ 

[1] ,Universidade Federal do Paraná Departamento de Química Curitiba PR ,Brasil

关键词: factorial design;    sediments;    AVS;   

DOI  :  10.1590/S0100-40422009000500038

来源: SciELO

【 摘 要 】

The AVS is defined operationally as acid volatile sulfide, which is a controlling phase on the partition of some metallic species in sediments. A Factorial design was evaluated by means of 16 experiments and using four variables: temperature, extraction time, N2 flow, and volume of the S2- collection solution. The factors that contributed to the efficiency of the process were the extraction time and the N2 flow. Trapping of S2- was efficient in AAB. The S2- was quantified using a potentiometric procedure. Recovery tests for S2- concentrations varying from 1×10-5 to 1×10-4 mol L-1 were in the range from 93 to 116%.

【 授权许可】

CC BY-NC   
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