Acoplamento de cela de difusão gasosa a sistema de análise por injeção seqüencial visando a determinação espectrofotométrica de sulfeto

Química Nova

Marcelo Solitrenick Pinto Silva¹  Jorge Cesar Masini¹ 

[1] ,Universidade de São Paulo Instituto de Química São Paulo SP

关键词: sequential injection analysis;    gas diffusion;    sulfide;   

DOI  :  10.1590/S0100-40422004000400006

来源: SciELO

【 摘 要 】

A new configuration for coupling a gas diffusion cell to a sequential injection system is presented. The matrix exchange is made without the need for additional rotary injection valves or peristaltic pumps, keeping the original mechanical components of the sequential injection apparatus: one syringe pump (or peristaltic pump) and one selection valve. The system was tested constructing analytical curves for sulfide exploring the formation of the methylene blue dye. The proposed method has a detection limit of 60 µg L-1 S2-, with a linear dynamic range between 0.10 and 4.0 mg L-1 S2- concentrations, with a sampling frequency of 20 h-1.

【 授权许可】

CC BY-NC   
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