Coupling a gas diffusion cell to a sequential injection system for spectrophotometric determination of sulfide

Química Nova

Masini, Jorge Cesar¹  Silva, Marcelo Solitrenick Pinto¹  Universidade de São Paulo, São Paulo¹ 

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

DOI  :  10.1590/S0100-40422004000400006

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 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】

Unknown