Desarrollo de métodos automáticos de análisis por inyección en flujo multijeringa(MSFIA)para la determinación del ión sulfuro en aguas

Résumé

Multisyringe flow injection analysis (MSFIA) systems for automatic determination of sulfide in environmental and wastewater samples have been developed exploiting spectrophotometric detection prior derivatization of the analyte (oxidative coupling of sulfide with N-N-dimethyl-p-phenylenediamine in presence of Fe(III) to form methylene blue). - A MSFIA system was coupled to gas-diffusion separation to achieve the isolation from complex matrices without any pre-treatment batch sample. - An optrode using disk-based solid-phase extraction in a MSFIA set-up is proposed to determine trace levels. - A hyphenated method that combines the separation and pre-concentration is presented reaching high selectivity and sensitivity. - A fully automated smart MSFIA system for sulfide monitoring in a wide concentration range is proposed choosing by itself the best approach to quantify the analyte without the analyst intervention. - A review of flow-based methodologies for sulfide determination in aqueous matrices is presented. The characteristics of automated protocols using several detection systems are discussed.