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Iron specification in bathing waters using sequential labe-on-valve (si-Lov) so...

Exploiting the lab-on-valve concept to study the 3,4-HPO chelator as non-toxc r...

Spectrophotometric determination of Bromate in water using multisyringe flow in...

A multisyringe flow injection system for the spectrophotometric determination of bromate in water is proposed, based on the oxidation of phenothiazine compounds by bromate in acidic medium. Several phenothiazines were tested, including chlorpromazine, trifluoperazine, and thioridazine. Higher sensitivity and lower LOD were attained for chlorpromazine. Interference from nitrite, hypochlorite, and chlorite was el...

Simultaneous determination and classification of riboflavin, thiamine, nicotina...

Soft Independent Modeling of Class Analogy and Partial Least Squares Regression were used in this work for the identification and quantification of thiamine, riboflavin, nicotinamide and pyridoxine by UV-Vis spectrophotometry, without separation or preconcentration steps in the analytical procedure. For quantitative purposes, the working range established was 1-14 mg L-1 for riboflavin, 2-26 mg L-1 for thiamine...

Spectrophotometric determination of bromate in drinking water using a multi-syr...

Spectrophotometric determination of bromate in drinking water using a multi-syr...

Multi-pumping flow system for the determination of dissolved orthophosphate and...

A multi-pumping flow system (MPFS) for the spectrophotometric determination of dissolved orthophosphate and dissolved organic phosphorus in wastewater samples is proposed. The determination of orthophosphate is based on the vanadomolybdate method. In-line ultraviolet photooxidation is employed to mineralise organic phosphorus to orthophosphate prior to detection. A solenoid valve allows the deviation of the flo...

The application of multicommutated flow techniques to the determination of iron

New flow techniques such as multicommutated flow-injection analysis (MCFIA), multi-syringe FIA (MSFIA) and multi-pumping flow systems (MPFSs) have been developed. The low reagent consumption achieved by these techniques should be highlighted, as they can be regarded as environmentally friendly alternatives to conventional FIA. We present several applications of these novel flow techniques to the determination o...

Avaliação comparativa da utilização de compostos da família das fenotiazinas pa...

Avaliação comparativa da utilização de compostos da família das fenotiazinas pa...