Encontrados 18 documentos, a visualizar página 1 de 2
Simultaneous determination of tartaric acid and potassium in wines using a mult...
Oliveira, Sara M.; Lopes, Teresa I. M. S.; Tóth, Ildikó V.; Rangel, António O. S. S.A multicommuted flow system with the propulsion device placed before detection is proposed for the determination of tartaric acid and free potassium in table and Port wines. A dialysis unit was introduced to increase sample dilution and minimize matrix interferences. The determination of tartaric acid was based on the spectrophotometric monitorization of the complex formed by the dialyzed analyte with vanadate....
Simultaneous determination of tartaric acid and potassium in wines using a dial...
Oliveira, Sara M.; Lopes, Teresa I. M. S.; Tóth, Ildikó V.; Rangel, António O. S. S.
Desenvolvimento de um sistema multi-comutado para a determinação de SO2 livre e...
Oliveira, Sara M.; Lopes, Teresa I. M. S.; Tóth, Ildikó V.; Rangel, António O. S. S.
Desenvolvimento de um sistema multi-comutado para a determinação de SO2 livre e...
Oliveira, Sara M.; Lopes, Teresa I. M. S.; Tóth, Ildikó V.; Rangel, António O. S. S.
Spectrophotometric determination of ammonium in coastal waters using a multicom...
Oliveira, Sara M.; Lopes, Teresa I. M. S.; Tóth, Ildikó V.; Rangel, António O. S. S.
Determinação espectrofotométrica de N-NH4 + em águas salinas utilizando um sist...
Oliveira, Sara M.; Lopes, Teresa I. M. S.; Tóth, Ildikó V.; Rangel, António O. S. S.
Spectrophotometric determination of ammonium in coastal waters using a multicom...
Oliveira, Sara M.; Lopes, Teresa I. M. S.; Tóth, Ildikó V.; Rangel, António O. S. S.
Determinação espectrofotométrica de N-NH4 + em águas salinas utilizando um sist...
Oliveira, Sara M.; Lopes, Teresa I. M. S.; Tóth, Ildikó V.; Rangel, António O. S. S.
Sequential injection determination of nitrate in vegetables by spectrophotometr...
Oliveira, Sara M.; Lopes, Teresa I. M. S.; Rangel, António O. S. S.A sequential injection system for the determination of nitrate (NO3 2) in vegetables was developed to automate this determination, allowing for substantially reduced reagent consumption and generated waste using low-cost equipment. After extraction with water and filtration, the extracted nitrate is reduced inline to nitrite in a copperized cadmium (Cd) column and determined as nitrite. According to the Griess–...
A multi-commuted flow injection system with a multi-channel propulsion unit pla...
Oliveira, Sara M.; Lopes, Teresa I.M.S.; Tóth, Ildikó V.; Rangel, António O.S.S.A flow system with a multi-channel peristaltic pump placed before the solenoid valves is proposedto overcome some limitations attributed to multi-commuted flow injection systems:the negative pressure can lead to the formation of unwanted air bubbles and limits the useof devices for separation processes (gas diffusion,dialysis or ion-exchange). The proposed approach was applied to the colorimetric determination ...
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