Demonstrando os fundamentos, potencialidades e limitações da análise por injeção seqüencial Demonstrating the fundamentals, potentialities and limitations of sequential injection analysis

Química Nova

关键词: sequential injection;    spectrophotometry;    phosphate;   

DOI  :  10.1590/S0100-40422008000300040

来源: DOAJ

【 摘 要 】

The sensitivity and accuracy of sequential injection methods are dependent on efficient overlapping of reagent and sample zones as they are propelled toward the detector cell. The formation of the reduced phosphomolybdic acid is used to demonstrate that the overlapping efficiency in a fixed reaction coil relies on a suitable choice of reagent to sample volume ratio. Additionally, under poor mixing conditions or highly concentrated samples, the reaction extension is strongly dependent on the reagent concentration. The zone-sampling concept is exploited to determine phosphate in cola-based soft drinks after in-line dilution in an auxiliary coil.

【 授权许可】

Unknown