A flow injection analysis (FIA) system Is presented In which the reagent and sample are simultaneously Injected for multicomponent analysis. A simple eight-port valve Is described to perform the double Injection. The method Is Illustrated by the determination of nickel and Iron In a model plating bath solution. First-order calibration methods Including classical least squares (CLS), principal components regression (PCR), and partial least squares (PLS) are used to analyze the complex time profiles that this method provides. This study shows that very moderate sampling rates and small calibration data sets can be used with multivariate calibration techniques.
By virtue of their compactness, long-term stability, minimal reagent consumption and robustness, miniaturized sequential injection instruments are well suited for automation of assays onboard research ships. However, in order to reach the sensitivity and limit of detection required for open-ocean determinations of trace elements, it is necessary to preconcentrate the analyte prior its derivatization and subsequent detection by fluorescence. In this work, a novel method for the determination of dissolved zinc (Zn) at subnanomolar levels in seawater is described. The proposed method combines, for
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.