THE GENERALIZED STANDARD ADDITION METHOD IN A CLOSED-LOOP FLOW SYSTEM
| Autor: | Indira Lugo, Luis E. León, Hermes Carrero |
|---|---|
| Rok vydání: | 2001 |
| Předmět: |
Flow injection analysis
Chemistry Biochemistry (medical) Clinical Biochemistry Detector Mathematical analysis Analytical chemistry Standard solution Biochemistry Sample (graphics) Analytical Chemistry Matrix (chemical analysis) Volume (thermodynamics) Standard addition Electrochemistry Closed loop Spectroscopy |
| Zdroj: | Analytical Letters. 34:2735-2745 |
| ISSN: | 1532-236X 0003-2719 |
| Popis: | A new approach using flow-injection configuration is proposed as an alternative to apply the generalized standard addition method. The flow system contains a calibrated closed loop in which a spectrophotometric flow-cell is placed. The sample is entrapped into the closed loop by a suitable valve and it is allowed repetitive passages through the flow-cell; the addition of the standard solutions is made through an additional sample valve with a relatively small sample volume. After the addition, transient signals are obtained due to the repetitive passage of the added standard through the detector until it is completely dispersed into the sample by a mixing chamber. The proposed method resembles the manual, conventional procedure; a very small volume of standard solution is added to a relatively large volume of sample in such a way that the matrix of the latter is not significantly modified. Mathematical derivations that relate the concentration of the sample with that of the standard and the number of addi... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
| Nepřihlášeným uživatelům se plný text nezobrazuje | K zobrazení výsledku je třeba se přihlásit. |