Spectrophotometric catalytic determination of Fe(III) in estuarine waters using a flow-batch system
| Autor: | Ana C. B. Dias, Ricardo S. Honorato, Josiane M. T. Carneiro, Elias A.G. Zagatto |
|---|---|
| Rok vydání: | 2002 |
| Předmět: |
Detection limit
medicine.diagnostic_test Sodium Analytical chemistry chemistry.chemical_element Mass spectrometry Biochemistry Analytical Chemistry Catalysis Salinity chemistry.chemical_compound chemistry Spectrophotometry medicine Environmental Chemistry Graphite furnace atomic absorption Hydrogen peroxide Spectroscopy |
| Zdroj: | Analytica Chimica Acta. 455:327-333 |
| ISSN: | 0003-2670 |
| DOI: | 10.1016/s0003-2670(01)01611-7 |
| Popis: | A flow-batch system was developed for the determination of Fe(III) in estuarine waters with high variability in salinity. The method is based on the catalytic effect of iron(III) on the oxidation rate of N , N -dimethyl- p -phenylenediammonium dichloride (DmPD) by hydrogen peroxide and the formed product is spectrophotometrically monitored at 554 nm. A controlled addition of sodium chloride to every assayed sample is accomplished for in-line individual salinity matching. The proposed system processes about 30 samples h −1 and yields reproducible results. Relative standard deviations were estimated as −1 Fe; ca. 0.5 mol l −1 Cl). Synthetic samples (15.0 μg l −1 Fe; 0.25–1.0 mol l −1 NaCl) were efficiently processed, and no significant differences in results were found at a probability level of 99.7%. The method works for the full range of salinities. Only 120 μg DmPD are consumed per determination. The analytical curve is linear up to about 60 μg l −1 Fe ( r >0.999; n =5) and the detection limit is 5 μg l −1 Fe. Results are in agreement with graphite furnace atomic absorption spectrometry. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect