Speciation of Inorganic Arsenic in Groundwater as Molybdoarsenate by On-Site Solid-Phase Extraction and Graphite Furnace Atomic Absorption Spectrometry
| Autor: | Masaya Hirano, Toshio Kubota, Masahiko Murakami, Toshiaki Shibahara |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Detection limit
Ammonium molybdate 010401 analytical chemistry Biochemistry (medical) Clinical Biochemistry Inorganic chemistry Extraction (chemistry) chemistry.chemical_element 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Biochemistry 0104 chemical sciences Analytical Chemistry chemistry Electrochemistry medicine Seawater Solid phase extraction 0210 nano-technology Graphite furnace atomic absorption Spectroscopy Arsenic Activated carbon medicine.drug |
| Zdroj: | Analytical Letters. 49:2119-2131 |
| ISSN: | 1532-236X 0003-2719 |
| Popis: | Solid-phase extraction was used for on-site speciation and preconcentration of inorganic arsenic in groundwater involving the retention of molybdoarsenate on activated carbon. A total of 0.25 µg of As(V) in 50–500 mL of sample was selectively retained on 100 mg of activated carbon in a mini-column as molybdoarsenate at pH 2. A total of 0.1 mL of 0.26 mol/L ammonium molybdate was introduced for every 50 mL of the sample. As(III) was quantitatively retained with As(V) by adding 0.01 mL of 0.02 mol/L KMnO4 solution for every 50 mL of the sample prior to the addition of ammonium molybdate. The retained As(V) was quantitatively eluted by circularly passing 3 mL of 1 mol/L NH4OH through the column for at least 5 min with determination by graphite furnace atomic absorption spectrometry. A palladium chemical modifier was used to provide a detection limit and blank equivalent concentration of 0.047 and 0.19 µg/L, respectively (n = 6, sample volume of 50 mL). Concomitant ions in seawater or river water did ... |
| Databáze: | OpenAIRE |
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