Selective extractions to assess the biogeochemically relevant fractionation of inorganic mercury in sediments and soils
| Autor: | N. S. Bloom, Eve Preus, Misti Hiltner, Jodie Katon |
|---|---|
| Rok vydání: | 2003 |
| Předmět: |
Detection limit
MERCURE Goethite Chemistry chemistry.chemical_element Fractionation Biochemistry Analytical Chemistry Mercury (element) chemistry.chemical_compound visual_art Reagent Environmental chemistry visual_art.visual_art_medium Environmental Chemistry Aqua regia Leaching (metallurgy) Spectroscopy |
| Zdroj: | Analytica Chimica Acta. 479:233-248 |
| ISSN: | 0003-2670 |
| DOI: | 10.1016/s0003-2670(02)01550-7 |
| Popis: | Here we present a new method for sequential selective extractions (SSEs) for Hg in geological solids, validated with extensive quality assurance procedures. Mercury was separated into fractions which “make sense” biogeochemically, rather than being identified by specific compounds. Experiments elucidated the effects of extraction time, solids-to-liquid ratio, and alternate solvents in natural samples, reference materials, and pure compounds. Compounds tested included HgS (red and black), HgCl2 ,H g 0 ,H g 2Cl2, HgSe, HgO, Hg(II) adsorbed on goethite, Hg–humate, and gold amalgamated Hg. Based on these findings, a five-step sequence of extractions was established to separate the compounds into biogeochemically distinct categories. The fractions and leaching media were as follows: F1 (deionized water), F2 (0.01 M HCl + 0. 1M CH3COOH), F3 (1 M KOH), F4 (12 M HNO 3), and F5 (aqua regia). Method blanks and method detection limits (MDLs) of 0.1–5 ng/g were obtained for the various analytical fractions, depending on the reagent concentrations used. Precision ranged from 2 to 8% for the major fractions in a sample, but increased to 2–40% for fractions making up |
| Databáze: | OpenAIRE |
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