Passive detection of Pb in water using rock phosphate agarose beads
| Autor: | Bret H. Howard, Sherie L. Edenborn, Harry M. Edenborn, Dorothy J. Vesper, James I. Sams |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Environmental Engineering
Environmental remediation Health Toxicology and Mutagenesis 0211 other engineering and technologies 02 engineering and technology 010501 environmental sciences engineering.material Bead 01 natural sciences Pyromorphite chemistry.chemical_compound Adsorption Environmental Chemistry Waste Management and Disposal Dissolution 0105 earth and related environmental sciences 021110 strategic defence & security studies Aqueous solution Chromatography Chemistry Pollution Phosphorite visual_art Environmental chemistry engineering visual_art.visual_art_medium Agarose |
| Zdroj: | Journal of Hazardous Materials. 336:240-248 |
| ISSN: | 0304-3894 |
| DOI: | 10.1016/j.jhazmat.2017.04.036 |
| Popis: | In this study, passive detectors for Pb were prepared by immobilizing powdered rock phosphate in agarose beads. Rock phosphate has been used to treat Pb-contaminated waters and soil by fixing the metal as an insoluble pyromorphite mineral. Under lab conditions, Pb was rapidly adsorbed from aqueous solution by the beads over time, consistent with the acidic dissolution of rock phosphate, the precipitation of pyromorphite within the pore space of the agarose gel matrix, and surface exchange reactions. Net accumulation of Pb occurred when beads were exposed to simulated periodic releases of Pb over time. Under field conditions, beads in mesh bags were effective at detecting dissolved Pb being transported as surface runoff from a site highly contaminated with Pb. Rates of Pb accumulation in beads under field conditions appeared to be correlated with the frequency of storm events and total rainfall. The rock phosphate agarose bead approach could be an inexpensive way to carry out source-tracking of Pb pollution, to verify the successful remediation of sites with Pb-contaminated soil, and to routinely monitor public water systems for potential Pb contamination. |
| Databáze: | OpenAIRE |
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