EFfects of pH on heavy metal sorption on mineral apatite

Article Abstract:

The metal sorption mechanism by mineral apatite and metal-apatite reaction products can be greatly influenced by the pH condition of heavy metal solutions. This was gleaned from an investigation of the sorption of aqueous Pb, Cd and Zn onto a mineral apatite from North Carolina in relation to a wide range of pH. Of particular concern were the effects of pH on solid-phase precipitation. Results proved the importance of alternative sorption mechanisms other than precipitation of the crystalline phases in reducing Cd and Zn concentrations. It was found that removal of Cd and Zn was pH dependent, while removal of Pb was not.

Analysis, Hydrogen-ion concentration, Heavy metals, Apatite, Apatites

---

Iodide retention by metal sulfide surfaces: cinnabar and chalcocite

Article Abstract:

Iodide is a component of radioactive waste and it is easily transported into the biosphere. To determine the mechanism by which this material enters the atmosphere, iodide sorption experiments were performed, with cinnabar and chalcocite as the sorbents of iodide. Potentiometric titrations indicated that iodide sorbs strongly to both cinnabar and chalcocite, particularly between pH 4 and pH 5. The sorption behavior of iodide was attributed to exchange by hydroxyls attached to metal surface sites on cinnabar and chalcocite.

Environmental aspects, Radioactive wastes, Iodides, Sulfide minerals

---

Similar abstracts:

• Abstracts: Effects of nonlinear sorption on the diffusion of benzene and dichloromethane from two air-dry soils. Static and dynamic headspace analysis of volatile organic compounds in soils
• Abstracts: Unified constitutive equations of foam materials. Characterization of multiaxial constitutive properties of rubbery polymers
• Abstracts: At last - the crystal structure of urease. Lipid-regulated kinases: some common themes at last. Evolutionary chemistry: getting there from here
• Abstracts: Water absorption by organics: survey of laboratory evidence and evaluation of UNIFAC for estimating water activity
• Abstracts: An experimental investigation into the relationship between temperature-time history and surface roughness in the spray quenching of aluminum parts

This website is not affiliated with document authors or copyright owners. This page is provided for informational purposes only. Unintentional errors are possible.