doi:10.1016/j.jhazmat.2007.10.019
Copyright © 2007 Elsevier B.V. All rights reserved.
Copyright © 2007 Elsevier B.V. All rights reserved.
Multi-component sorption of Pb(II), Cu(II) and Zn(II) onto low-cost mineral adsorbent
Determination of heavy metals in air particulate matter... Journal of Chromatography A |
Determination of heavy metals in air particulate matter by ion chromatography Journal of Chromatography A, Volume 739, Issues 1-2, 19 July 1996, Pages 233-239 A. Rahmalan, M. Zahari Abdullah, M. Marsin Sanagi, M. Rashid Abstract In recent years, ion chromatography has been increasingly used for the separation and determination of heavy metals. In this study, the separation of Cu2+, Ni2+, Zn2+, Co2+, Pb2+ and Fe2+ in airborne particulate samples was achieved by the use a complexing eluent containing 20 mM oxalic acid and 20 mM citric acid adjusted to pH 3.6 with lithium hydroxide. Upon elution, the separated metal ions were reacted with 4-(2-pyridylazo)resorcinol to form coloured complexes in a postcolumn reactor and detected by using a UV-Vis detector at 520 nm. The calibration graphs for the metal ions were linear in the range 1.0–3.0 μg/ml for Cu2+, Ni2+, Co2+ and Zn2+, 8.0–24.0 μg/ml for Pb2+ and 2.0–6.0 μg/ml for Fe2+. Detection limits for a 25-μl sample solution were 2.2, 0.9, 6.6, 0.9, 1.8 and 2.1 μg/l for Cu2+, Ni2+, Zn2+, Co2+, Pb2+ and Fe2+, respectively. The technique was optimized and validated by analysing the NIST standard reference materials SRM 1648 Urban Particulate Matter and SRM 1633b Coal Fly Ash. sk=992609998&view=c&wchp=dGLbVlW-zSkWA&md5=756131a84fd6325eaa9e01188153a789&ie=/sdarticle.pdf"> Purchase PDF (479 K) |
Removal of heavy metal ions from water by using calcine... Journal of Hazardous Materials |
Removal of heavy metal ions from water by using calcined phosphate as a new adsorbent Journal of Hazardous Materials, Volume 112, Issue 3, 30 August 2004, Pages 183-190 A. Aklil, M. Mouflih, S. Sebti Abstract Calcined phosphate (CP) has been employed in our laboratories as a heterogeneous catalyst in a variety of reactions. In this study, CP was evaluated as a new product for removal of heavy metals from aqueous solution. Removal of Pb2+, Cu2+, and Zn2+ on the CP was investigated in batch experiments. The kinetic of lead on CP adsorption efficiency and adsorption process were evaluated and analysed using the theories of Langmuir and Freundlich. The influence of pH was studied. The adsorption capacity obtained at pH 5 were 85.6, 29.8, and 20.6 mg g−1 for Pb2+, Cu2+ and Zn2+, respectively. We hypothesize at pH 2 and 3, the dissolution of CP and precipitation of a fluoropyromorphite for lead and the formation of solid-solution type fluorapatite for copper. The results obtained show that CP is a good adsorbent for these toxic heavy metals. The abundance of natural phosphate, its low price and non-aggressive nature towards the environment are advantage for its utilisation in point of view of wastewater and wastes clean up. sk=998879996&view=c&wchp=dGLbVlW-zSkWA&md5=a9a4fb823390daf1bf785c51c6a8519e&ie=/sdarticle.pdf"> Purchase PDF (154 K) |
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Multi-component sorption of Pb(II), Cu(II) and Zn(II) onto low-cost mineral adsorbent