An ion imprinted polymer for the selective extraction of mercury (II) ions in aqueous media
- Authors: Batlokwa, Bareki Shima
- Date: 2010 , 2013-07-18
- Subjects: Mercury , Metal ions , Imprinted polymers , Polymerization
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4294 , http://hdl.handle.net/10962/d1004541 , Mercury , Metal ions , Imprinted polymers , Polymerization
- Description: This thesis presents the application of an imprinted mercury(lI) polymer that we synthesized by copolymerizing the functional and cross-linking monomers, N'-[3-(Trimethoxysilyl)propyl] diethylenetriamine (TPET) and tetraethylorthosilicate (TEOS) in the presence of mercury (II) ions as template. A bulk polymerization method following a double-imprinting procedure and employing hexadecyltrimethylammonium bromide (CTAB), as a second template to improve the efficiency of the polymer was employed in the synthesis. The imprinted polymer particles were characterized by Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM) and their average size determined by screen analysis using standard test sieves. The relative selective coefficients (k') of the imprinted polymer evaluated from selective binding studies between Hg ²⁺and Cu²⁺ or Hg²⁺ and Cd²⁺, were 10588 and 3147, respectively. These values indicated highly favored Hg²⁺ extractions over the two competing ions. Application of the polymer to various real water samples (tap, sea, river, pulverized coal solution, treated and untreated sewerage from the vicinity of Grahamstown in South Africa) showed high extraction efficiencies (EEs) of Hg²⁺ ions; (over 84% in all cases) as evaluated from the detected unextracted Hg²⁺ ions by inductively coupled plasma optical emission spectroscopy (ICP-OES). The limit of detection (LOD, 3ơ) of the method was evaluated to be 0.036 ng ml⁻¹ and generally the data (n=10) had percentage relative standard deviation (%RSD) of less than 4%. These findings indicate that the double-imprinted polymer has potential to be used as an efficient extraction material for the selective pre-concentration of mercury(lI) ions in aqueous environments. , KMBT_363 , Adobe Acrobat 9.54 Paper Capture Plug-in
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- Date Issued: 2010
Africa‘s Heritage No. 6: The blues
- Authors: Tracey, Hugh
- Subjects: Allan Lomax , American Folk , Wailing Wall , Blame , Blues , Penny whistle , Johannesburg , Swazi , The Cool Brothers , Folk music , Cape Town , Coon Carnival , Kaapse Klopse , Vitality , Banjo , Delinquency , Instruments , Concertina , Eastern Cape , Transkei , Ciskei , Harmonica , Forest City Joe , Mouth organ , Arkansas , Mississippi Valley , Steven Tsotsi , The Vagabond , Country blues , Civil War , Slaves , Follow The Drinking Gourd , The Great Bear , The Big Dipper , Constellation , The Wayfarers Trio , Slave song , The Hammer Song , Prison , Uganda , Heritage , Malimba , Likembe , Roots of the Blues , Oree , Swazi Penny Whistle , Isicatula , Blues roll on , Sittin‘ on top of the world , Marita , Tsotsi , Blue and Grey , Mercury , Alur tune , Pete Seeger
- Language: English
- Type: Sound , Radio broadcast , Music
- Identifier: vital:15102 , http://hdl.handle.net/10962/d1008530 , Reel number: BC132
- Description: 6th programme in the ‘Africa‘s Heritage‘ Series with African music in America and Africa, broadcast by the South African Broadcasting Corporation , For further details refer to the ILAM Document Collection: Hugh Tracey Broadcasts
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