Tea-industry waste activated carbon, as a novel adsorbent, for separation, preconcentration and speciation of chromium.
Summary of "Tea-industry waste activated carbon, as a novel adsorbent, for separation, preconcentration and speciation of chromium."
Activated carbon was produced from tea-industry wastes (TIWAC) and employed as a low cost and effective solid phase material for the separation, preconcentration and speciation of chromium species without using a complexing agent, prior to determination by flame atomic absorption spectrometry (FAAS). The characterization of TIWAC was performed by utilizing several techniques such as Fourier Transform Infrared (FTIR) Spectroscopy, Scanning Electron Microscopy (SEM), and elemental analysis. The adsorption experiments were conducted in a batch adsorption technique. Under the experimental conditions, Cr(VI) adsorption amount was nearly equal to zero, however the adsorption percentage of Cr(III) was in the range of 95-100%. Therefore total chromium was determined after the reduction of Cr(VI) to Cr(III) and Cr(VI) was calculated by subtracting Cr(III) concentration from total chromium concentration. The suitable conditions for adsorption and speciation processes were evaluated in terms of pH, eluent type and volume, TIWAC concentration, adsorption and desorption contact time, etc. Adsorption capacity of TIWAC was found to be 61.0mgg(-1). The detection limit for Cr(III) was found to be 0.27μgL(-1) and the preconcentration factor was 50 for 200mL of sample volume. The procedure was applied to the determination and speciation of chromium in stream, tap and sea water. Also, the proposed method was applied to total chromium preconcentration in microwave digested tobacco and dried eggplant samples with satisfactory results. The method was validated by analyzing certified reference materials (CRM-TMDW-500 Drinking Water and CRM-SA-C Sandy Soil C) and the results were in good agreement with the certified values.
Affiliation
Department of Chemistry, Faculty of Sciences, Karadeniz Technical University, 61080 Trabzon, Turkey.
Journal Details
This article was published in the following journal.
Name: Analytica chimica acta
ISSN: 1873-4324
Pages: 75-83
Links
- PubMed Source: http://www.ncbi.nlm.nih.gov/pubmed/21296208
- DOI: http://dx.doi.org/10.1016/j.aca.2010.12.029
Medical and Biotech [MESH] Definitions
Radioactive Waste
Liquid, solid, or gaseous waste resulting from mining of radioactive ore, production of reactor fuel materials, reactor operation, processing of irradiated reactor fuels, and related operations, and from use of radioactive materials in research, industry, and medicine. (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)
Hazardous Waste
Waste products which, upon release into the atmosphere, water or soil, cause health risks to humans or animals through skin contact, inhalation or ingestion. Hazardous waste sites which contain hazardous waste substances go here.
Industry
The aggregate of manufacturing or technically productive enterprises in a particular field, often named after its principle product, as "the automobile industry", "the steel industry". It includes the ownership and management of companies, factories, industrial plants, etc. (From Random House Unabridged Dictionary, 2d ed)
Medical Waste Disposal
Management, removal, and elimination of biologic, infectious, pathologic, and dental waste. The concept includes blood, mucus, tissue removed at surgery or autopsy, soiled surgical dressings, and other materials requiring special control and handling. Disposal may take place where the waste is generated or elsewhere.
Waste Disposal, Fluid
The discarding or destroying of liquid waste products or their transformation into something useful or innocuous.
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