Browsing by Author "Meckel, Lothar"

Now showing 1 - 4 of 4
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    Analytical investigation of dust, sludge and waste water specimens from the production facilities of a special glass manufacturer
    (Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft, 1989) Meckel, Lothar
    Waste materials obtained at the production of special glasses need to be investigated for their constituents quickly, precisely, and sufficiently sensitivly in order that they can be recycled as raw materials to the batch, or that appropriate disposal measures can be initiated. The solid specimens from the environment, such as dust and sludge, are decomposed using mineral acids or alkali melts, while the waste waters in most of the cases are decomposed by means of HNO3/H2O2. In the event of high concentrations the elements are determined by mensuration analysis, while in the case of low (< 100 mg/l) and trace (< 0.1 mg/l) concentrations, induced coupled plasma spectrometry, atomic spectrometry in absorption (flame, graphite tube, hydride, and cold-vapour atomic absorption spectrometry) and in emission, respectively, and solvent spectrophotometry are employed.
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    Determination of the composition of glass, glass-ceramics and glass raw materials with Laser-ICP-MS
    (Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft, 1999) Strubel, Christine; Meckel, Lothar; Effenberger, Ruth
    A mass-spectrometric method with an inductively coupled plasma as an ion source (ICP-MS) is presented which uses an excimer laser for direct ablation of solid material. The oxide compositions of a television screen glass, a glass-ceramic and a quartz powder analyzed by LA-ICP-MS are given and compared with data obtained by wet chemical analysis. Fundamental processes of the technique are described and advantages and disadvantages for the analysis of glass are discussed.
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    Photometrie determination of trace amounts of boron in glass and nitride based materials with curcumin - New approaches
    (Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft, 2004) Rohr, Udo; Meckel, Lothar
    A versatile method for the determination of boron in glass and nitride based ceramie materials is described. After digestion with sodium hydroxide, boron is extracted with 2-ethyl-l,3-hexanediol into chloroform. The extracted boron reacts with curcumin to a red complex, which is measured photometrieally. The working range of the method is 0.4 to 1200 μg boron per g. The determination limit (sixfold standard deviation) is 0.4 μg/g. The verification of the results for the developed analytical method with certified reference materials and DIN Standard method is excellent.
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    Recommended procedure for the chemical analysis of soda-lime-silica glasses and raw materials by atomic absorption spectrometry
    (Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft, 1987) Buchmayer, Peter; Hoffmann, Walter; Meckel, Lothar
    A rapid, simple and sufficiently accurate procedure is described for the determination of the oxide composition of glasses and glass raw materials by atomic absorption spectrometry (AAS) and the results are discussed with the help of collaborative analyses. The sample weights and the concentrations of the sample and reference soludons were chosen under the aspect of the lowest possible expenditure. In general, along with the blank solution, two reference solutions are sufficient. For the determination of chromium(III) oxide and titanium dioxide addidonal sample decomposidons, and for the determination of titanium dioxide, an additional reference solution, are required.