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    Item type:Research Data, Access status: with files ,
    M02.001 CHNS - elemental analysis
    (2019-02-06)
    Diedrich, Helmut
    ;
    Stahl, Alina
    This method describes the determination of nitrogen, hydrogen, sulfur and total carbon (TC) in homogenised solid samples such as dried sludge, soil, biological waste or sediments, containing more than 1 g analyte per kg of dry matter (0.1% w/w). Therefore, samples are weighed and analysed by NCHS analyser with internal thermal conductivity detector (TCD). The additional treatment of the samples with hydrochloric acid and thus, the removal of total inorganic carbon (TIC), allows the calculation of total organic carbon (TOC). The concentration of analytes in samples is quantified with an internal calibration (by peak area) and results are reported in g/kg.
    Data Type: Text
      442  251
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    Item type:Research Data, Access status: with files ,
    M02.005 Determination of the loss of ignitation of dry mass at 550°C
    (2018-08-14)
    Millfahrt, Tanja
    ;
    Klatt, Volker
    ;
    Stahl, Alina
    This method describes the determination of the loss of ignition (LOI) or the residue of ignition, respectively, of dry mass at 550°C. The LOI can be calculated from the difference of masses before and after the annealing process. The dry matter has been determined in accordance with method M02.008. The LOI or the residue of ignition is reported as percent of dry mass.
    Data Type: Text
      366  196
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    Item type:Research Data, Access status: with files ,
    M02.009 Determination of ash content of solid mineral fuels
    (2018-06-28)
    Millfahrt, Tanja
    ;
    Klatt, Volker
    ;
    Stahl, Alina
    This method describes the determination of the ash content of solid mineral fuels. A previously dried sample (see also method 02.008) is gradually heated up to 815 ±10°C in absence of air to constant weight. Charcoal and charcoal briquettes are heated up to 710 ±15°C. The ash content can be calculated from the difference of masses before and after annealing and is reported as percent of dry mass.
    Data Type: Text
      283  152
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    Item type:Research Data, Access status: with files ,
    M03.005 Qualitative and quantitative determination of saponins by LC-MSTOF and LC-MS/MS
    (2018-01-23)
    Stahl, Alina
    ;
    Frerichs, Heike
    Mit der vorliegenden Methode können die Ginsenoside Panaxatriol, Panaxadiol, Rb1, Rd, Rg3, Rh2, Compound K und F2, sowie die beiden Sojasaponine Aa und Bb in enzymatisch behandelten Soja- oder Ginsengextrakten quantitativ erfasst werden. Die quantitative Messung verschiedener Saponine (aktuell z.B. Rg1, Rb1, Panaxatriol und Panaxadiol) erfolgt mittels LC-MSMS (Sciex Qtrap 5500) mit einer Luna C18-Säule in positiver und negativer Polarität (gleichzeitig). Die Auswertung erfolgt über eine externe Kalibrierung mit Integration der Peakfläche. Sollen andere Saponin-Abbauprodukte qualitativ bestimmt werden, kann die Probe auch mittels LC-MSTOF mit reduzierter Empfindlichkeit gemessen werden.
    Data Type: Text
      368  248
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    Item type:Research Data, Access status: with files ,
    M02.006 Quantitative photometric determination of iron after derivatisation
    (2017-11-27)
    Fütterer, Cordula
    ;
    Stahl, Alina
    Determination of Fe (II) is carried out by means of 1,10-phenanthroline taking advantage of the fact that Fe (II) forms a water soluble red complex with 1,10-phenanthroline. The intensity of the coloured species is measured by a photometer. The concentration in samples is quantified with an external calibration and results are reported in mg/l.
    Data Type: Text
      184  457
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    Item type:Research Data, Access status: with files ,
    M03.010 Determination of anions in aqueous samples by ion chromatography
    (2017-11-27)
    Carstens, Jörg
    ;
    Romann, Eike Merten
    ;
    Stahl, Alina
    Anions such as chloride, nitrate, phosphate, sulfate, fluoride, nitrite, bromide and sulfite in aqueous samples are determined through ion chromatography by using an anion exchange column and a carbonate eluent. Quantification is performed by comparison of peak areas in standards and samples.
    Data Type: Text
      268  188
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    Item type:Research Data, Access status: with files ,
    M02.010 Determination of settleable matter
    (2017-10-02)
    Millfahrt, Tanja
    ;
    Stahl, Alina
    This method describes the determination of settleable matter by volume in water and waste water (see DIN 38409-9).
    Data Type: Text
      222  133
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    Item type:Research Data, Access status: with files ,
    M02.008 Determination of dry residue in solid samples
    (2017-07-21)
    Millfahrt, Tanja
    ;
    Stahl, Alina
    This method describes the calculation of dry matter by determination of dry residue. Therefore, solid samples such as sludge, soil, sediment or biological waste are thoroughly homogenised and dried at 105 ± 3°C to constant weight. The residue is then weighed and the result is reported in percent or g/kg.
    Data Type: Text
      190  136
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    Item type:Research Data, Access status: with files ,
    M02.004 Quantitative determination of mercury in aqueous samples by atomic absorption spectroscopy
    (2017-04-18)
    Fütterer, Cordula
    ;
    Stahl, Alina
    Determination of mercury(I) and (II) in different types of water such as potable water, surface water, rainwater and wastewater is carried out by means of a flow injection mercury system (FIMS) which uses atomic absorption as detection (AA). To oxidize the mercury in its divalent form, aqueous samples are treated with KBr- KBrO3. After that, tin(II) chloride reduces Hg2+ to elementary mercury. This elementary mercury can be analysed by FIMS at the wavelength of 253,7 nm. The concentration in samples is quantified with an external calibration and results are reported in µg/L or mg/L.
    Data Type: Text
      160  129
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    Item type:Research Data, Access status: with files ,
    M02.003 Quantitative determination of mercury in solid samples by atomic absorption spectroscopy
    (2017-04-18)
    Fütterer, Cordula
    ;
    Stahl, Alina
    Determination of mercury(I) and (II) in solid samples such as soil, sludge or sediment is carried out by means of a flow injection mercury system (FIMS) which uses atomic absorption as detection (AA). After digesting and the solid samples, tin(II) chloride reduces Hg2+ to elementary mercury. This elementary mercury can be analysed by FIMS at the wavelength of 253,7 nm. The concentration in samples is quantified with an external calibration and results are reported in µg/kg or mg/kg.
    Data Type: Text
      167  117