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| TP-stab-biod |
Determination of the oxidative stability of biodiesel (fatty acid methyl esters, FAME) |
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| The poster describes the influence of method parameters such as temperature, sample size and gas flow on the determined induction time. |
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| TP-kf-biod |
Determining the water content in biodiesel by Karl Fischer titration as per EN ISO 12937 |
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| This poster describes the water determination in different biodiesel samples via direct coulometric titration, the Karl Fischer oven method and an automated KF pipetting system. |
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| TP-bro3-pcr |
Influence of pH, temperature and molybdate concentration on the performance of the triiodide method for the trace-level determination of bromate (EPA 326) |
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| This poster discusses results showing the influence of pH, temperature of the post-column reactor, eluent composition and iodide concentration on the sensitivity of the triiodide method. |
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| AN-S-241 |
Chloride and sulfate in ethanol used as biofuel (ASTM D 7319-07) |
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| Determination of chloride and sulfate in ethanol using anion chromatography with conductivity detection after chemical suppression. |
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| AN-S-235 |
Determination of anions and oxyhalides by US EPA method 300.1 A and B in a single analysis (standard solution) |
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| Determination of fluoride, chlorite, bromate, chloride, nitrite, dichloroacetate (surrogate), chlorate, bromide, nitrate, phosphate and sulfate according to US EPA 300.1 A and B using anion chromatography with conductivity detection after sequential suppression. |
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| AB-231 |
Voltammetric determination of zinc, cadmium, lead, copper, thallium, nickel and cobalt in water samples according to DIN 38406 Part 16 |
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| The standard method postulated by DIN 38406 Part 16 describes the determination of Zn, Cd, Pb, Cu, TI, Ni and Co in drinking, ground, surface and precipitation (e.g. rain) water. Because the presence of organic substances in the water samples can strongly interfere with the voltammetric determination, a pretreatment with UV digestion using hydrogen peroxide is necessary. This digestion ensures the elimination of all organic substances without introduction of blank values. These methods can, of course, also be applied for trace analysis in other materials, e.g. trace analysis in the production of semiconductor chips based on silicon. Zn, Cd, Pb, Cu and TI are determined on the HMDE by means of anodic stripping voltammetry (ASV), Ni and Co by means of adsorptive stripping voltammetry (AdSV). |
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| AB-080 |
Determination of the acid and base numbers in petroleum products |
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The determination of the acid or base number plays a significant part in the analysis of petroleum products. This is shown by the numerous standard procedures in use the world over (internal specifications of multinational companies, national and international specifications of ASTM, DIN, IP, ISO, etc.). These procedures differ mainly in the composition of the solvents and titrants used. Fortunately, the days of the work-intensive use of pH meters, glass burets and color indicators seem to be over. Modern titrators are gradually replacing time-consuming manual titrations as well as the calculation of the results. This Bulletin describes the determination of the acid and base number in petroleum products by means of automatic potentiometric titration. |
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| AB-050 |
Determination of lead in petroleum products by stripping voltammetry |
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The determination of the lead content in engine fuels has gained considerable importance since the introduction of the catalytic converter technique. Even small contents of lead interfere with the effectiveness of the catalysts or may destroy them. On the other hand, there are still many vehicles on the roads which run on leaded fuel (addition of tetraalkyl lead). Here also the knowledge of the lead content is of interest. With reference to DIN 51769 and ASTM 0-1269 a simplified procedure for the determination of lead in petrochemical products is described. The products are digested with HCl and the lead compounds are converted to lead(II) chloride. After extraction with water, the inverse voltammetric Pb determination is carried out. |
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| 8.000.6028EN |
Ultratrace determination of uranium(VI) in drinking water by adsorptive stripping voltammetry according to DIN 38406-17 |
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| A convenient adsorptive cathodic stripping voltammetric (AdCSV) method has been developed for trace determination of uranium(VI) in drinking water samples using chloranilic acid (CAA). The presence of various matrix components (KNO3, Cl–, Cu2+, organics) can impair the determination of the uranium-CAA complex. The interferences can be mitigated, however, by appropriate selection of the voltammetric parameters. While problematic water samples still allow uranium determination in the lower µg/L range, in slightly polluted tap water samples uranium can be determined down to the ng/L range, comparable to the determination by current ICP-MS methods. |
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| 8.000.6020EN |
Titrimetric analyses of biofuels |
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| Several testing methods such as the determination of the acid and the iodine numbers in biodiesel as well as the quantification of sulfate and chloride in bioethanol are described. |
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| 8.000.6020DE |
Titrimetric analyses of biofuels |
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| Several testing methods such as the determination of the acid and the iodine numbers in biodiesel as well as the quantification of sulfate and chloride in bioethanol are described. |
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| 8.000.6008EN |
Simple and innovative method for the determination of glycerol in biodiesel and biodiesel blends by ion chromatography. |
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The free and total content of detrimental glycerol in vegetable oil methyl esters (biodiesel) is of paramount importance for the quality of biodiesel and is therefore limited by the US ASTM D 6751 and the European EN 14214 standards. Both regulations currently stipulate gas chromatographic (GC) analysis of free and total glycerol. However, the GC method, apart from being expensive, requires tedious derivatizations and fails for glycerol determinations in coconut or palm kernel oil methyl esters.
In contrast, the presented ion chromatographic method can be applied to all types of vegetable oil methyl esters. Prior to chromatographic separation, free glycerol and bound glycerol are isolated by a straightforward extraction and saponification-extraction technique, respectively. Integrated pulsed amperometric detection following chromatographic separation achieves an outstanding method detection limit (MDL) of 0.7 ppm for free and total glycerol and thus easily exceeds ASTM and EN performance specifications. Spiked recovery rates for free and total glycerol are within 93…104% and 87…100%, respectively. |
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| 8.000.6007EN |
Determination of sulfate in denatured ethyl alcohol according to ASTM D 7319 |
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| In this poster a convenient direct injection suppressed ion chromatographic method for determining chloride and sulfate in denatured ethanol samples according to ASTM D 7319 is presented. |
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