Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 14 of 14 for “"standard addition"”.
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Quantitative Analysis by Room-Temperature Phosphorescence
… pharmaceutical preparations. A combination of standard addition and internal standard techniques along with sophisticated instrumental and mathematical techniques were developed to improve the precision and accuracy of the RTP methods.
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METHOD DEVELOPMENT OF STANDARD DILUTION ANALYSIS ON MOLECULES AND DISSOLUTION STUDIES OF IBUPROFEN TABLETS ALONG WITH COMMON BEVERAGE CONSTITUENTS
<p>The United States Pharmacopeia sets the standards for the manufacturing, storage, and analysis of medicinal formulations. One analysis, dissolution testing evaluates the rate at which the medicinal formulation forms a solution to predict <em>in vivo</em> drug release. Dissolution testing on …
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The separation and determination of rare earths in phosphate deposits from the north of the kingdom of Saudi Arabia
… by internal checks on some samples using standard addition. In general, the recovery of individual rare earth elements is high but these vary from sample to sample depending on the sample composition.
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Greenhouse Gas Production and Nutrient Reductions in Denitrifying Bioreactors
… experiment supported the hypothesis that the addition of biochar, a charcoal-like soil amendment and novel organic carbon source in DNBR research, would increase nitrate and phosphorus removal as well as decrease the accumulation of nitrous oxide, an intermediate product of microbial …
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Determination of Select Metal Ions in Commercially Available Conventional and Organic Baby Foods.
… atomic absorption spectroscopy with the regular standard calibration curve and standard addition method. There was little overall difference in metal content between the conventional and organic foods tested.</p>
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Extraction of alcohols from gasoline using solid phase microextraction (SPME)
… of EtOH in gasoline: the method of a standard calibration curve, and the method of standard addition. They are both successful in quantifying the amount of EtOH in gasoline. The relative errors, with the method of standard addition, vary from 5.3% to 14%, while the ones with the method …
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Thermobarometry of Hawaiian Spinel Peridotites
… separates from Hawaiian peridotites obtained by standard addition HR-ICP-MS to determine the depth at which these peridotites last equilibrated, and test the depth vs. depletion hypothesis. Together with new olivine major and trace element data, combined with preexisting clinopyroxene (cpx) and …
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Detection and quantification of sub-micromolar concentrations of aqueous anions using infrared spectroscopy and mass spectrometry
… persist in the environment. Two ESIMS methods, standard addition and direct-injection, are presented for the quantification of aqueous PFAS– anions, specifically perfluoro-noctanesulfonate (PFOS–). A concentration of 0.6 ± 0.1 μM PFOS– was quantified in groundwater from a well at a fire-training …
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Monitoring Metal Containing Particulates Distribution on a College Campus Using Dandelion (<em>Taraxacum officinale</em>) Leaves as Receptors.
… atomic absorption spectrometry using the regular standard calibration curve and also the standard addition method. From the results obtained, and the careful log of the weather and human activities at the different sites, it is concluded that human activities played a major role in the …
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METHOD DEVELOPMENT FOR THE ANALYSIS OF PROTEINS AND SMALL
… and sucrose. The method was subjected to standard addition validation and was shown to provide precise and accurate measurement of all three analytes in real samples.
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Studies on the analytical chemistry of chromium in aqueous solutions
… model solutions. To overcome this problem, the standard addition method has been used. The total chromium concentration in the model solution can be directly determined by graphite furnace atomic absorption spectrometry since the technique has the same sensitivity for both oxidation states of …
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Flavor Chemistry of Regional Hops (Humulus lupulus L.) and Novel Aroma Application of Hop-derived Products
… used with stable isotope dilution analysis and standard addition method for accurate quantitation of aroma-active compounds. A total of 33 and 36 aroma-active compounds were identified in all fresh and dried hops, respectively. Geraniol, β-myrcene, linalool, methyl octanoate and …
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THE DETERMINATION OF COPPER IN SEA WATER USING FLOW INJECTION WITH CHEMILUMINESCENCE DETECTION
… clean-up techniques, blank procedures and a standard addition protocol are detailed. The optimised method is selective for Cu(II) in the linear range 0.1 - 50 nM, with precision of <4% (n=4) for a typical seawater analysis, and a limit of detection (3s) of 25 pM for a loading time of 90 s. …
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Perfluorooctanoic Acid (PFOA) and Perfluorooctane Sulfonate (PFOS) in an Aquatic Ecosystem - Distribution and Fate
… of ionisation suppression, isotope dilution or standard addition method was applied. Analysis of waste waters collected from four different waste water treatment plants (WWTPs) located in Upper Franconia, Bavaria, Germany, showed that the largest plant (Bayreuth) receiving waste waters of mostly …