Analytical examination

In general, many of the analytes examined in this study can be isolated by using alternate methods such as purge and trap, liquid-liquid... 

It is, after all, comparatively a narrow range of products of chemical arts that, through their analytical examination, can give us evidence as to the materials and, in-ferentially sometimes, as to the processes in use before any literary remains from ancient times are to bo found. From such few ancient writings as touch upon the arts and manufactures in comprehensible detail, and which have survived the destruction of time, we may learn much that is more specific regarding the chemical knowledge of the ancients. 

Jpor several years, studies regarding the behavior of lignin on acidolysis, —i.e., heating with 0.2M hydrogen chloride in dioxane-water 9 1— have been carried out in our laboratory. Analytical examination of the changes incurred by this treatment, and more recently, the isolation of various degradation products helped to elucidate some basic structural features of the lignin molecule. 

The following time series analytical examinations will only deal with the time series at the feeder stream gauge at Lawitz and the drinking water reservoir at Weida. This is the only point of interest for practical conclusions in relation to the supply of humans with drinking water. 

Recent decades have witnessed a sharply growing demand for information. This also pertains to information obtainable from the analytical examination of samples of material objects. 

Russian researchers [70] have found that in glass tubes the same Ku value is obtained at Bd > 6. This discrepancy caused Eichhom [71] to carry out a detailed dimensional-analytical examination. He first discovered that the lower critical vG corresponded to a critical film thickness and to a critical shear rate in the phase boundary G/L. Therefore, there are three parameters independent of each other, which could be regarded as target quantities. However, vG can be measured more accurately and more easily than the others, therefore, it is accepted as the target quantity. 

Calibration is necessary because the quantity (content, concentration) of a given component in a sample cannot be found directly, but only through the signals produced by the measurement instruments dedicated to analytical examination of this component. Under well-defined chemical and instmmental conditions, a definite relationship (calibration dependence) between the analytical signal and the concentration of a component (analyte) exists. The crucial point of calibration is to define this dependence and exploit it for determination of analyte in a sample. 

The products listed in the two last groups have to pass an analytical examination in the special section of the Drug Institute and obtain a free sale certificate before being eligible for marketing. 

The mechanism was discussed based on extensive analytical examinations [27,29], Not only are polyamide residues observed on the TPU fracture surface, TPU residues are also detected on the polyamide surface after removal of the soluble TPU residues by DMA (Fig. 14). The presence of insoluble or connected TPU residues can only be explained by chemical bonds. 

Such method allows generating low and stable concentrations of agent for a long time that will complicate subsequent chemical and analytical examination during investigative actions. Therefore, to accumulate the necessary dose of poison there required considerable period of time. It was proved by slow development of clinical signs of intoxication. Injured people as we can see from the letter had a time to feel ill and to go to a hospital. 

With liquid crystal metal phthalocyanine compounds as mass sensors, the LSER approach has proven useful. Analyte uptake has been measured using QCM methods, and adsorption of volatile organic compounds (VOCs) into the liquid crystalline coating appears to follow similar trends as for organic polymer film sensors. It should be noted that the analytes examined (toluene, chloroform, carbon tetrachloride, benzene, hexane, and methanol) are volatile compounds that are very weak ligands toward metals [167], Thus, the composite sensor response for metal phthalocyanine sensors based on conductivity is a complex property that depends on analyte redox properties, basicity, and sensor crystallinity. 

Haslam J, Soppet W, Willis HA (1951) Analytical examination of plasticizers obtained from PVC compositions. JAppl Chem 1, 112-124. 

Schuller, D., C.J. Drews, and H.P. Harke Analytische Untersuchungen an Gasphasenkondensat [Analytical examination of the gas phase of cigarette smoke] Beitr. Tabakforsch. 6 (1971) 84-88. 

The analytical examination of the test media after the end of the galvanic corrosion experiments involved determining the concentrations of iron, copper and zinc. The concentration of zinc was measured because some of the specimens tested had been coated with a zinc-rich primer. 

A first indication of such a situation is obtained if the precalculated adiabatic temperature increase, derived fi om the gross heat of reaction measured imder normal operating conditions, is by far exceeded in the adiabatic experiment. An analytical examination of the final reaction mixture will provide the final proof. 

The exudation test consists in freezing and thawing the gelatine three times in sueeession. Under these conditions there should be no exudation of nitro-glycerine. All the materials used in the manufacture of gelatine explosives should be subjected to analytical examination before use, as sueeess largely depends upon the purity of the raw materials. The wood-pulp, for instanee, must be examined for aeidity. 

A complete analytical examination of the role of distribution of the flow velocity over the radius of a tube is obviously impossible. A formulated problem for a complete description of the flow of rheokinetic liquid seems to be quite difficult and it is clear that the first steps in investigating a two-dimensional flow were based on very simple assumptions. In a number of works [43,44], the authors took a fixed parabolic profile which is incorrect in principle for the flow of polymerizing media and leads to important mistakes. This is demonstrated very well in Ref. [45] where the possibility for styrene polymerization in a tubular reactor has been estimated it hse been shown that, if a real distribution of flow velocities and residence times over the radius is taken into account, the answer must be negative, in Ref. [44] however, a positive answer is obtained for an a priori parabolic profile. 

A primary requirement in all solvation studies is the analytical examination of the solvent and the solute. Since water, owing to its amphoteric nature, behaves as a base in acidic solvents and as an acid in basic solvents, strongly solvating both Lewis acids and Lewis bases as a consequence of its ability to donate an electron pair and to form hydrogen bonds, the first and perhaps the most important task of the analyst is to determine the moisture contents of the solvent, of the components to be dissolved, and finally of the solution. This is followed by the detection, and if necessary the determination, of any possible decomposition products of the solvent. 

Now that we have completed this analytical examination of the enzymes involved in fatty acid oxidation, it is possible to take a synthetic view of the pathway as it is outlined in Fig. 1-23. On examination of that figure, it is obvious that two metabolites—ATP and oxaloacetate—provided by the Krebs cycle, are needed for proper functioning of the fatty acid oxidation pathway. ATP is required in the thiokinase reaction where the free energy of the pyrophosphate is used to activate the fatty acid, and oxaloacetate escorts acetyl-CoA through the Krebs cycle. 

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