Hydrocarbon test

Hologenated hydrocarbons 100/a n-Hexane 100/a Hydrazine 0.25/a Hydrocarbon 0.1 %/b Hydrocarbon 2 Hydrocarbon test Hydrochloric acid 1/a... 

Figure 4.4 Separation of SRM 1647 and SRH 869 polycyclic aromatic hydrocarbon test mixtures on a monomeric and polymeric reversed-phase octadecylsiloxane bonded phases by gradient elution. (Reproduced with permission from ref. 69. Copyright American Chemical Society).

Hydrocarbon Testing Laboratories (including Oil or Water Testing, Darkrooms, etc.)... 

Specific contaminants that are components of total petroleum hydrocarbons, such as BTEX (benzene, toluene, ethylbenzene, and xylene), n-hexane, jet fuels, fuel oils, and mineral-based crankcase oil have been studied and a number of toxicological profiles have been developed on individual constituents and petroleum products. However, the character of the total petroleum hydrocarbons has not been studied extensively and no profiles have been developed. Although several toxicological profiles have been developed for petroleum products and for specific chemicals found in petroleum, the total petroleum hydrocarbon test results have been too nonspecific to be of real value in the assessment of its potential health effects. 

EPA. 1982a. Chlorinated hydrocarbons. Test method - method 612. Cincinnati, OH U.S. Environmental Protection Agency, Environmental Monitoring Systems Laboratory. 

Studying the action of sulfur on hydrocarbons, Teste and Lozach - showed that sulfur and PjSj with 2,5-dimethyl-3-hexyne-2,5-diol resulted in the formation of 2,5-diraethylthieno[3,2-6]thiophene (19) (R = Me, R = H) in very low yields, while with 3,6-dimethyl-oct-4-yne-3,6-diol they gave 2,3,5,6-tetramethylthieno[3,2-Z>]thiophene (19) (R = R = Me) [Eq. (4)]. 

Table I. Physical Constants of Hydrocarbons Tested for Nematocidal Efficacy...

The concentration of nitromethane in automobile exhaust using nine hydrocarbon test fuels under simulated driving conditions ranged from < 0.8 to 5.0 ppm (Seizinger Dimitriades, 1972). 

This sensor did not respond to the selected compounds as predicted, and in the first appraisal of data no significant relationship was found for the set of hydrocarbons tested. The biosensor response could be better explained for the set of aromatic hydrocarbons, insofar as these were more similar to isopropylbenzene. The data were remodeled, resulting in an improved regression model ... 

Fluorine is also used commercially as an additive in hydrotreating catalysts. Fluorine is added especially to hydrocracking catalysts because it increases the acidity of the catalyst and thus promotes acid-catalyzed cracking of hydrocarbons. Test reactions, such as the cracking of cumene to give benzene and propene, have demonstrated clearly that fluorine rather than... 

Table XI reveals many interesting features of the Chebyshev expansion common to all deuterium-for-protium substitutions in all the hydrocarbons tested at room temperature where Umax is about 15 or higher. In...

Because the hydrocarbon test samples were provided as solutions and were prepared from only one stock solution, a test of homogeneity was not necessary. A subset... 

EPA method 3560, Supercritical Fluid Extraction of Total Recoverable Petroleum Hydrocarbons, Test Methods for Evaluating Solid Waste, EPA, Washington D.C., 1996. 

Several measurements with toluene and the results for other aromatics indicated that the relative solubilities of the four aromatic hydrocarbons tested were as follows ... 

For other reactions, there may be a large increase in total moles, as in the cracking of hydrocarbons. Test data for thermal cracking of n-hexa-decane show 3 to 5 moles of product formed for each mole cracked [1] ... 

Acetone is the most active reductant for NO selective reduction over 5%Cu-2% Ag/C among the hydrocarbons tested. It is believed that the partial oxidation of acetone contributes to the reduction of NO in the presence of O2 and minimizes the reaction deactivation caused by carbon consumption with O2 at the same time. Acetone,... 

ISO 5275-79. Aromatic hydrocarbons - Test for presence of mercaptans (thiols) - Doctor test. 

The chromatogram of a C -Ce hydrocarbon test mixture on an ALOT column with alumina is shown in Fig. 6-12 [55]. Fig. 6-13 and Fig. 6-14 show chromatograms of hydrocarbon test mixtures obtained with alumina capillaries additionally coated with squalane (Fig. 6-13) or polyethylene glycol (Fig. 6-14) [55]. The use of modified alumina allowed the range of analyzed mixtures to be broadened and the column temperature to be lowered. 

Charactyistiy of Surface Reactions. In general, the re-activities of the feed hydrocarbons tested in reduced metallic reactors were in the following order ... 

To assess the performance of the optimized basis sets for unsaturated hydrocarbons, test calculations were carried out at the DFT level. For reference, the energies obtained with Dunning s cc-pVTZ basis set were used. The energies are collected in Table 4, while the number of functions in the various basis sets is presented in Table 5. 

For petroleum hydrocarbon mixtures of bromine number less than 1.0, a more precise measure for bromine-reactive constituents can be ol ned by using Test Method D 2710. If the bromine number is less than O.S, then Test Method D 2710 or the comparable bromine index methods for industrial aromatic hydrocarbons. Test Method D 1492, must be used in accordance with their respective scopes. The practice of using a factor of 1000 to convert bromine number... 

Hydrocarbon Test Mixture—A quantitative synthetic mixture of pure hydrocarbons, an example of which is identified in Table 2 is used to tune the instrument analysis conditions and establish that the instrument is performing within specifications. Individual hydrocarbon components, in addition to those listed in Table 2, may be used to aid in the analysis. The concentration level of each component in the hydrocarbon test mixture is not critical as long as the concentration is accurately known. Percentage ranges of 1.0 to 6.0 mass % have been found suitable. Impurities in the individual components may have an adverse effect on the quantitative aspect of the analysis. If an impurity is of the same carbon number and basic molecular structure as the... 

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