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Full-Text Articles in Chemistry
Empirical Model For The Variarion In Concentration Of Metal Ions During A Precipitation Event, David M. Chittenden Ii, Julie D. Chittenden
Empirical Model For The Variarion In Concentration Of Metal Ions During A Precipitation Event, David M. Chittenden Ii, Julie D. Chittenden
Journal of the Arkansas Academy of Science
The concentration of a pollutant in an air mass and the concentration of that pollutant in a series of rain water samples from a single event within that air mass, fluctuate during the course of the event. This the result of scavenging, diffusion, and advection processes. A simple mathematical model, containing only a scavenging term has had limited success in describing changes of concentration in rain water. To date, no attempt has been made to include diffusion or advection terms in the model. In this study, a two factor model was developed after determining that (1) the exponential scavenging term …
Moisture Determination By Thermal Titrimetry Using The Enthalpy Of Reaction Of 2,2-Dimethoxypropane With Water, Edmond W. Wilson Jr., Reagan Baber
Moisture Determination By Thermal Titrimetry Using The Enthalpy Of Reaction Of 2,2-Dimethoxypropane With Water, Edmond W. Wilson Jr., Reagan Baber
Journal of the Arkansas Academy of Science
Assays for water content can be readily and simply carried out using the technique of thermal titrations. The method is based on measuring the endothermic heat of reaction exhibited when 2,2-dimethoxypropane is brought into contact with water in the presence of an acid catalyst. The apparatus is simple, requiring a constant delivery rate buret, a recording thermistor thermometer, and a stirred, thermally insulated reaction container. The 2,2-dimethoxypropane reagent used for the water assays is environmentally friendly ("green"). It is stable, pleasant smelling and economical. Working curves in three solvents, acetonitrile, tetrahydrofuran and 1,4-dioxane, show excellent precision and linearity with increasing …
Thermal Decomposition Studies Of Selected Transition Metal Polysulfide Complexes. Ii. Effect Of Atmosphere On Decomposition, Benjamin Rougeau, Mark Draganjac
Thermal Decomposition Studies Of Selected Transition Metal Polysulfide Complexes. Ii. Effect Of Atmosphere On Decomposition, Benjamin Rougeau, Mark Draganjac
Journal of the Arkansas Academy of Science
Initial studies involved the thermal decomposition profile of five polysulfide complexes in air up to 550 °C. Since our first report to the Academy in 1990, we have obtained the capability to run samples up to 1500°C under various gases. Thermal Gravimetric Analysis (TGA) and Differential Thermal Analysis (DTA)of a series of transition metal polysulfide complexes are presented. Compounds analyzed included Cp2TiS5 ,MoS9 2",MoOS8 2", Zn(S x ) 2", Cd(S x ) 2-, Fe2S122 - and NiS82.
Anomalous Concentrations Of Co-58 And Cs-137 In Dardanelle Reservoir, David M. Chittenden Ii
Anomalous Concentrations Of Co-58 And Cs-137 In Dardanelle Reservoir, David M. Chittenden Ii
Journal of the Arkansas Academy of Science
The unforseen occurrence of significant concentrations of Co-58 and Cs-1 37 in a quiescent backwater of Dardanelle Reservoir provided an opportunity to observe the equilibrium distribution of Cs-1 37 between solution and suspended solids. This equilibrium has not been observed in other areas of the reservoir because small amounts of this nuclide are regularly injected into the lake by the AP&L Nuclear I facility. The systematics of the Co-58 concentration lead to the conclusion that significant amounts of these two nuclides had been injected into the sampling area from a source unknown.
Concentrations Of Total Dissolved Solids And Selected Cations In Dardanelle Lake, Arkansas, David M. Chittenden Ii
Concentrations Of Total Dissolved Solids And Selected Cations In Dardanelle Lake, Arkansas, David M. Chittenden Ii
Journal of the Arkansas Academy of Science
No abstract provided.
Factors Affecting The Sr-90 Concentration In Dardanelle Lake, Arkansas, David M. Chittenden Ii
Factors Affecting The Sr-90 Concentration In Dardanelle Lake, Arkansas, David M. Chittenden Ii
Journal of the Arkansas Academy of Science
No abstract provided.