Applied Chemistry

Ultrasonic velocity, density and viscosity for binary liquid mixture of fatty acid ester Ethyl Oleate with toluene have been measured at 2 MHz ultrasonic frequency within the temperature range of 303.15K to 318.15k. Thermo-acoustic parameters like adiabatic compressibility, acoustic impedance and intermolecular free length are calculated. The results are interpreted for interaction studies among the molecules of the mixtures.

Approximately 750,000 multi-family housing units experienced roofing problems due to fire-retardant-treated (FRT) plywood sheathing failure since 1985 until 1995. The problem is caused by excessive exposure to solar radiation. Plywood is not safe because it contains glue that may be toxic, harmful to life and human skin when exposed to ignition. The aims of this research built on modifying plywood to be fire resistant. Thus, the sol - gel technique was applied to prepare a new fire-retardant coating containing different volumes of H3PO4 (0, 0.3, 0.7, and 1.1 ml) to protect the plywood from ignition. The flammability properties of the different coated samples evaluated by the following measurements using standard methods: limiting oxygen index (LOI), ignitability and thermogra¬vimetric analysis (TGA). The results indicated that, the highest flame retardant LOI obtained at H3PO4 1.1ml reaching ? 150% relative to the un-treated; these results are supported through ignitability and thermogravimetric analysis.

A total of 14 different Petroleum samples comprising of 4 crude oil blends, 7 refined products and 3 wastes from the Tema oil refinery were analyzed for 27 elements using Instrumental Neutron Activation Analysis (INAA). Based on the results obtained and analytical procedure used in this work, pattern of occurrence of the metal contaminants in the petroleum products and waste suggest they are native to the crude oil and its origin as no external contamination was established. It was observed from the study and previous ones that the Brass and Bonny crude oil from Nigeria have low metal contents. However, despite the low concentrations, trace amounts of these metals could be deleterious in the refinery as they can cause corrosion, catalytic poisoning, and affect the quality of refined products. They could also contribute to environmental pollution as results of combustion of fuel products and hence should be reduced or removed.

: The equilibrium constants for metal complex formation have been employed from long as an effective measure and parameter of the affinity of a ligand for a metal ion in solution. PHmetry is one of the most convenient and successful technique employed for metal complex equilibrium measurements. pHmetric measurement of hydrogen ion concentration may be employed when the degree of complex formation is sensitive to the hydrogen ion concentration thus the degree of complex formation undergoes increase/ decrease with change in pH. In the present work, we investigate the stability constants of Paracetamol complexes with Co2+, Zn2+ and Cd2+pHmetrically using pH metric technique at three temperatures (25 ±0.1, 30 ±0.1 and 35± 0.10 C) and at an ionic strength of 0.1 mol L-1 (KNO3). The method of Calvin and Bjerrum as adopted by Irving and Rossotti has been employed to determine log K1 values. The thermodynamic parameters ?G, ?H and ?S are calculated. System tend to progress in the direction of increasing entropy as entropy is a measure of a system’s tendency towards spontaneous change. KEYWORDS: pH metry, Stability constant, Thermodynamic parameters, Entropy

We herein discuss TLC analyzer software (freeware) as an inexpensive tool for the analysis of astronomical images. Interestingly, recently developed TLC analyzer software has been used by the chemist for the quantitative chromatographic analysis of organic compounds. The high accuracy measurement software utilities for analysis of astronomical images have been too expensive for most of the schools and the colleges. However, this is the beginner’s spectrophotometer of its kind which makes elaboration even at pixel level of high resolution astronomical JPEG images. The TLC analyzer even has found to be more proficient with other image processing software such as ImageJ (public domain software), Spectra.

Drying is known as one of the oldest and best method for keeping the agricultural materials and food products. In process of drying, utilization of energy makes that drying seems an activity with the most consumption of energy. In this paper, kinetics of drying of banana pieces was carried out using Hybrid Dryer. In our experiments, dryer were regulated in velocities of air of 1, 1.5 and 2 m/s and temperatures of 60, 70 and 80?. Banana pieces were cut with thickness of 5 millimeter. In order to achieve the fit model in molding of kinetics of drying, it must be examine the models. Thus, in this research, 8 models were selected randomly to obtain the fit model. In evaluation of models, among the 8 models, Aghbashlo model was fit model. The model called fit model that it has highest value for R2 and lowest values for RMSE, and MBE in all of the experiments. Variation domain of energy of activation and diffusivity of moisture of effective were 6.52×10-9 to 9.20×10-9m2/s & 50.61 to 53.79 kJ/ mol., respectively.

Inhibition of copper corrosion by some thiazolidine derivatives in 1 M HNO3 was inspected by" WL (weight loss),(EIS) electrochemical impedance spectroscopy, (EFM) electrochemical frequency modulation and potentiodynamic polarization measurements". The inhibition effectiveness expanded by the expansion in the concentration of inhibitor and deceased when temperature increased. It is clearly that these mixes work as mixed type inhibitors and that was proven by Potentiodynamic polarization study. These inhibitors whose adsorption was found to comply Langmuir adsorption isotherm. When a number of unique strategies were in great understanding, the outcomes resulted. Relationships of quantum structure-movement have been utilized to examine the molecular structure impact on the inhibitors efficiency. The surface morphology of copper specimen was explored by scanning electron microscopy (SEM).

A new hydrazone Schiff base consisting of 7-chloro-4-(o-hydroxy benzilidenehydrazo) quinoline, with metal complexes of some divalent metal ions, Mn(II), Fe(III), Co(II), Ni(II), Cu(II), Zn(II), and Cd(II) were investigated Conduct metrically and thermodynamically. We have used molar ratio method to determine the stoichiometric of the formed complexes, The results obtained confirmed the formation of 1:1 and 1:2, M: L complexes. In order to get information about the composition of complexes electrical conductivity were determined. The standard thermodynamic parameters viz. ?G, ?H and ?S, for the proton-ligand and the stepwise metal-ligand complexesluated. Thermodynamic functions were analyzed in terms of the electrostatic (el) and non-electrostatic (cratic, c) components. ?Hc was found to be linearly correlated with the acceptor number of the metal ion (ANM), and ?H el was linearly correlated with the ionic radii of the metal ion. The calculated values for ?Go, ?Ho and ?So concluded that the complexion process processed spontaneously. Spectrophotometric measurements of Co (II), Ni(II) complexes obeyed Beer's law up to certain values, 6.6 x 103, 8.0x103 dm3mol-1cm-1, respectively, indicating that the ligand HL could be used to detect Co(II) and Ni(II) in such concentrations. The study was performed also for Fe (III)-complexes.

Early studies on the adsorption and ion exchange potential of coconut coir dust (Cocos nucifera L.) has great proficiency for removal of trace metal ions from waste water and industrial effluents. Several factors influence the process of waste water detoxification by agricultural biomass. In this paper the effect of temperature on the extent of adsorption of this metals by unconventional adsorbent is being monitored for Cu(II), Pb(II), Zn(II) and Ni(II) in aqueous solutions. The results show increase percentage adsorption with increase in temperature for all the metal ions indicating an endothermic reaction. It was also observed that the average enthalpy adsorption 0 and K0 increased with increase in temperature for all the adsorption of metal ions on the adsorbents indicating an endothermic process. The values of 0 were greater than +20kj/g/mols for most of the adsorption which supports chemisorption reaction. It was observed that the effect of temperature was more pronounced on the adsorption of the metal ions on the modified coir extract viz; CTR and STR, than the unmodified coir dust. This shows that the CTR, and STR adsorbents were more efficient at higher temperatures than the coir dust.

Wool fabric samples were dyed with the natural dye sambucus nigra, then post-mordanted with three different mordants individually: alum, chrome and ferrous. Thermal analysis of the undyed (blank), dyed and dyed mordanted samples is applied to study the thermal stability of the samples under investigation using thermogravimetry (TG) and differential scanning calorimetry (DSC) techniques. TG tested results indicate that the thermal stability of dyed wool mordanted with ferrous is enhanced than the blank (undyed) and other dyed mordanted samples. The relative TG results show that char residue of the wool samples after 600 °C is higher than the blank one, meaning lesser volatile hazardous components. DSC measurements show remarkable variation in the thermal behavior according to the type of mordant. Also, there is a change in the char yield and the temperature of decomposition. Fastness properties of the examined dyed wool fabrics were also examined and reported.