Applied Chemistry

The voltammetry methods have revealed in the water of the Cotonou channel, the presence of organic and inorganic complexes of metals, such as: Zn-Carbonate, Zn2+, ZnSO4, Zn-OM, Cu-Carbonate, Cu2+, Cu(OH)2, Cu-OM, Pb-Carbonate, Pb2 +, Pb-OM, Cd-Carbonate, Cd2+, and Cd-OM. Their concentrations were variable with the water pH and depended on the season. At pH values ranging 6.5 - 7.2, metals were complexed by carbonate ions present in the water. Zinc is predominantly present as Zn2+ in the rainy season and Cu2+ levels were decreasing when pH was increasing. 80% of the total lead appeared to be complexed as Organic matter complex lead (Pb-OM), and cadmium (Cd-OM) which, unlike other metals, was mainly present in free Cd2+ form.

This present work aims to investigate dyeing performance of some new azo disperse dyes belonging to diazotization of 1, 4-bis (2-amino-1, 3, 4-thiadiazolyl) benzene and coupling with different amines as to comparing and contrasting depth obtained of shade and levelness. Some new dyes, such, has been examined, and assessed. The study was concerned mainly with dye uptake, behavior and efficiency. Color measurements, kinetics and thermodynamic parameters were involved. Conventional dyeing, was considered as control for obtained results.

Chemical analysis of the leaf of Bryophyllym pinnanun was carried out. The moisture content and the ash content were found to be 83.91% ± 0.21 and 13.30% ± 0.41. The leave of the plant was found to contain Na, Ca, K, Mn, Mg, Fe, Cu, Cr and Zn. The level of these mineral in mg/ l00g sample were found to be 0.13% ±0.3, 599.97%, ± 24.54; 5.51% ± 0.08; 4.71% ±0.27; 247.11% ± 33.11; 6.62% ± 1.72; 82.96% ± 6.96: 60.%% ± 8.01 and 0.10% ± 0.01 respectively. The elemental analysis using sodium fusion test shows that the leave contain nitrogen, chlorine, and bromine. The present of these mineral elements in the plant could be part of the contributing factors which suggest the use of the plant for various therapeutic applications.

Heavy organic deposition in the production and processing of crude oil has been a problem in the oil and gas sector. Although, some efforts have been made to minimise it such as changes in composition, pressure and/or temperature; this study attempts to address the Nigerian situation. The article investigated the onset of heavy organic precipitation by transmitting microscopy study of the precipitant volumes reported for single nC5; nC6; nC7 and nC8 alkane precipitants as 5.02ml, 5.05ml, 6.00ml and 7.10ml respectively to start precipitation in 1:1 (v/v) precipitant: toluene solution to 2±0.5g crude oil. Their varied binary mixtures nC5:nC6; nC5: nC7; nC5: nC8; nC6: nC7; nC7: nC8 showed onset of HO precipitation with ratios of 7:3, 1:1, 4:1, 3:2 and 9:1 respectively with no onset volume detected for nC6: nC8 within the ratio range being investigated. Hence, the outcome of these results of the precipitant volumes at onset of HO precipitation for single n-alkanes and volume ratios of binary mixture n-alkane solvents should not be altered or exceeded during injection of fluids for enhanced oil recovery or as diluents into Afiesere heavy crude oil to improve flow properties.

Rice bran, one of the most abundant and valuable byproducts produced during the rice milling process, is of steadily growing interest in recent years due to its potential health benefits. Herein, we investigate and report the physicochemical properties of rice bran obtained from Mubi, Adamawa State, Nigeria. The rice bran was initially combusted and soil samples of the baked, unbaked soil and surrounding particular area where we carried out the combustion were collected and analyzed for its physicochemical properties. The results revealed that the baked soil has a higher concentration of calcium, magnesium, potassium and sodium than the unbaked soil. Furthermore, retention of water (tension) and the ability to absorb water (infiltration) was discovered to be higher in the baked soil sample. This shows that the heat of combustion of rice bran affects the physical, chemical and mechanical properties of soil in a peculiar way.

The employability skills are regarded as valuable in employment success. The application of employability skills in the present and future workplaces also facilitates employees’ job performance. Explanatory correlational research design was used in the study which was aimed at determining the relationship between the practice of employability skills and contextual performance of employees. Drawn from The Conference Board of Canada’s Employability Skills 2000+ and Borman and Motowidlo’s Taxonomy of Contextual Performance, two sets of survey questionnaires were adopted to collect data from 220 sampled respondents representing employers and employees of 25 government institutions in Central Mindanao region of the Philippines. Results showed that government employees practiced fundamental, personal management and teamwork skills to some extent. Also, these employees demonstrated satisfactory contextual performance as perceived by the two groups of respondents. Moreover, inferential analysis revealed that practice of employability skills had significant moderate positive relationship to contextual performance. The use of employability skills, therefore, needs to be sustained to pave way to improved extra-role behaviors that help meet the requirements and demands of public institutions

Simple chemical bonding method to synthesize cyclodextrin–chitosan/nano graphene oxide (CCGO) was reported. The adsorption behaviors of Cu(II) in aqueous solution on CCGO were systematically investigated. The procedure is based on the selective formation of Cu(II) at optimum pH by elution with organic eluents and determination by flame atomic absorption spectrometry. The method is based on complex formation on the surface of the ENVI-18 DISKTM disks modified cyclodextrin–chitosan/nano graphene oxide (CCGO) followed by stripping of the retained species by minimum amounts of appropriate organic solvents. The elution is efficient and quantitative. The effect of potential interfering ions, pH, CCGO amount, stripping solvent, and sample flow rate were also investigated. Under the optimal experimental conditions, the break-through volume was found to about 1000mL providing a preconcentration factor of 600. The maximum capacity of the disks was found to be 398± 3 µg for Cu2+.The limit of detection of the proposed method is 5ng per 1000mL.The method was applied to the extraction and recovery of copper in different water samples.

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).

Schiff bases are typically synthesized by the condensation of amines and a carbonyl bearing compounds. Schiff bases are important intermediates for the synthesis of various bioactive compounds.These compounds and their metal complexes are very important as catalysts in various biological systems, polymers, dyes and medicinal and pharmaceutical fields. Furthermore, they are reported to show a variety of biological activities including antibacterial and antifungal activities.

The main aim of science and technology is to better man’s life and his environment. Every learning situation in science based courses, subjects or areas requires a repertoire of essentials skills to achieve success. Success is built in every learning and learner but demands the right skills. Since no learner is perfect, such skills in learning make the learner more proficient as he continues to study and practice. One of such skills is the rightful and positive attitudes. Attitude can distort the perception of information and affect the degree of their retention. This paper examines what constitutes students’ positive learning attitudes, habits, behaviours and qualities that are predictors to positive attitudes which in turn beget positive results in science learning. Factors which beget negative learning attitudes and their implications to learning are also considered.