Aug 31, 2017Open AccessArticle
Uv-visible and fluorescence
spectra of the ligand 1,3-bis(2,2’:6’,2’’-ter- pyridyl-5-ymethylsulfanyl)propane L and it’s iron(II) complex have been investigated for
analytical purposes. The two spectra of L and terpy are very similar which
confirmed the ability of L to co-ordinate through the six N atoms of L with
minimum distortion of the metal ion’s octahedral
Aug 16, 2017Open AccessArticle
The performance of egg-shells and fish-scales biomaterials in separating
chromium (VI) ions from tannery effluents obtained from tannery industries in
Jinja town of Eastern Uganda was investigated. Using crushed egg-shell and
fish-scales as adsorbents, sorption tests were carried out to determine the
effects of bio-sorbent concentration and particle size on chromium (VI)
removal. The adsorbate concentration in the tannery effluent
Mar 30, 2017Open AccessArticle
Introduction: A possible fragmentation
pathway of atorvastatin was proposed based on rational interpretation of high
resolution collision induced dissociation (CID) fragmentation spectral data. Method: The mass spectral (MS and MS/MS) data of
atorvastatin was obtained by using a flow injection analysis, LC coupled with high resolution mass analyzer system with Q-TOF technology. Results: The elemental composition
Mar 09, 2017Open AccessArticle
Jujube polysaccharide is one of the important natural active ingredients. In this paper, microwave extraction technology was utilized to extract jujube polysaccharide in different conditions using the yield as test index. The results showed that the optimum conditions were solid-liquid ratio 1:30, ultrasonic lasting time 25 min, temperature 50℃, which achieve the highest yield rate 5.38%.
Apr 21, 2016Open AccessArticle
The present work describes the validation of an analytical method for
chromatographic determination of chlorimuron ethyl herbicide (compound of
sulphonylurea group) in sediments, in according with Brazilian legislation,
following the guidance and normative documents of INMETRO (DOQ-CGCRE-008) and
ANVISA (Resolution RE no. 899-2003). The results show that the chromatographic
method demonstrated to be selective, accurate, precision and linear over the
concentration range of 5.0 - 1000.0 μg·L﹣...
Mar 08, 2016Open AccessArticle
A study was conducted to characterize Modjo tannery effluent (wastewater)
and determine its impact on the Modjo River using some physicochemical
parameters. Accordingly, three tannery wastewater samples along wastewater
channel at different distances have been taken and three river water samples
(one upstream and two downstream) were collected along the river to determine
its impact on the river. The samples have been analyzed for temperature, pH,
electrical conductivity (EC), total dissolved so...
Jan 27, 2016Open AccessArticle
The present study describes the catalytic activity of the platinum coated
Nafion membranes towards oxygen reduction reaction in proton exchange membrane
fuel cells. In contrast to the conventional three layered structures of the gas
diffusion electrode, as-made gas diffusion electrodes are two layered in which
the platinum electrocatalyst are deposited directly onto the Nafion membrane. Spin-coating
method and impregnation-reduction approaches were used to synthesize Pt-coated
Nafion membranes. ...
Dec 02, 2015Open AccessArticle
Aluminum doped ZnO thin films were grown using chemical spray pyrolysis.
The doped films showed only blue and UV photoluminescence at room temperature.
The position of the near band edge emission was found to agree with the
theoretical value of ZnO nanocrystal band gap. The full width at half maximum
for the near band edge emission at room temperature was found to be ~ 100 meV,
which indicated films to be of very good device quality. The presence of a weak
photoluminescence at 3.08 ± 0.02 eV in ...
Nov 05, 2015Open AccessArticle
A microwave-assisted extraction was optimized for the evaluation of
persistent organic pollutants in liquid fertilizer samples. The extraction
process was defined by a 23 factorial design. The parameters (temperature
and sample and solvent volume) were optimized through the response surface
methodology (RSM). The data for the study were based on injection of a mix of
organochlorine pesticides. In optimized conditions, the microwave-assisted
extraction was carried out at 70℃ for 10 min...
Sep 21, 2015Open AccessArticle
Water that contains high amounts of Mg and Ca metals is hard water. The presence
of these metal ions in water prevents the water from lather formation with soap.
This leads to the consumption of large amounts of soaps which cause loss of economy.
In light of the problem, this study is conducted to investigate the capability of
cactus powder to remove Mg and Ca metals from hard water using FAAS. The result
revealed that the concentration of both Mg and Ca metals decreased as the dose of