This study was carried out to determine the total content of flavonoids of dried and
fresh hawthorn flowers and leaves in water and hydroalcolic extracts. The method of cold
and hot maceration was used to prepare these extracts. The active compound
s which were
found in these extracts were detected by many chemical reactions. The results of these tests
showed that the extracts contain: phenols, flavonoids, and saponins.The total content of
flavonoids was determined using spectrophotometric methods by forming complex with
aluminum chloride and measurement absorbance at 510nm, it has been shown that quantity
of flavonoids in dried samples ranges from 0.16 to 1%, while it's quantity in fresh samples
0.026- 0.18%.
A new, simple and sensitive kinetic spectrophotometric
method has been proposed for the determination of tropicamed
(TPC) in pure and pharmaceutical formulations. The method is
based on oxidation TPC by potassium permanganate in strong
alkaline m
edium (pH=12) to form green colored product with
absorbance maximum at 610nm.
New, accurate, sensitive and reliable kinetic spectrophotometric
method for the assay of fluvastatin sodium (FVS) in pure form and
capsules has been developed. The method involves the oxidative
coupling reaction of FVS with 3-methyl-2-benzothiazolinone hydrazone
hydrochloride monohydrate (MBTH) in the presence of Ce(IV) in an
acidic medium to form colored product with lambdamax at 615 nm.
In this research the development of the conditions of the determine copper duo by spectrophotometric method that based on the formation of a complex with Alizarin Red S was accamplished with the presence of fallow acid when the wavelength(220 nm), th
at by studying the effect of PH and the impact if the interference caused by the presence of some metal ions (nickel ions, chromiun ions, 2 inc ions, calciom ions, and triple iron ions) which make it difficult for the progress of determine copper by Alizarin Red S. the best PH value for this process is (pH = 9.5) and the relationship of Lambert Bear realized within the range 0.2 – 125 mg/ml the detection limit was 0.OO1µg/ml.
A sensitive, simple, selective spectrophotometric method has been developed for determination Cobalt (II) with 1-(2-pyridylazo)-2 naphthol (PAN). This method ralies on the formation of stable red colored complex at pH=4.1 which has an absorption maximum at 580nm.
This research has included quarterly and periodically physical and chemical analysis of treatment wastewater in the Latakia countryside during year 2011 by testing three treatment plants similar in the mechanism of action and distributed in three v
illages (Happit, Al-Harah, Marg Moairban).
This study has included the measurement of temperature, pH, dissolved oxygen, turbidity, and determination of nitrate, phosphate, sulfate, and chloride.
In this research, potentiometric using Selective Electrodes ISEs, the Visible Spectrum, and the Turbidimetry methods were used.
The results showed significant differences in concentrations of the studied ions between one station to another. The highest nitrate concentrations (228.33mg/l) were recorded in Happit treatment plant especially in summer, and the highest phosphate concentrations (41.81mg/l) were in Happit treatment plant in summer. Whilst the highest sulfate concentrations which ranged between (508.67– 1157.33)mg/l were in Al-Harah treatment plant at all seasons. The highest chloride concentrations (310.33mg/l) recorded in Happit treatment plant in summer.
The statistical study has demonstrated and showed high and sometimes low correlation coefficient R2 so that gives clear indications about the sources of pollution.
A set of 72 samples were formalized by mixing pure olive oil with vegetable
oils: Corn, Soya bean, Sunflower, cotton by percentages of 5, 10, 20, 30 and 40
percet respectively. Specific extinction at wavelengths 232nm, 266nm, 270nm
and 274nm were
measured for three replicates of each sample by using
Spectroscopy technique in ultra violet range, ΔK value (alterative of variation of
the specific extinction at the wavelength of maximum absorption near 270 nm)
and R value (EB270nm / EB232nm) were calculated.
The results showed the possibility of using ΔK value to detect the
adulteration of Olive oil up to 6.5 ±0.004%, 4.4 ±0.004 %, 0.8 ±0.006% and
0.08±0.005% for Soya bean, Corn, Sunflower and cotton oil, respectively. While
these values at 270 nm were 5±0.048%, 5.8 ±0.048%, 1.1±0.077% and
2.6±0.053% in the same arrangement. The absorption value at wavelength
232nm did not show any sign in detecting the adulteration. According to R
value, the minimum detected percentages of adulteration were 20 and 10 for
Corn and Soya been oil, Cotton and Sunflower oil subsequently .
We recommend to use ΔK to detect the adulteration of Olive oil mixed with
low percentages of vegetable oil.
This paper outline a new, simple, selective and sensitive spectrophotometric
procedure for the quantitative determination of iron. The bidentate ligand of 2-
(1-Acetyl-2-oxopropyl)acrylonitrile has been synthesized ,and determined by
elemental ana
lysis and infrared spectroscopy. The compound reacts with
Fe(III) to form a colored complex with an absorption maxima at 400nm and
490nm. The effect of pH, amount of reagent, time, temperature and the
interference of many ions on the Fe (III) determination was also estimated.
Beer's law is obeyed for iron concentration in the range (0.23- 4.48μg/ ml) for
spectrophotometric method and (0.56-8.4) for extraction spectrophotometric
method. The molar absorptivity was in the rang 2.70x104-3.46 x 104 L.mol-1cm-1.
Sandall's sensitivity was found to be 1.61 x 10 -3 – 2.07 x 10-3 μg . cm-2.
The RSDs for both spectrophotometric and extraction spectrophotometric
methods were below 3%. The analytical error SD/√n was within 0.021. The
technique has been applied to the determination of iron in alloys and in
pharmaceutical preparations.
