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Register a new userAdsorption Kinetic Study of cadmium and lead in the soil column using the experiment
دراسة حركية ادمصاص الكادميوم و الرصاص في التربة باستخدام تجربة العمود
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نُفذت تجربة مخبرية بهدف دراسة حركية ادمصاص الكادميوم و الرصاص في التربة و ذلك باستخدام تجربة أعمدة التربة، حيث تم استخدام التركيز 26.25 ملغ/ل للكادميوم، و 27.81 ملغ/ل للرصاص، و درجتين من الرقم الهيدروجيني 5.5 ,7 مع استخدام خمسة معاملات.
Carried out a laboratory experiment in order kinetics study of adsorption of cadmium and lead in the soil, using soil columns experiment, with the use of concentration 26.25 mg / l for cadmium, and 27.81 mg / l for lead, and two degrees of pH 5.5, 0.7, with the use of five parameters.
References used
FORSTNER U, 1991- Soil pollution phenomena-mobility of heavy metals in contaminated soil. C. F. Bolt et al., 1991. Interaction at the soil colloid-soil solution interface. Kluwer Academic Publish . Dordrecht. Boston, London
WU, L. 2004- Review of 15 years of research on ecotoxicology and remediation of land contaminated by agricultural drainage sediment rich in selenium. Ecotoxicol. Environ. Saf., 57: 257-269
MURRAY, B., A. YEN, C. MCKAY AND G. POWELL., 1999- "Penetrator identification of Paleolake deposits: A Low-cost, High- yield Early Mars Micromission." Presented at Micromission workshop on Feb 1, 2, in Paris
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The study investigated the possibility of removing heavy metal ions (Cd, Pb) from
aqueous solutions using adsorption method on the citrus peel (orange), which is a solid
waste available in abundance especially in the Syrian coast as well as easy to
use at low
cost. The optimal conditions for the simultaneous adsorption of the ions (Cd 2+, Pb 2+) on
the surface of orange peel (dry, soft) were determined.The concetration of ions was
determined using (DPASV) method Which is characterized by Sensitivity and high
accurawcy. The results showed that the optimum adsorption conditions were at pH = 5 ,
equleibrium time = 60 min, and the initial concentration is ( C0 = 50-200) ppm,The
application of the Langmuir and Frienlish models showed that Frienlish model is best fited
for expressing the adsorption of Pb ions on the surface of dry and soft orange peel and for
expressing the adsorption of Cd ions on the surface of soft orange peel , Langmuir model
is best fited for expressing the adsorption of Cd ions on the surface of dry orange peel.
The method applied its selected terms to realistic samples of processed and industrial
waste water, which showed a unique response as a purification method for the water
media.
The sludge of wastewater used in agriculture processes, in order to knew the effect of
its application on soil and plant contents from zinc and cadmium, Hordeum vulgare L. was
planted by using graded amounts of sludge to the soil for two years, fou
r treatments were
used: o kg/pot (control), 2, 4, 6 ton/ha (with 5 erplicates for each treatment), concentrations
of zinc and cadmium in soil, roots, straw, and grain in all treatments were measured.
Results showed that the application of sludge improve the physical and chemical
properties of the soil, the concentration of zinc and cadmium in the soil were 164.66 μg/g,
324.22 ng/g, respectively, in 60 ton/ha treatment.
Concentration of Zn increased significantly and showed positive correlation with the
amount of sludge, the highest concentration of Zn was in root of plant in comparison with
other parts of plant, in all treatments, it was 69.3 μg/g in the root while it was 45.15, 38.2
μg/g in straw and grain respectively, in 0.6 kg/pot treatment.
Concentration of cadmium increased significantly in 0.6 kg/pot treatment in
comparison with control, the highest concentration was in the root of plant in comparison
with other parts of plant.
This study showed that Hordeum vulgare L. doesn't accumulate zinc and cadmium
because it´s concentration in roots was higher than in straw and grain.
Concentration of Zn and Cd still within permissible limits in the soil and plants in all
treatments.
In this study, the concentration of Pb and Cd was determined in some agricultural
products in order to compare this concentration and to know the capacity of these products
to accumulate these two elements. The samples were digested by nitric acid
and the
elements were determined by the atomic absorption spectroscopy. The results showed that
the concentration of lead and cadmium in protected products was less than the
concentration in unprotected products, and the concentration of lead was more than the
cadmium, these results can be explained by the extensive use of lead and the unprotected
agriculture products were exposed to the air pollution more than the protected products.
This study estimated the levels of lead and cadmium in 12 chocolate and cocoa
samples from latakia markets by atomic absorption spectrometry . Most of the samples,
were well known Syrian trademarks.
The results showed that concentration of lead in
samples of dark chocolate ranged
between 0.061 and 0.49 mg\ kg ,and in samples of cocoa between 0,10 and 0,51 mg\ kg,
but it was much less 0.01 - 0. 16 mg\ kg in white chocolate and Imported chocolates.
concentration of cadmium in samples of dark chocolate ranged between 0.01 and 0.24 mg\
kg and in samples of cocoa between 0.03 and 0.231 mg\ kg. but it was also less in white
chocolate and imported chocolates 0.01 - 0.051 mg\ kg.
The results indicated that dark chocolates have higher concentrations of lead and
cadmium than white chocolates and that the levels of lead and cadmium are generally
higher than the common levels in developed countries ,and thus. might be a significant
source of lead and cadmium ingestion, Raw materials should be checked before use for
metal contents in order to decrease the concentrations of these metals in final chocolate
products..
The aim of the present study was to determine the levels of lead and cadmium in the
meat, liver and kidney of sheep exposed in the local markets of the city of Latakia, and to
compare the results with those reported by other countries and with the
maximum
acceptable levels for human consumption, Lead and cadmium were determined by atomic
absorption spectrometry (AAS).
The mean concentrations of lead in meat, liver and kidney were 0.043, 0.284 and
0.118 mg/kg fresh weights, respectively, while mean concentrations of cadmium were
0.017, 0.173 and 0.252 mg/kg fresh weights, respectively. Statistical analysis showed a
significant difference in lead and cadmium concentrations between liver and kidney and in
meat.
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