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Register a new userStudy of Organochlorine Insecticides Residues in Soil of Damascus Ghota
دراسة بقايا المبيدات الكلورية في تربة غوطة دمشق
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Damascus University ورقة بحثية
Publication date
2001
fields
Plant Protecion
and research's language is
العربية
Authors
محمد جمال الحجار( باحث )
Created by
Shamra Editor
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أجريت هذه الدراسة في منطقة غوطة دمشق (جسرين) بهدف دراسة مستوى تلوث تربتها بالمبيدات الكلورية العضوية نتيجة للاستخدام القديم و المكثف لها. أخذت عينات التربة من مستويين الأول سطحي ٤٥ سم من سطح التربة، و استمرت الدراسة لمدة ١١ - حتى عمق ١٠ سم و الثاني على عمق ٣٠ شهرًا، حيث أخذت عينات على فترات زمنية غطت الفصول الأربعة. نقلت العينات للمخبر، و حضرت، و استخلصت باستخدام الأسيتون، و الهكسان و الكلوروفورم.
This study was carried out on soil samples collected from Damascus country side (Alghota – Jesrin), in order to study the impact of organochlorine insecticides resulted from heavy use for a long time. The duration of experiment was ١١ monthes covering four season condition. Samples were taken from two levels, the surface (١٠ cm) and the deep levels (٣٠-٤٥ cm). Soil samples were extracted by acetone, hexane and chloroform solvents. Residues were detected by using GC.
References used
Buchel, K.H. ١٩٨٣. Chemistry of pesticides. Published by John Wiley & Sons Inc
Crockett, A.B, G. B. Wiersma, H. Tai, W.G. Mitchell, P.F. Sand and A.E. Carey .١٩٧٤. Pesticide residues levels in soil and crops, FY –٧٠– National Soil Monitoring Program (ÌÌ) Pestic. Monit. J
Harris, C.R, and J.H. Mazurek. ١٩٦٦. Laboratory evaluation of candidate material as potential soil insecticides. J. Econ. Entomol
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The Barada River and the ground waters of Damascus Gouta are
considered as a source for irrigation and for increasing the fertility of
the soil since the very old times. But, the concentrate on the rabid
agricultural and industrial development led
to the aggravation of the
water shortage problem and its contamination by pesticides, chemical
pollutants and pathogens microbes. Therefore, this led to the exposition
of the plantations, livestock and human health risks.
This study aims to the estimation of the remaining effect of the
pesticides and the definition of the concentration of some hazardous
heavy metals as well as the study of numerical changes of the
pathological bacteria and parasites in the waters of the Barada River
tributaries and the ground waters in the Damascus Gouta under
different climatic conditions around the year.
This study also defines the potential health hazards related to such a
contamination as well as putting forward some necessary proposals and
recommendations for protecting the public health and environmental
safety in Damascus and its countryside.
This research aimed to study the theoretical basis of the pollutant migration
to the aquifer and to carry out some experiments concerning the migration of
some kinds of pesticides in order to calculate the related coefficients. Hence, the
research
concentrates on testing the basic methods of migration to the ground
waters, finding the physico – chemical reactions between pollutants and aquifer
and finding the differential equations which express the movements to the
ground waters which can be applied on the experimental data. It also, includes
the mechanism study of pollutant migrations through the unsaturated layer is
regarded as a passage of the pollutants to the ground waters, and the
experimental methods of the calculation of the basic migration coefficient.
In this research, 66 samples of tomatoes were collected from vegetables
central market in Darr´aa city during the period extended between 20
October/2009 - 4 October/2010) to investigate the presence of 26 pesticide
residues which belong to differ
ent chemical classes using Gas Chromatography
instruments equipped with μECD, FPD, MSD detectors. QuEChERS extraction
method was used for residue extraction from tomato samples. The detectors
linearity and pesticide detection limits were determined for every pesticide
studied, and the recovery for all pesticides ranged from 90.6 for fenvalerate to
105.5% for propargite. Results showed that 56.1% of tomato samples contained
detectable residues and Chlorpyrifos and cypermethrin were the most detected
pesticides, while amounts of propargite, methamidofos, cypermethrin,
chlorpyrifos were the largest detected and mounted to 0.99, 0.15, 0.015, 0.012
mg/kg respectively as a median values. Residues of methamidofos in only 2
samples were above the European MRLs.,
Study was conducted at Hama on summer ١٩٩٨ to determine the
Persistence of two pesticides, the Organophosphorus Dimethoate, and the
Pyrethroid Deltamethrin, on the Grapes.
A Study was carried out to evaluate the impact of some insecticide.
The results showed that no effects on growth of the studied fungi
were observation when Deltamethrin and Chlorpyrifos were used by
the low concentration.
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