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Register a new userDetermination of residues of certain pesticides in fruits of tomatoes collected from central vegetable market in Darr´aa City
تقدير بقايا بعض المبيدات في ثمار البندورة المأخوذة من سوق الخضار المركزي في مدينة درعا
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جمعت 66 عينة من ثمار البندورة من سوق الخضار المركزي في مدينة درعا بين 20 تـشرين الأول 2009 و 4 تشرين الأول 2010 بهدف التحري عن وجود بقايا 26 مبيداً تنتمـي لمجموعـات كيميائيـة مختلفة، و ذلك باستخدام أجهزة الكروماتوغرافيا الغازية المـزودة بكواشـف (µECD ،FPD ،MSD) استخلصت بقايا المبيدات من عينات البندورة بحسب طريقة QuEChERS و حـددت خطيـة الكواشـف و حدود الكشف لكل مبيد و قُدرت نسب الاسترجاع للمبيدات المدروسة إذْ كانـت ضـمن المجـال (6.90% للفينفاليريت و حتى 5.105 %للبروبارجيت)، و قد بينت النتائج أن 5.54 % من العينات المجموعة احتـوت على بقايا قابلة للكشف، و كان الكلوربيرفوس و السايبرمثرين من أكثر المبيـدات تكراريـة فـي العينـات المجموعة، في حين كانت بقايا كل من البروبارجيت و الميثاميدوفوس و السايبرمثرين و الكلوربيرفوس هي العليا قيمةً إذْ بلغت قيمها 99.0 ،15.0 ،015.0 و 012.0 مـغ/كـغ علـى الترتيـب و تجـاوزت بقايـا الميثاميدوفوس في عينتين الحد الأقصى المسموح به بحسب دستور الغذاء في الاتحـاد الأوروبـي و لـم تتجاوز كميات بقايا أي من المبيدات الأخرى الحدود القصوى المسموح بها.
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 different 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.,
References used
Al Kurdi, G. M. 2000. Study of food contamination with pesticide residues in Kalubia governorate Ph. D theses. Faculty of agriculture. Ain Shams university. Egypt
Bempah, C. K., A. Donkor., P. O. Yeboah., B. Dubey and P. Osei-Fosu. 2011. A preliminary assessment of consumer’s exposure to organochlorine pesticides in fruits and vegetables and the potential health risk in Accra Metropolis, Ghana. Food Chemistry, 28: 1058–1065
Berrada, H., M. Fernández., M. J. Ruiz., J. C. Moltó., J. Mañes and G. Font. 2010. Surveillance of pesticide residues in fruits from Valencia during twenty months (2004/5). Food Control, 21: 36-44
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The cucumber plants grown in field were sprayed with methomyl at dose
(60-g a.i./100 liter water).The objectives of this work were to study role of
somehome Preparation (washing and peeling) in elimination of methomyl
residues from contaminated cu
cumber fruits. The washing processes caused
removal of residues methomyl from contaminated cucumber fruits that
collected at intervals: 1,3 days after one application by percent loss reached:
72,60 %, respectively.
The percent loss reached: 37.7, 45.8 % in cucumber fruits that collected at
intervals: 0, 2 days, respectively after two applications. The peeling processes
caused removal of residues methomyl from cucumber fruits that collected at
intervals: 0, 3 days after one application by percent loss reached: 58.75, 57.14
%, respectively. and in cucumber fruits that collected at intervals : 0, 2 and 3
days after two applications ,the percent loss was: 55, 62.7 and 34.6 %,
respectively.
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 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 cove
ring 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.
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.
Heavy metals determination was carried out in ٢٤ of vegetable crops, belong
to three groups, i.e.: Leaf, Fruit and Tuber vegetable crops. Lead, Chromium,
Cadmium and Mercury, were determined using Atomic Absorption
Spectroscopy provided with Graph
ite furnace. Vegetable samples were
collected from six sites along the irrigation water source for Barada and
Ghouta for two seasons, ٩٥-٩٦ and ٩٦-٩٧, to evaluate the effect of water source
(surface polluted water and ground water) on the heavy metals content of
vegetables.
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