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Document Type |
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Thesis |
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Document Title |
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DEVELOPMENT METHOD FOR CHROMATOGRAPHIC DETERMINATION OF PESTICIDES RESIDUES IN RICE تطوير طريقة كروملتوجرافية لتقدير بقايا المبيدات في الأرز |
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Subject |
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Faculty of Science |
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Document Language |
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Arabic |
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Abstract |
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Rice is one of the most common source of food in the world. The estimated volume of rice imports to Saudi Arabia from June 2019 to July 2020 is about 1.4 million metric tons. So Saudi Arabia is considering the second largest rice importer in the world. The total volume of rice imported worldwide for the same time period was 47.5 million metric tons (Amana Puri-Mirza 2019). The increase in rice production depends mainly on the use of agrochemicals such as pesticide, herbicides, fungicides and others. These are usually used in rice production to minimize and control insects, weeds and pests which cause reduction of the product. The presences of pesticide residues in the rice may cause health problems. For this purpose, monitoring programs have been implemented for determination of these chemicals in foods.
QuEChERS method (quick, easy, cheap, effective, rugged, and safe) (Anastassiades ,2003) and its modifications ( Han, 2017) are used in this work. The methods were efficient fast and accurate for complex materials. Different sorbents such as primary secondary amine (PSA), octadecylsilane C-18, Multi-walled carbon nanotubes MWCNTs, and Salvadora Persica (Almiswak) were evaluated for dispersive solid- phase micro extraction clean-up (DSPµE). Our objective was to develop QuEChERS method using (Al-miswak) powder as dispersive solid-phase extraction. This development was applied for determination of pesticide residues in samples of rice using gas chromatography – mass spectrometer (GC-MS) using 30 m X 0.25mm i.d X 0.25µ film thickness BR1 capillary column. The sorbent (Al-Miswak) presented the best result among the sorbent evaluated. The recoveries (N = 3) for most of the compounds were above 85% with a relative standard deviation below 8.473 % (n= 5). The method was satisfactorily applied for analysis of pesticides residues in real rice samples. The established strategy was satisfactorily validated by comparing the results with the official method for analysis of pesticides in rice samples. Salvadora persica sorbent provides cost-effectiveness , reliability, accuracy and it can be used for the routine quality control of the pesticide residues in complex matrices. |
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Supervisor |
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Prof. Saleh Omar Bahafi |
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Thesis Type |
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Master Thesis |
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Publishing Year |
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1442 AH
2020 AD |
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Added Date |
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Tuesday, September 8, 2020 |
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Researchers
| نورة السبيعي | Al-Subaie, Nasser | Researcher | Master | |
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