Determination of Selected Pesticide Residues from Gilgel Gibe (I) Hydroelectric Dam Reservoir and Its Tributaries, Jimma Zone, Ethiopia

سال انتشار: 1399
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 241

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شناسه ملی سند علمی:

JR_IJNC-7-1_002

تاریخ نمایه سازی: 14 اسفند 1398

چکیده مقاله:

In this study, the level of selected organophosphorus and organochlorine pesticide residues from water samples of Gilgle Gibe (I) hydroelectric dam reservoir and its potential tributaries, Jimma zone, Ethiopia, was determined by gas chromatography-electron capture detector (GC-ECD). Low density based dispersive liquid-liquid microextraction (LD-DLLME) using toluene (as extractant) and acetonitrile (as disperser) was used for extraction of pesticide residues from the samples. Calibration curves constructed at six concentration points have good linearity with coefficient of determination (r2) ranging from 0.995 - 0.999. The limits of detection (LOD) and quantification (LOQ) of the method which were determined as 3 and 10 times the signal-to-noise ratio were ranging from 0.0001 - 2.5810 µg/L and 0.0005 - 8.6050 µg/L, respectively. The efficiency of the method was also evaluated using recovery studies by spiking the water samples with known concentrations of the analytes. The obtained recoveries were ranging from 67 - 105% with relative standard deviations of 0.79 - 12.5%. The findings revealed that the studied water samples contain significant amount of the target pesticides, but endrin was not detected in any of the water sample. Methidathion was also detected only in Nada Qalla and Nada Gudda river water samples. The detected residual concentrations of the target pesticides were above the maximum residue limits, except DDT in acute toxic level. The finding indicated that the studied water samples contain considerable amount of the studied residual pesticides that can influence the health of aquatic organisms and other consumers.

کلیدواژه ها:

Pesticide residues ، Water samples ، dispersive liquid-liquid microextraction ، Gas chromatography-electron capture detector

نویسندگان

Meaza Dejene

Department of Chemistry, College of Natural Sciences, Jimma University, Jimma, Ethiopia

Kassim Kedir

Department of Chemistry, College of Natural Sciences, Jimma University, Jimma, Ethiopia

Seblework mekonen

Department of Environmental Health Science and Technology, Faculty of Public Health, Jimma University, Jimma, Ethiopia

Abera Gure

Department of Chemistry, College of Natural Sciences, Jimma University, Jimma, Ethiopia

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