scholarly journals Determination of Pesticide Residues in Most Commonly Consumed Leafy Vegetables in Riyadh Region (Al-Kharej Province)

2019 ◽  
Vol 28 (2) ◽  
pp. 63-73
Author(s):  
Turki Kh. Faraj Turki Kh. Faraj
Keyword(s):  
Pesticide Residues ◽  
Spinacia Oleracea ◽  
Leafy Vegetables ◽  
Petroselinum Crispum ◽  
Anethum Graveolens ◽  
Kingdom Of Saudi Arabia ◽  
Liquid Liquid Extraction ◽  
Residue Levels ◽  
Higher Doses

A total of 81 samples of various leafy vegetables viz., Rocket (Eruca sativa), Lettuce (Lactuca sativa), Coriander (Coriandrum sativum), Corchorus (Corchorus olitorius), Parsley (Petroselinum crispum), Spinach (Spinacia oleracea), Radish (Raphanus sativus), Dill (Anethum graveolens), Mint (Mentha sachalinensis) and Green onions (Allium cepa) were collected from 20 different areas in Riyadh region of the Kingdom of Saudi Arabia. Liquid-Liquid Extraction of extraction partitioning method and confirmation by gas chromatograph-mass spectrometer for the presence of various pesticide residues was performed. Pesticide residues were detected in all the collected samples with varying concentrations. A variety of pesticides including organochlorines, organophosphates, pyrethroids, carbamates, herbicides, acaricides and insecticides have been identified in the samples. While the residue levels were low for most pesticides, higher levels of chlorpyrifos (0.123 mg/kg and resmethrin (0.1 mg/kg) were found in Rocket, carbaryl (0.92 mg/kg) in spinach and corchorus (0.116 mg/kg), permethrin (total cis + trans permethrin) inlettuce (0.103 mg/kg) and coriander (0.126 mg/kg), and cypermethrin in parsley (0.126 ppm). The highest maximum residue limit (MRL) values of pesticide residues on leafy vegetables of 0.10 mg/kg were observed for carbaryl in Spinach and Corchorus, whereas in Parsley an MRL of 0.5 mg/kg was found. The current research shows that in some leafy vegetables, higher doses of pesticides were found.

scholarly journals Representative commodity for six leafy vegetables based on the determination of six pesticide residues by gas chromatography

2019 ◽  
Vol 31 (1) ◽  
pp. 49-56 ◽  
Author(s):  
Shiming Song ◽  
Huili Huang ◽  
Zhaojie Chen ◽  
Jie Wei ◽  
Cheng Deng ◽  
...  
Keyword(s):  
Gas Chromatography ◽  
Pesticide Residues ◽  
Leafy Vegetables

Determination of pesticide residues in leafy vegetables at parts per billion levels by a chemometric study using GC-ECD in Cameron Highlands, Malaysia

2017 ◽  
Vol 224 ◽  
pp. 55-61 ◽  
Author(s):  
Yang Farina ◽  
Md Pauzi Abdullah ◽  
Nusrat Bibi ◽  
Wan Mohd Afiq Wan Mohd Khalik
Keyword(s):  
Pesticide Residues ◽  
Leafy Vegetables ◽  
Cameron Highlands

scholarly journals Pesticide residues in cow’s milk

Mljekarstvo ◽  
2021 ◽  
Vol 71 (3) ◽  
pp. 165-174
Author(s):  
Milivoje Ćosić ◽  
Keyword(s):  
Pesticide Residues ◽  
Large Series ◽  
The Other ◽  
Milk Samples ◽  
Commission Regulation ◽  
Maximum Residue Levels ◽  
Residue Levels ◽  
Quality Of Milk

Quality of milk plays a key role in its wide consumption but also of its involvement in a large series of derived products, such as yogurt, cheese, butter, and ice cream. An effective LC-MS/MS method has been validated for the determination of 81 different pesticide residues in milk samples. The analyses comprised 44 milk samples collected during 2019. From all inspected pesticides, only metalaxyl (present in 11.36 % samples), bifenthrin and metolachlor (9.09 %), dimethoate (4.55 %), prochloraz and thiacloprid were detected in 2.27 % of analysed samples. The detections of trifloxystrobin and bifenthrin were above the maximum residue levels (MRLs). The Commission Regulation (EU) 2017/1135 standardizes the MRLs for dimethoate and omethoate in certain products, but a MRL for dimethoate residues in milk has not been established jet. All the other pesticide detections were below the MRLs.

scholarly journals SALLE combined with LD-DLLME for pesticides analysis in sugar and soil samples

2021 ◽  
Vol 35 (1) ◽  
pp. 1-16
Author(s):  
T. Tolcha ◽  
K. Gomoro ◽  
N. Megersa
Keyword(s):  
Pesticide Residues ◽  
Concentration Level ◽  
Soil Samples ◽  
Gas Chromatography Mass Spectrometry ◽  
Optimum Conditions ◽  
Salting Out ◽  
Liquid Liquid Extraction ◽  
Dispersive Liquid Liquid Microextraction ◽  
Liquid Microextraction

In this study, a modified salting-out-assisted liquid-liquid extraction (SALLE) combined with low density dispersive liquid-liquid microextraction (LD-DLLME) has been developed for quantitative determination of multiclass pesticide residues (atrazine, diazinon, ametryn, terbutryn, chlorpyrifos, dimethametryn, 4,4'-dichlorodiphenyldichloroethylene (4,4'-DDE), 4,4'-dichlorodiphenyldichloroethane (4,4'-DDD) and 4,4'-dichloro- diphenyltrichloroethane (4,4'-DDT)) levels in sugar and soil samples coupled with gas chromatography–mass spectrometry (GC-MS) detection. The extract was enriched after combining SALLE to LD-DLLME and enrichment factor obtained ranged 30-121. Under the optimum conditions, the linearity of the method was in the range of 6.25–100 ng g-1 for atrazine, ametryn, terbutryn, dimethametryn and 4,4'-DDT, and in the range of 2.5–100 ng g-1 for diazinon, chlorpyrifos and 4,4'-DDD, and in the range of  1–100 for 4,4'-DDE with correlation coefficient of  0.992 or better. The limits of detection (LODs) ranged from 0.01–0.25 ng g-1. The precisions as %RSD, were below 10% for both matrices. The recoveries obtained from spiked sugar and soil samples at 5 and 50 ng g-1 ranged from 79 to 111%. The method was subsequently applied to real sugar and soil samples. All the pesticides investigated were not detected in the sugar sample. The soil sample was contaminated by atrazine and ametryn at concentration level of 0.3 and 0.2 ng g-1, respectively.                     KEY WORDS: SALLE, LD-DLLME, Extraction, Pesticide residues, Sugar, Soil   Bull. Chem. Soc. Ethiop. 2021, 35(1), 1-16. DOI: https://dx.doi.org/10.4314/bcse.v35i1.1  

Ion-pair assisted liquid–liquid extraction for selective separation and analysis of multiclass pesticide residues in environmental waters

2014 ◽  
Vol 6 (13) ◽  
pp. 4633-4642 ◽  
Author(s):  
Abera Gure ◽  
Negussie Megersa ◽  
Negussie Retta
Keyword(s):  
Quantitative Determination ◽  
Pesticide Residues ◽  
Extraction Method ◽  
Environmental Water ◽  
Liquid Extraction ◽  
Ion Pair ◽  
Environmental Waters ◽  
Extraction Solvent ◽  
Liquid Liquid Extraction

Ion-pair-assisted liquid–liquid extraction method, using acetonitrile as the extraction solvent, for the quantitative determination of ten multiclass pesticides in environmental water.

Modified Storherr Method for Determination of Organophosphorus Pesticides in Nonfatty Food Total Diet Composites

1981 ◽  
Vol 64 (3) ◽  
pp. 714-719
Author(s):  
Louis J Carson
Keyword(s):  
Liquid Chromatography ◽  
Pesticide Residues ◽  
Organophosphorus Pesticides ◽  
Organophosphorus Pesticide ◽  
Gas Liquid Chromatography ◽  
Flame Photometric Detector ◽  
Limit Of Quantitation ◽  
Total Diet ◽  
Residue Levels

Abstract The method of Storherr et al. for organophosphorus pesticide residues in nonfatty foods has been modified to permit its use in analyzing the composites of nonfatty foods in the Food and Drug Administration Total Diet Program. Modifications were designed to permit the examination by gas-liquid chromatography (GLC) of the larger weight (100 mg) of sample equivalent required by the Total Diet program. To achieve a limit of quantitation of 2 ppb parathion, the organophosphorus pesticides are determined by GLC equipped with flame photometric detector (P-mode) and/or KCl thermionic detector. Recovery data, ranging from 70 to 133%, are presented for fortification (2-10 ppb) of organophosphorus pesticides in 7 nonfatty food Total Diet composites. The modified Storherr method was successfully tested in an intralaboratory method trial of 2 Total Diet composites (potatoes and legumes) fortified at 5-13 ppb with malathion, parathion, paraoxon, and monocrotophos. In addition, the modified Storherr method was compared to existing FDA Total Diet methodology for the determination of incurred organophosphorus residues. Residue levels found by both methods were similar for malathion (30 ppb), parathion (7 ppb), and diazinon (1 ppb), but only the modified Storherr method was capable of determining about 10 ppb dimethoate and phorate in the cereals and grains composite.

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