scholarly journals Determination of pre-harvest interval for dimethoate and quinalphos in selected vegetables

2020 ◽  
Vol 5 (1) ◽  
pp. 42-47
Author(s):  
Md Sultan Ahmed ◽  
Afroza Begum ◽  
Debasish Sarker
Keyword(s):  
European Union ◽  
Gas Chromatography ◽  
Pesticide Residue ◽  
Field Trials ◽  
Recommended Dose ◽  
Maximum Residue Limit ◽  
Hyacinth Bean

The study was undertaken to determine the pre-harvest interval (PHI) for dimethoate and quinalphos in cauliflower, eggplant and hyacinth bean depending on Maximum Residue Limit (MRL) set by European Union. Six supervised field trials were conducted and sprayed with the recommended dose (2 ml/L of water) of each pesticide. Samples were collected at 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 and 12 days after spray (DAS). The collected samples were analyzed using Gas Chromatography (GC) with Flame Thermionized Detector (FTD) for the determination of pesticide residue. The quantities of residue were above MRL up to 9 DAS for quinalphos in cauliflower, 7 DAS in hyacinth bean, 8 DAS in eggplant; 11 DAS for dimethoate in cauliflower, 10 DAS in hyacinth bean, and 9 DAS in eggplant. At 11 DAS, no residue was detected from any of the tested samples except dimethoate in cauliflower. The determined PHI for quinalphos was 10 DAS in cauliflower, 8 DAS in hyacinth bean and 9 DAS in eggplant. In case of dimethoate it was 12 DAS in cauliflower, 11 DAS in hyacinth bean and 10 DAS in eggplant. Asian Australas. J. Biosci. Biotechnol. 2020, 5 (1), 42-47

scholarly journals Analysis of pesticide residue in vegetables collected from nine different regions of Bangladesh using Gas Chromatography

2019 ◽  
Vol 3 (1) ◽  
pp. 23-26
Author(s):  
Md Sultan Ahmed ◽  
Afroza Begum ◽  
Mohammad Dalower Hossain Prodhan ◽  
Debasish Sarker
Keyword(s):  
European Union ◽  
Gas Chromatography ◽  
Pesticide Residue ◽  
Residue Level ◽  
Local Market ◽  
Maximum Residue Limit ◽  
Living Organisms ◽  
Hyacinth Bean

The study was conducted to analyze the amount of residue of six commonly used pesticides (e.g. chlorpyriphos, quinalphos, diazinon, acephate, dimethoate and fenitrothion) in vegetables viz., hyacinth bean and eggplant samples collected from local market of nine different locations viz. Cumilla, Bogura, Rangpur, Rajshahi, Khagrachari, Cox’s bazaar, Barishal, Jamalpur and Dhaka for the comparison between the detected residue level with maximum residue limit (MRL) set by European Union. Among 36 analyzed samples of hyacinth bean six samples (16.67%) were contaminated with chlorpyriphos (0.082 mg/kg) and dimethoate residue (0.192 mg/kg - 0.961 mg/kg), all of them were above maximum residue limit. Out of 36 analyzed samples of eggplant 3 samples (8.33%) were contaminated with quinalphos (0.081mg/kg) and dimethoate residue (0.032 mg/kg - 0.217 mg/kg) which were above MRL. Most of the samples contained with dimethoate residue in both the vegetables. The presence of pesticide residue exceeding MRL in vegetables is harmful to human and other living organisms. Analyzed samples of Cumilla, Bogura, Rangpur and Rajshahi showed pesticide residue (i.e. dimethoate, chlorpyriphos and quinalphos) over MRL but the samples of other five locations like Cox’s bazar, Khagrachari, Barishal, Jamalpur and Dhaka did not show any detectable residue which might safe for consumption. Asian Australas. J. Food Saf. Secur. 2019, 3(1), 23-26

scholarly journals Estimation of residue degradation of cypermethrin and chlorpyrifos in brinjal, tomato and cauliflower under supervised field trial

2021 ◽  
Vol 6 (2) ◽  
pp. 60-67
Author(s):  
Md Sultan Ahmed ◽  
Mohammad Dalower Hossain Prodhan ◽  
Afroza Begum ◽  
Marina Afroze ◽  
Debasish Sarker
Keyword(s):  
European Union ◽  
Gas Chromatography ◽  
Electron Capture ◽  
Field Trial ◽  
Field Trials ◽  
Electron Capture Detector ◽  
Limit Set ◽  
Maximum Residue Limit ◽  
Knapsack Sprayer ◽  
Chlorpyrifos Residue

A study was carried out to detect and estimate the residue of cypermethrin and chlorpyrifos in brinjal, tomato and cauliflower using Gas Chromatography (GC) coupled with Electron Capture Detector (ECD) and Flame Thermionic Detector (FTD). Three supervised field trials were conducted and sprayed with the recommended dose of cypermethrin (1 ml/L of water) and chlorpyrifos (3 ml/L of water) in three vegetables by knapsack sprayer. Samples were collected at 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, and 11 days after spray (DAS). The quantity of cypermethrin residue was above EU-MRLs (Maximum Residue Limit set by European Union) up to 4 DAS with 0.538 mg/kg in cauliflower; 3 DAS with 0.508 mg/kg in brinjal and 0.695 mg/kg in tomato. The quantity decreased down 0.328-0.019 mg/kg in cauliflower (4-9 DAS); 0.098-0.012 mg/kg (4-7 DAS) in brinjal and 0.458-0.022 mg/kg (4-7 DAS) in tomato which were below EU-MRLs (0.5 mg/kg). The quantity of chlorpyrifos residue was above EU-MRLs up to 9 DAS with 0.012 mg/kg in cauliflower but in brinjal and tomato, the detected quantities were above EU-MRLs up to 7 DAS with 0.029 mg/kg and 0.017 mg/kg residue. No residue was detected from brinjal and tomato samples collected at 8 DAS. But in cauliflower, no residue was detected at 10 days after spray. So, brinjal, tomato and cauliflower can be harvested safely at 4 DAS and 5 DAS for cypermethrin and in case of chlorpyrifos it was 8 DAS in brinjal and tomato and 10 DAS in cauliflower. Asian Australas. J. Biosci. Biotechnol. 2021, 6 (2), 60-67

scholarly journals Analysis of the Dissipation Behavior of Defoliants in Cotton Fiber during Field and Scouring Process Using Liquid and Gas Chromatography

2019 ◽  
Vol 2019 ◽  
pp. 1-5 ◽  
Author(s):  
Mingbo Ma ◽  
Pirah Ayaz ◽  
Wanhui Jin ◽  
Munir Hussain ◽  
Wenlong Zhou
Keyword(s):  
Gas Chromatography ◽  
Liquid Chromatography ◽  
Occupational Exposure ◽  
Cotton Fiber ◽  
Applied Field ◽  
Field Trials ◽  
Maximum Residue Limit ◽  
Considerable Potential ◽  
Scouring Process ◽  
Applied Fields

Defoliants carried by cotton fiber could harm production workers and consumers through respiratory and dermal exposure. This study was carried out to evaluate the dissipation behavior of four commonly used defoliants tribufos, diuron, thidiazuron, and ethephon in cotton fiber during field stage and also in cotton scouring using liquid chromatography and gas chromatography. Field trials showed that although all the defoliants dissipated fast, however, the fiber from the tribufos and ethephon applied field had considerable potential to exceed the maximum residue limit when the fiber was harvested at common intervals after application of defoliants. The defoliant residues could be removed completely from the defoliant-carrying cotton textiles during alkaline scouring. The results indicated that attention should be paid to the risk of occupational exposure to these defoliants rather than consumer exposure. Fiber harvest on the tribufos and ethephon applied fields is recommended after a 1-week delay in order to reduce the residues to an acceptable level.

scholarly journals Translocation of residual ethoprophos and tricyclazole from soil to spinach

2021 ◽  
Vol 64 (1) ◽  
Author(s):  
Xiu Yuan ◽  
Junghak Lee ◽  
Heeju Han ◽  
Boeun Ju ◽  
Eunyoung Park ◽  
...  
Keyword(s):  
Analytical Method ◽  
Field Trial ◽  
Field Trials ◽  
Soil Samples ◽  
The Other ◽  
Maximum Residue Limit ◽  
Management Guidelines ◽  
Safe Management ◽  
Residual Amount

AbstractThe dissipation of ethoprophos and tricyclazole in soil and their translocation tendency to spinach were investigated. Prior to field trials, the analytical method for the determination of these pesticide residues was optimized and validated on soil and spinach. The field trial was conducted under greenhouse conditions for two different pretreatment periods with the pesticides. After treating with pesticides 30 (PBI-30) and 60 days (PBI-60) before seeding, soil samples were collected on different days for the dissipation study of soil. Spinach samples were harvested from the soil, and 50% and 100% mature spinach samples were collected. The initial amounts of ethoprophos residue in the PBI-60 and PBI-30 soils were 0.21 and 2.74 mg/kg, respectively, and these both decreased to less than 0.01 mg/kg on the day of spinach harvest. Similar initial residues of tricyclazole were observed in the PBI-60 (0.87 mg/kg) and PBI-30 soils (0.84 mg/kg), and these decreased to 0.44 and 0.34 mg/kg, respectively. The half-lives of ethoprophos in the soils were calculated as 7.6 and 4.8 days, respectively, while relatively long half-lives of 36.5 and 77.0 days were calculated for tricyclazole. According to the pesticide residue amounts in the spinach, the translocation rate from the soil to the spinach was determined. In the case of ethoprophos, the residual amount was already rapidly degraded in the soil, and the translocation rate could not be confirmed. On the other hand, for tricyclazole, it was confirmed that 1.19 to 1.61% of the residual amount in soil was transferred to spinach. According to these results, safe management guidelines for tricyclazole in soil were suggested considering the maximum residue limit on spinach.

A survey and measurement of residues of lindane (organochlorine pesticides) in four species of the most consumed fish in the Caspian Sea (Iran)

2006 ◽  
Vol 22 (1) ◽  
pp. 53-58 ◽  
Author(s):  
AG Ebadi ◽  
M Shokrzadeh
Keyword(s):  
Gas Chromatography ◽  
Quantitative Determination ◽  
Organochlorine Pesticides ◽  
Electron Capture Detection ◽  
Maximum Residue Limit ◽  
Public Concern ◽  
Mazandaran Province ◽  
The Caspian Sea ◽  
Electric Fishing

In this study, samples of four species of the most consumed fish (sefid, koli, kilca and kafal fish) were analysed for concentrations of lindane (organochlorine pesticides). Fish were caught using electric fishing at four sites (Chalous and Babolsar cities, Khazar Abad and Miankaleh regions) in the Mazandaran provinces of Iran. Quantitative determination of the lindane was performed by gas chromatography electron-capture detection (GC-ECD). Samples contained detectable concentrations of lindane, but at concentrations below the maximum residue limit (MRL). No differences were found in the lindane concentrations between the types of fish at each site, but there were two groups of sites that were significantly different from one another in terms of lindane concentrations: sites II-IVB/site I (PB/0.05). However, the concentrations of lindane residues in the muscle were found to be less than the FAO/WHO (1993) recommended permissible intake and should not be of public concern in Mazandaran province.

scholarly journals Detection of the amount of residue degradation rate of six commonly used insecticides in cauliflower under supervised field trial

2018 ◽  
Vol 2 (2) ◽  
pp. 109-114
Author(s):  
Md Sultan Ahmed ◽  
Md Mohsin Ali Sardar ◽  
Masum Ahmad ◽  
Kamal Humayun Kabir
Keyword(s):  
Field Trial ◽  
Degradation Rate ◽  
Field Trials ◽  
Recommended Dose ◽  
Maximum Residue Limit ◽  
Waiting Period

The present study was made to detect the amount of residue degradation rate of insecticides in cauliflower under supervised field trial. Six field trials were carried out sprayed with recommended dose of acephate (2 g/L of water), cypermethrin (1 ml/L of water) and diazinon, malathion, quinalphos and fenitrothion (2 ml/L of water of each), respectively. Samples were collected at 0, 1, 3, 5, 7, 10 and 15 days after spray (DAS). The degradation rate of cypermethrin, diazinon, quinalphos and fenitrothion were detected up to 10 days after spray (DAS) in cauliflower, while malathion and acephate could be detected at 5 and 15 DAS respectively. The detected quantities were above Maximum Residue Limit (MRL) up to 7 DAS for quinalphos, Fenitrothion and acephate, 5 DAS for diazinon and cypermethrin and 3 DAS for malathion. Malathion degraded quickly and acephate degraded slowly as compared to other tested insecticides. Therefore, malathion might be use for cauliflower cultivation having waiting period of 5 DAS and incase of diazinon and cypermethrin it was 7 DAS. Quinalphos, fenitrothion and acehate had higher waiting period of 10 DAS which might be due to slower rate of degradation. Asian Australas. J. Food Saf. Secur. 2018, 2(2), 109-114

Fate of S-[(2-Methoxy-5-oxo-Δ2-1,3,4-thiadiazolin-4-yl) methyl]-O,O-dimethyl Phosphorodithioate (Supracide) in Field-Grown Agricultural Crops and Soil

1971 ◽  
Vol 54 (1) ◽  
pp. 150-159
Author(s):  
D O Eberle ◽  
W D Hörmann
Keyword(s):  
Gas Chromatography ◽  
Detection Limit ◽  
Thin Layer ◽  
Analytical Methods ◽  
Laboratory Experiments ◽  
Field Trials ◽  
Cholinesterase Inhibition ◽  
Agricultural Crops ◽  
Oxygen Analog

Abstract Analytical methods are presented for routine determination of residues of unchanged Supracide (GS 13005; S-[(2-methoxy-5-oxo-Δ2-1,3,4-thiadiazolin-4-yl)methyl]-O,O-dimethyl phosphorodithioate), its oxygen analog (GS 13007), and 2-methoxy-5-oxo-Δ2-1,3,4-thiadiazolin (GS 12956) in different agricultural crops and soil. The unchanged insecticide is determined by gas chromatography, using both sodium thermionic and electrolytic conductivity detectors with a limit of detectability of 0.01 ppm. GS 13007 is detected on thin layer chromatographic plates by fly head cholinesterase inhibition and GS 12956 by silver nitrate with a detection limit of 0.01 ppm each. Average degradation curves from field trials are calculated statistically, and the penetration of GS 13005 into the meat and core of apples has been studied in field and laboratory experiments.

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