Residual behaviour of imidacloprid in the country bean growing soil

The assessment of residual behavior of imidacloprid (Admire 20SL) in the soil of country bean agroecosystem and its risk assessment for consumption was studied. QuEChERS method was used for the extraction and clean-up of samples and the residues of imidacloprid was estimated using Gas Chromatography. The dissipation studies in the soil system were carried out by application of imidacloprid at five different dosages i.e. 100, 200, 300, 400, and 500 g a.i. ha-1. Average initial deposits of imidacloprid were found to be 0.99, 1.33, 1.62, 1.83 and 2.20 mg.kg-1. The residues reached below determination limit (BDL) of 0.01 mg kg-1 in 9 days for recommended dose and 12 days for remaining higher dosages. Half-life (T1/2)) of imidacloprid in the soil was observed to be 1.88, 1.74, 1.73, 1.56 and 1.52 days for 100, 200, 300, 400, and 500 g a.i. ha-1, respectively. The chemodynamics study of imidacloprid spray indicated that only 27.20 -28.40% sprays were deposited to the target site (plant canopy) and 71.60-72.80% were lost to non-target site such as soil and air. The drift of imidacloprid to soil (39.47-40.20%) was higher than the air (32.13-32.60%). Based on degradation pattern and maximum, the recommended preharvest interval (PHI) might be eight 9 days and a waiting period of two days might be suggested for reapplication of the imidacloprid in country bean agroecosystem. Bangladesh J. Agril. Res. 44(1): 89-101, March 2019

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Deposition and Retention of Chlorothalonil Applied to Peanut Foliage: Effects of Application Methods, Fungicide Formulations and Oil Additives1

Peanut Science ◽

10.3146/i0095-3679-17-2-9 ◽

1990 ◽

Vol 17 (2) ◽

pp. 80-84 ◽

Cited By ~ 14

Author(s):

T. B. Brenneman ◽

H. R. Sumner ◽

G. W. Harrison

Keyword(s):

Gas Chromatography ◽

Half Life ◽

Plant Canopy ◽

Arachis Hypogaea L ◽

Center Pivot ◽

Residue Levels ◽

The Mean ◽

Application Methods ◽

Initial Deposition ◽

Petroleum Oil

Abstract Deposition and retention of chlorothalonil (CTL) on peanut (Arachis hypogaea L.) foliage was evaluated by surface-stripping leaf discs with toluene and determining the CTL concentration via gas chromatography. CTL was applied at 1.25 kg/ha via ground sprays, a center pivot-mounted underslung boom, or chemigation in 0.12, 1.7, or 17.8 kL of water/ha, respectively. Ground sprays resulted in the highest concentrations of CTL on peanut leaves followed by the underslung boom and chemigation, respectively. Residue levels were lower with the higher volume applications but were more uniformly distributed throughout the plant canopy. Deposition of chemigated CTL applied as Bravo 500(R), Bravo 720(R), or Bravo 720(R) plus either an emulsifiable vegetable oil (SoyOil 937(R) or a nonemulsifiable petroleum oil (UN Sunspray oil(R)) was also evaluated. Results of residue sampling at 0, 5, 9 and 14 days after treatment indicated that addition of either oil to Bravo 720(R) resulted in the highest initial deposition of fungicide followed by Bravo 500(R) and Bravo 720(R) alone, respectively. However, the half-life of CTL applied as Bravo 720(R) plus either oil was reduced as compared to the half-life for either Bravo 720(R) alone or Bravo 500(R). By day 14, concentrations of CTL had decreased by more than 93% in all treatments. The mean half-life of CTL for all treatments was 3.8, 4.8 and 4.8 days in the top, middle and bottom canopy layers, respectively.

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Determination of Residues of Diazinon and Chlorpyrifos in Lavender and Rosemary Leaves by Gas Chromatography

Journal of AOAC International ◽

10.5740/jaoacint.17-0193 ◽

2018 ◽

Vol 101 (2) ◽

pp. 587-592 ◽

Cited By ~ 2

Author(s):

Mamdouh R Rezk ◽

Abd El-Aziz B Abd El-Aleem ◽

Shaban M Khalile ◽

Omneya K El-Naggar

Keyword(s):

Gas Chromatography ◽

Ethyl Acetate ◽

Sodium Sulfate ◽

Half Life ◽

Capillary Gc ◽

Pesticide Application ◽

Rotary Evaporator ◽

Life Values ◽

Preharvest Interval

Abstract A sensitive gas chromatographic (GC) GC method has been developed for the determination of diazinon and chlorpyrifos residues in lavender and rosemary leaves. The developed method consists of blending weighed samples of chopped leaves with sodium sulfate as the dehydrating agent, extraction with ethyl acetate, filtration, evaporation with a rotary evaporator, and, finally, capillary GC determination of the pesticides. The recoveries of the method were greater than 90%, and the LOQ was less than 0.1 µg/mL. The method was applied to determine the rate of disappearance of diazinon and chlorpyrifos from lavender and rosemary leaves pretreated with the studied pesticides. The half-life values (t1/2) of diazinon were found to be 5.93 and 6.35 days for lavender and rosemary leaves, respectively, whereas the t1/2 values of chlorpyrifos were calculated to be 7.86 and 9.52 days for lavender and rosemary leaves, respectively. The safe harvest interval (preharvest interval; PHI) was suggested to be after 21 and 24 days for diazinon and chlorpyrifos, respectively. The PHI refers to the amount of time that must lapse (in days) after a pesticide application before a crop can be cut.

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Dissipation and Residues of Mandipropamid in Grape Using QuEChERS Methodology and HPLC-DAD

ISRN Analytical Chemistry ◽

10.5402/2012/267596 ◽

2012 ◽

Vol 2012 ◽

pp. 1-5 ◽

Cited By ~ 6

Author(s):

Farag M. Malhat ◽

Hend A. Mahmoud

Keyword(s):

Analytical Method ◽

Pesticide Residues ◽

Half Life ◽

Hplc Method ◽

Maximum Residue Limit ◽

Quechers Method ◽

Pesticide Application ◽

The Mean ◽

Preharvest Interval

The HPLC method for determination of mandipropamid residues and its dissipation in grape was investigated. The mean recoveries of the analytical method were 98–102%. The samples were collected within 2 weeks after pesticide application, and the pesticide residues were extracted by an optimized QuEChERS method. Mandipropamid dissipated rapidly with half-life 2.20 days in grape. According to maximum residue limit (MRL) the preharvest interval (PHI) of mandipropamid on grape was 4 days, after the last treatment.

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Analysis of Eight Photoinitiator Residues in Soft Drinks Using QuEChERS Method and Gas Chromatography-Tandem Mass Spectrometric Detection

CHINESE JOURNAL OF ANALYTICAL CHEMISTRY (CHINESE VERSION) ◽

10.3724/sp.j.1096.2012.20197 ◽

2013 ◽

Vol 40 (10) ◽

pp. 1536-1542

Author(s):

Yao-Hai ZHANG ◽

Bi-Ning JIAO ◽

Zhi-Qin ZHOU

Keyword(s):

Gas Chromatography ◽

Soft Drinks ◽

Mass Spectrometric ◽

Mass Spectrometric Detection ◽

Tandem Mass ◽

Quechers Method ◽

Tandem Mass Spectrometric

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Concentrations, Sources and Human Health Risk Assessment of 12 Dioxin-Like Polychlorinated Biphenyls (DL-PCBs) in the Urban Soils of Baraki, Algiers (Algeria) with Determination by Gas Chromatography - Tandem Mass Spectrometry (GC-MS/MS)

Analytical Letters ◽

10.1080/00032719.2020.1743997 ◽

2020 ◽

Vol 53 (15) ◽

pp. 2379-2399

Author(s):

Rabia Benlaribi ◽

Sébastien Schramm ◽

Bryan Vincent ◽

Safia Djebbar ◽

Frédéric Aubriet

Keyword(s):

Mass Spectrometry ◽

Risk Assessment ◽

Gas Chromatography ◽

Tandem Mass Spectrometry ◽

Health Risk ◽

Human Health ◽

Urban Soils ◽

Human Health Risk ◽

Tandem Mass ◽

Chromatography Tandem Mass Spectrometry

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Gas Chromatography–Mass Spectrometric (GC-MS) Determination of Polycyclic Aromatic Hydrocarbons in Smoked Meat and Fish Ingested by Bangladeshi People and Human Health Risk Assessment

Polycyclic Aromatic Compounds ◽

10.1080/10406638.2020.1790017 ◽

2020 ◽

pp. 1-11

Author(s):

A. R. M. Tareq ◽

S. Afrin ◽

M. S. Hossen ◽

A. S. Hashi ◽

Shamshad B. Quraishi ◽

...

Keyword(s):

Risk Assessment ◽

Gas Chromatography ◽

Polycyclic Aromatic Hydrocarbons ◽

Health Risk ◽

Human Health ◽

Aromatic Hydrocarbons ◽

Human Health Risk ◽

Mass Spectrometric ◽

Polycyclic Aromatic

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Uptake and Dissipation of Carbofuran and Its Metabolite in Chinese Kale and Brinjal Cultivated Under Humid Tropic Climate

Advances in Agriculture ◽

10.1155/2019/7937086 ◽

2019 ◽

Vol 2019 ◽

pp. 1-7

Author(s):

Siong Fong Sim ◽

Ling Yan Chung ◽

Jocephine Jonip ◽

Lian Kuet Chai

Keyword(s):

Half Life ◽

Experimental Period ◽

Fresh Weight ◽

Humid Tropic ◽

Maximum Residue Level ◽

Chinese Kale ◽

Limit Of Determination ◽

Vegetable Farming ◽

Residue Concentration ◽

Preharvest Interval

Carbofuran is an insecticide with a broad spectrum of activity and is relatively cheap. It is banned in many countries in the world; however, it remains widely used in Asia, Australia, and South America. Carbofuran is commonly used in vegetable farming in Malaysia and it is a legally registered pesticide. This study reports the uptake and dissipation of carbofuran and 3-ketocarbofuran in Chinese kale and brinjal under humid tropic field conditions. The residue profile in plants demonstrated an increase to a maximum, followed by a consistent reduction to a level below the limit of determination (<0.01 mg/kg) over the experimental period. The maximum residue concentration was attained on Day 3 for kale (1.16 mg/kg fresh weight) and Day 7 for brinjal (0.06 mg/kg fresh weight) after carbofuran application. In order to comply with the maximum residue level (MRL) of 0.01 mg/kg, the preharvest interval for kale and brinjal were suggested at 23 and 28 days, respectively. The preharvest interval indicates that carbofuran is not recommended for Chinese kale but it is acceptable for brinjal. The average half-life of carbofuran in soil is 1.24 days, shorter than the literature values reported based on temperate condition, indicating accelerated dissipation under tropical climate. The estimated half-life of carbofuran in leaves was shorter than that in fruits with kale leaves reported at 2.54 days whilst brinjal leaves and fruits recorded at 3.22 and 10.33 days, respectively.

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