Dissipation kinetics of spiromesifen on tea (Camellia sinensis) under tropical conditions

Sharma, Khushbu; Dubey, Jatiender Kumar; Deka, Sankar Chandra; Chandrasekaran, S.; Kalpana, -; Gupta, Pratigya; Kumar, Anoop; Vandana, .; Devi, Menaka; Singh, Balwinder; Baruah, Anuradha; Kennedy, J. S.; Sharma, I.D.; Patyal, Surender Kumar; Nath, Amit

doi:10.1016/j.chemosphere.2006.12.091

Cited by 14 publications

(9 citation statements)

References 2 publications

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“…This information alone was extremely promising as it corresponded well to the unknown compound's molecular ion, base peak, and the unusually empty gap between them. Their published mass spectrum of spiromesifen, ranging from m/z 100 to 300, was consistent with our unknown mass spectrum (6). However, this range cut off significant ions, including the molecular ion.…”

Section: Wilson and Graff The Identification Of Spiromesifen A Recsupporting

confidence: 87%

“…In the end, a focused Internet search that used both a hypothesized product from case context, and the major ions from the mass spectral data, was successful in identifying the unknown compound, and thus, the key to determining what the liquid was. An Internet search using the term “insecticide” or “pesticide” along with “m/z 272” and “370” led to a pair of papers from researchers studying residues of spiromesifen, a recently introduced pesticide . A search using any one of these terms alone would not have been able to single out these papers.…”

Section: Discussionmentioning

confidence: 99%

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The Identification of Spiromesifen, a Recently Introduced Pesticide, Using Approaches to Chemical Unknown Analysis

Wilson

Graff²

2012

Journal of Forensic Sciences

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An unknown, viscous, opaque, white liquid with a strong, unpleasant odor was submitted with a request for identification. It was analyzed using infrared (IR) spectroscopy, gas chromatography-mass spectrometry, and X-ray fluorescence spectroscopy. It was found to contain glycerin as well as another compound. IR and mass spectral data were readily obtained for this second component, but it was not easily identified as common instrument libraries had no matching spectra. After an extensive literature search, the unknown compound was identified as spiromesifen, a recently introduced pesticide. The IR spectrum and electron impact mass spectrum of spiromesifen are presented here as these are not available in the published literature. This case report also provides useful approaches for searching for and identifying an unknown compound when it is not found in a laboratory's spectral libraries.

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Section: Wilson and Graff The Identification Of Spiromesifen A Recsupporting

confidence: 87%

Section: Discussionmentioning

confidence: 99%

The Identification of Spiromesifen, a Recently Introduced Pesticide, Using Approaches to Chemical Unknown Analysis

Wilson

Graff²

2012

Journal of Forensic Sciences

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“…The DT 50 values calculated from regression equation was found 2-2.5 days (Table III). The DT 50 of spiromesifen in brinjal has been reported two to three days (Sharma et al, 2006b), and in apple and tea as 5-6 and 5-8.5 days, respectively (Sharma et al, 2005(Sharma et al, , 2006a. The time required for 99% dissipation of spiromesifen residues (DT 99 ), calculated from regression equation was 14.5-16.8 days.…”

Section: Residues In Chilimentioning

confidence: 97%

“…The behaviour of spiromesifen in tomato, cotton, apple, brinjal and lettuce under simulated field conditions has been reported (Sharma et al, 2005(Sharma et al, , 2006aWeber, 2005). Spiromesifen does not tanslocate to the fruit in any of the crops.…”

Section: Introductionmentioning

confidence: 94%

Persistence and Dissipation Kinetics of Spiromesifen in Chili and Cotton

Sharma

Rao

Dubey

et al. 2006

Environ Monit Assess

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In a field study carried out at three different locations, the dissipation of spiromesifen on cotton and chili was studied and its DT50, and DT99 were estimated at each location. Spiromesifen was sprayed on chili at 96 and 192 g a.i. ha(-1) and cotton at 120 and 240 g a.i. ha(-1). Samples of chili fruits were drawn at 0, 1, 3, 5, 7, 10, 15, 21, 30 days after treatment and that of cotton seed and lint at first picking and harvest. Soil samples were drawn 30 days after treatment from 0 to 15 and 15 to 30 cm layer. Quantification of residues was done on GC-MS in Selected Ion Monitoring (SIM) mode in mass range 271-274 m/z. The LOQ of this method was found 0.033 microg g(-1), LOD being 0.01 microg g(-1). The DT50 of spiromesifen when applied at recommended doses in chili fruits was found to be 2.18-2.40 days. Ninety-nine percent degradation was found to occur within 14.5-16.3 days after application. Residues of spiromesifen were not detected in cotton seed and lint samples at the first picking. In soil, no residues of spiromesifen were detectable 15 days after treatment.

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“…The half-lives of spiromesifen from treatment at 96 g a.i. ha −1 varied from 5.5 to 6.2 days on apple, 2.18 to 2.4 days on chilli, 5.0 to 8.5 days on tea, and 0.93 to 1.38 days on tomato from multi-locational field studies carried out earlier (Sharma et al 2005;Sharma et al 2006;Sharma et al 2007;Sharma et al 2014). The preharvest interval was calculated based on the European Union prescribed maximum residue limit (MRL) of 0.02 mg kg − 1 for spiromesifen on cabbage (Anonymous 2012).…”

Section: Half-lives and Phimentioning

confidence: 98%

Residue level and dissipation pattern of spiromesifen in cabbage and soil from 2-year field study

Siddamallaiah

Mohapatra

2016

Environ Monit Assess

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Spiromesifen is a new class of insecticide used for the control of whiteflies and mites which have developed resistance to the more commonly used neonicotinoids. Dissipation pattern of spiromesifen on cabbage was evaluated over 2 years by conducting supervised field studies as per good agricultural practices. Cabbage and soil samples were extracted and purified using modified QuEChERS method and analyzed through gas chromatography (GC). Confirmatory studies were carried out by liquid chromatography-tandem mass spectrometry (LC-MS/MS). The recoveries of spiromesifen from cabbage and soil were between 85.44 and 103.37% with the relative standard deviation (RSD) between 3.2 and 9.4% (n = 6). The limit of detection (LOD) and limit of quantification (LOQ) were 0.003 μg mL(-1) and 0.01 mg kg(-1), respectively. The measurement uncertainties (MUs) were within 9.9-14.9%. Initial residues of spiromesifen on cabbage were 0.640 and 1.549 mg kg(-1) during 2013 and 0.723 and 1.438 mg kg(-1) during 2014 from treatments at standard and double doses of 125 and 250 g active ingredient (a.i.) ha(-1), respectively. Spiromesifen residue dissipation followed first-order rate kinetics, and it degraded within the half-lives of 2.9 and 3.9 days during 2013 and 3.2 and 4.5 days during 2014. The residue levels reached below the maximum residue limit (MRL; 0.02 mg kg(-1)) within 15-17 days at the standard dose and 24-27 days at the double dose. The field soil analyzed at harvest (30 days) was free from spiromesifen residues. Metabolite spiromesifen-enol was not detected in any sample which was confirmed through LC-MS/MS analysis.

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Dissipation kinetics of spiromesifen on tea (Camellia sinensis) under tropical conditions

Cited by 14 publications

References 2 publications

The Identification of Spiromesifen, a Recently Introduced Pesticide, Using Approaches to Chemical Unknown Analysis

The Identification of Spiromesifen, a Recently Introduced Pesticide, Using Approaches to Chemical Unknown Analysis

Persistence and Dissipation Kinetics of Spiromesifen in Chili and Cotton

Residue level and dissipation pattern of spiromesifen in cabbage and soil from 2-year field study

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