Quantitative Analysis of Alkaloidal Constituents in Imported Fire Ants by Gas Chromatography

2014 ◽  
Vol 62 (25) ◽  
pp. 5907-5915 ◽  
Author(s):  
Yu-Ting Yu ◽  
Hong-Yi Wei ◽  
Henry Y. Fadamiro ◽  
Li Chen
Keyword(s):  
Gas Chromatography ◽  
Quantitative Analysis ◽  
Fire Ants ◽  
Alkaloidal Constituents ◽  
Imported Fire Ants

scholarly journals The Fate of Bifenthrin and Fipronil in Pine Bark Nursery Media

HortScience ◽  
2004 ◽  
Vol 39 (4) ◽  
pp. 791D-791 ◽  
Author(s):  
Russell S. Harris* ◽  
Edward W. Bush* ◽  
Ronald J. Ward
Keyword(s):  
Gas Chromatography ◽  
Organic Compounds ◽  
Pure Water ◽  
Fire Ants ◽  
Pine Bark ◽  
Irrigation Frequency ◽  
Imported Fire Ants

Bifenthrin and fipronil are important pesticides used in the nursery industry for the control of imported fire ants. Our research measured the influence of irrigation frequency and time on the degradation of bifenthrin and fipronil in pine bark nursery medium. Pine bark media leachates were collected over a 180-d period. Levels of bifenthrin, fipronil, and metabolites of fipronil (MB 46513, MB 45950, MB 46136) were measured using gas chromatography and mass spectrophotometery. Bifenthrin leachate concentrations decreased from 60 ppb on day 1 to ≈1 ppb after 120 d. Fipronil leachate concentrations decreased from 40 ppb on day one to a low of 15 ppb after 120 d. In contrast, metabolites MB 45950 and MB 46136 gradually increased over the 180-d period. Metabolite MB 46513 was not detected during the experiment. Pine bark medium leachate concentrations of bifenthrin and fipronil were greater than previously reported levels in pure water. We theorize that organic compounds present in pine bark may have increased the solubility of these chemicals.

scholarly journals Nitrogen-containing aromatic compounds: quantitative analysis using gas chromatography with nitrogen phosphorus detector

2021 ◽  
Author(s):  
Yuan Rao ◽  
Arno de Klerk
Keyword(s):  
Gas Chromatography ◽  
Quantitative Analysis ◽  
Aromatic Compounds ◽  
Process Development ◽  
Complex Mixtures ◽  
Response Factors ◽  
Cyanide Anion ◽  
Nitrogen Phosphorus Detector ◽  
Assurance Process ◽  
Nitrogen Containing Compounds

AbstractThe nitrogen-containing aromatic compounds found in the petrochemical industry are varied and extend beyond classes such as the anilines, pyrroles and pyridines. Quantification of these nitrogen-containing compounds that may occur in complex mixtures has practical application for quality assurance, process development and the evaluation of conversion processes. Selective detection of nitrogen-containing species in complex mixtures is possible by making use of gas chromatography coupled with a nitrogen phosphorous detector (GC-NPD), which is also called a thermionic detector. Despite the linearity of the NPD response to individual nitrogen-containing compounds, the response factor is different for different compounds and even isomers of the same species. Quantitative analysis using an NPD requires species-specific calibration. The reason for the sensitivity of the NPD to structure is related to the ease of forming the cyano-radical that is ionized to the cyanide anion, which is detected. The operation of the NPD was related to the processes of pyrolysis and subsequent ionization. It was possible to offer plausible explanations for differences in response factors for isomers based on pyrolysis chemistry. Due to this relationship, the NPD response can in the same way be used to provide information of practical relevance beyond its analytical value and a few possible applications were outlined.

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