WCOT Capillary Column GC/FT-IR and GC/MS for Identifying Toxic Organic Pollutants

1981 ◽  
Vol 35 (5) ◽  
pp. 469-472 ◽  
Author(s):  
Kenneth H. Shafer ◽  
M. Cooke ◽  
F. DeRoos ◽  
R. J. Jakobsen ◽  
O. Rosario ◽  
...  
Keyword(s):  
Capillary Column ◽  
Polar Compounds ◽  
Priority Pollutants ◽  
Library Search ◽  
Ft Ir ◽  
Complementary Nature ◽  
Standard Solution ◽  
The Individual ◽  
Nonpolar Compounds ◽  
Combined Data

The combined data of high-resolution chromatography GC/FT-IR and GC/MS is used to identify a standard solution of priority pollutants. Identifications made by the individual library search routines are compared and an improvement is demonstrated in the number of identifications with the combined GC/FT-IR and GC/MS data. Both GC/FT-IR and GC/MS separations are performed on WCOT capillary columns. This provides the best separation possible and also permits fast and efficient comparison of spectral data when separations are performed on the same type of column. GC/FT-IR shows more selectivity for polar compounds, whereas GC/MS selectivity favors nonpolar compounds. These selectivity differences emphasize the complementary nature of (and the need for) both GC/FT-IR and GC/MS information.

scholarly journals Kinetical Study, Thermo-Mechanical Characteristics and Recyclability of Epoxidized Camelina Oil Cured with Antagonist Structure (Aliphatic/Aromatic) or Functionality (Acid/Amine) Hardeners

Polymers ◽  
2021 ◽  
Vol 13 (15) ◽  
pp. 2503
Author(s):  
Chiara Di Mauro ◽  
Aratz Genua ◽  
Alice Mija
Keyword(s):  
Disulfide Bonds ◽  
Mechanical Characteristics ◽  
Dicarboxylic Acids ◽  
Thermomechanical Properties ◽  
Chemical Recycling ◽  
Camelina Oil ◽  
Ft Ir ◽  
Tan Δ ◽  
The Individual ◽  
First Time

In an attempt to prepare sustainable epoxy thermosets, this study introduces for the first time the idea to use antagonist structures (aromatic/aliphatic) or functionalities (acid/amine) as hardeners to produce reprocessable resins based on epoxidized camelina oil (ECMO). Two kinds of mixtures were tested: one combines aromatic/aliphatic dicarboxylic acids: 2,2′-dithiodibenzoic acid (DTBA) and 3,3′-dithiodipropionic acid (DTDA); another is the combination of two aromatic structures with acid/amine functionality: DTBA and 4-aminophenyl disulfide (4-AFD). DSC and FT-IR analyses were used as methods to analyze the curing reaction of ECMO with the hardeners. It was found that the thermosets obtained with the dual crosslinked mechanism needed reduced curing temperatures and reprocessing protocols compared to the individual crosslinked thermosets. Thanks to the contribution of disulfide bonds in the network topology, the obtained thermosets showed recycling ability. The final thermomechanical properties of the virgin and mechanical reprocessed materials were analyzed by DMA and TGA. The obtained thermosets range from elastomeric to rigid materials. As an example, the ECMO/DTBA704-AFD30 virgin or reprocessed thermosets have tan δ values reaching 82–83 °C. The study also investigates the chemical recycling and the solvent resistance of these vitrimer-like materials.

New Technology Communication in American State Governments

2012 ◽  
pp. 1806-1823
Author(s):  
Hyun Jung Yun ◽  
Cynthia Opheim
Keyword(s):  
Political Participation ◽  
New Technology ◽  
State Level ◽  
Electronic Systems ◽  
State Governments ◽  
Individual Level ◽  
Political Exclusion ◽  
The Individual ◽  
Combined Data

This study examines the effects of states’ e-government efforts, more specifically the progress of e-service and e-democracy, on citizens’ general political engagement and electoral participation. Utilizing the combined data with the state level of West’s e-Government measures (2008) and the individual level of the 2008 American Election Study, this study finds a strong link between state sponsored efforts at e-Government and traditional forms of the public’s political participation. State sponsored digital services and outreach increase general political participation more than campaign activities, and the implementation of e-democracy has a greater effect on mobilization than e-service. The results imply that e-government has potential to ameliorate political exclusion by letting the politically disadvantaged access a higher quality of information with an equalized accessibility through state governments’ electronic systems.

New Technology Communication in American State Governments

2012 ◽  
pp. 573-590
Author(s):  
Hyun Jung Yun ◽  
Cynthia Opheim
Keyword(s):  
Political Participation ◽  
New Technology ◽  
State Level ◽  
Electronic Systems ◽  
State Governments ◽  
Individual Level ◽  
Political Exclusion ◽  
The Individual ◽  
Combined Data

This study examines the effects of states’ e-government efforts, more specifically the progress of e-service and e-democracy, on citizens’ general political engagement and electoral participation. Utilizing the combined data with the state level of West’s e-Government measures (2008) and the individual level of the 2008 American Election Study, this study finds a strong link between state sponsored efforts at e-Government and traditional forms of the public’s political participation. State sponsored digital services and outreach increase general political participation more than campaign activities, and the implementation of e-democracy has a greater effect on mobilization than e-service. The results imply that e-government has potential to ameliorate political exclusion by letting the politically disadvantaged access a higher quality of information with an equalized accessibility through state governments’ electronic systems.

Fused silica capillary column GC/MS for the analysis of priority pollutants

1981 ◽  
Vol 4 (8) ◽  
pp. 366-384 ◽  
Author(s):  
A. D. Sauter ◽  
L. D. Betowski ◽  
T. R. Smith ◽  
V. A. Strickler ◽  
R. G. Beimer ◽  
...  
Keyword(s):  
Capillary Column ◽  
Fused Silica ◽  
Priority Pollutants ◽  
Fused Silica Capillary ◽  
Silica Capillary Column ◽  
Silica Capillary

scholarly journals Study of the Influence of the Almond Shell Variety on the Mechanical Properties of Starch-Based Polymer Biocomposites

Polymers ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 2049 ◽  
Author(s):  
Ana Ibáñez García ◽  
Asunción Martínez García ◽  
Santiago Ferrándiz Bou
Keyword(s):  
Charpy Impact ◽  
X Ray Diffraction ◽  
Almond Shell ◽  
Scanning Calorimetry ◽  
Commercial Mixture ◽  
Hardness Tests ◽  
Twin Screw ◽  
Ft Ir ◽  
Mechanical Tensile ◽  
The Individual

This article is focused on the development of a series of biodegradable and eco-friendly biocomposites based on starch polymer (Mater-Bi DI01A) filled with 30 wt% almond shell (AS) of different varieties (Desmayo Rojo, Largueta, Marcona, Mollar, and a commercial mixture of varieties) to study the influence of almond variety in the properties of injected biodegradable parts. The different AS varieties are analysed by means of Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), Scanning Electron Microscopy (SEM), and X-ray Diffraction (XRD). The biocomposites are prepared in a twin-screw extruder and characterized in terms of their mechanical (tensile, flexural, Charpy impact, and hardness tests) and thermal properties (differential scanning calorimetry (DSC) and TGA). Despite observing differences in the chemical composition of the individual varieties with respect to the commercial mixture, the results obtained from the mechanical characterisation of the biocomposites do not present significant differences between the diverse varieties used. From these results, it was concluded that the most recommended option is to work with the commercial mixture of almond shell varieties, as it is easier and cheaper to acquire.

Simultaneous GC-FT-IR/GC-MS Analysis for Isomer-Specific Identification and Quantitation of Complex Mixture Components

1992 ◽  
Vol 46 (2) ◽  
pp. 277-282 ◽  
Author(s):  
N. R. Smyrl ◽  
D. M. Hembree ◽  
W. E. Davis ◽  
D. M. Williams ◽  
J. C. Vance
Keyword(s):  
Mass Spectrometry ◽  
Sampling Method ◽  
Capillary Column ◽  
Complex Mixture ◽  
Gas Chromatography Mass Spectrometry ◽  
Infrared Spectrometry ◽  
New Instrument ◽  
Ft Ir ◽  
The Fourier Transform ◽  
Conventional Manner

The construction and capabilities of a new instrument combining infrared and mass spectrometry to simultaneously examine the effluent from a single capillary column gas chromatographic injection are described. Gas chromatography-mass spectrometry (GC-MS) is performed in the conventional manner. However, the Fourier transform infrared (FT-IR) portion of the instrument employs a new sampling method involving low-temperature trapping of the effluent from the gas chromatograph. The mass spectrometer was over two orders of magnitude more sensitive (161 fg detection limit for naphthalene) than the infrared (40 pg). The qualitative capabilities of infrared spectrometry, particularly when isomerspecific identifications are necessary, are shown to be highly complementary to the usual GC-MS method for analyzing complex mixtures

Synthesis, Characterization and Biological Activities of Substituted 1-[Benzothiazol-(1H)-2-yl]-3-phenyl-prop-2-en-1-ones

2019 ◽  
Vol 4 (3) ◽  
pp. 144-146
Author(s):  
C. Anuba ◽  
T.F. Abbs Fen Reji
Keyword(s):  
Antioxidant Activities ◽  
Biological Activities ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Free Radical Scavenging ◽  
Ft Ir ◽  
Standard Solution ◽  
Uv Visible ◽  
Substituted 1 ◽  
Mtt Assays

A series of ortho and para substituted 1-[benzothiazol-(1H)-2-yl]-3-phenyl-prop-2-en-1-one derivatives were synthesized from 2-acetyl benzothiazole and ortho and para-substituted benzaldehye using ethanol as solvent. The synthesized compounds were characterized by UV-visible, FT-IR, 1H NMR and mass spectrometry. Antioxidant activities of synthesized compounds have been evaluated by DPPH free radical scavenging activity using ascorbic acid as standard. The standard solution and 1-[benzothiazol- (1H)-2-yl]-3-phenylprop-2-en-1-ones compounds were prepared with different concentrations. Anticancer activity of 1-[benzothiazol-(1H)-2-yl]-3-phenylprop-2-en-1-one and 1-[benzothiazol-(1H)- 2-yl]-3(4-chlorophenyl)prop-2-en-1-one were assigned by MTT assays.

Research Strategy for the HPLC/FT-IR Analysis of Drug Metabolites

1997 ◽  
Vol 51 (6) ◽  
pp. 866-873 ◽  
Author(s):  
D. E. Pivonka ◽  
K. M. Kirkland
Keyword(s):  
Spectroscopic Analysis ◽  
Research Strategy ◽  
Solution Phase ◽  
Drug Metabolites ◽  
Infrared Spectroscopic Analysis ◽  
On Line ◽  
Ft Ir ◽  
Complementary Nature ◽  
Ir Analysis ◽  
Primary Focus

A strategy for the infrared spectroscopic analysis of drug metabolites in high-pressure liquid chromatography (HPLC) effluent is presented with a primary focus on delivery of metabolite structure as opposed to development of dedicated or automated instrumentation. This paper stresses the complementary nature of on-line (solution phase) and off-line (condensed phase) HPLC Fourier transform infrared (FT-IR) implementations for structural elucidation of drug metabolites.

scholarly journals Plant extracts as an astounding remedy to anemia - A review

2018 ◽  
Vol 7 (4) ◽  
pp. 2166
Author(s):  
Upasana Saha ◽  
Purva Sudesh Dharwadkar ◽  
Susmita Sur ◽  
Vishaharini V. ◽  
Madhu Malleshappa
Keyword(s):  
Iron Content ◽  
Psidium Guajava ◽  
Nutritional Deficiencies ◽  
Iron Supplements ◽  
Natural Iron ◽  
Standard Solution ◽  
The Individual ◽  
Nutritional Benefits ◽  
Neurogenic Disorders ◽  
Commercial Iron

Anemia is one of the most widespread nutritional deficiencies of blood which affect the populations of all ages throughout the world, children and adolescents being at a significantly higher risk for the condition. Medicinal plants have been a source of succor in the control of many diseases in developing countries and anemia is no exception. Treatment of anemia involves an iron-rich diet, iron and vitamin supplements. Iron supplements that are commercially available, if consumed too much of which can lead to circumstances like Hemochromatosis, Neurogenic Disorders and sometimes even cancer. In this study, extracts of different plants (Moringa oleifera, Psidium guajava, Cymbopogon citratus, and Trigonella foenum-graecum) were examined for their iron content to formulate some natural iron product to put forth as a solution to iron deficiency. The total iron content in the standard solution and samples of selected plant were obtained by phenanthroline method modified using analysis by absorption spectrophotometer. The spectrophotometric studies reveal the amount of iron content and hence the efficiency of the species in combatting anemia. Since these are natural sources, the food supplements designed from their extracts are expected to provide a solution to the disease without causing the harmful effects of the commercial iron supplements and also alongside provide other nutritional benefits to the individual.

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