Gas-Phase Postderivatization Following Solid-Phase Microextraction for Determining Acidic Herbicides in Water

1998 ◽  
Vol 70 (9) ◽  
pp. 1963-1968 ◽  
Author(s):  
Maw-Rong Lee ◽  
Ren-Jye Lee ◽  
Yih-Wen Lin ◽  
Ching-Ming Chen ◽  
Bao-Huey Hwang
Keyword(s):  
Gas Phase ◽  
Solid Phase Microextraction ◽  
Solid Phase ◽  
Acidic Herbicides

scholarly journals Volatile Terpenes and Terpenoids from Workers and Queens of Monomorium chinense (Hymenoptera: Formicidae)

Molecules ◽  
2018 ◽  
Vol 23 (11) ◽  
pp. 2838 ◽  
Author(s):  
Rui Zhao ◽  
Lihua Lu ◽  
Qingxing Shi ◽  
Jian Chen ◽  
Yurong He
Keyword(s):  
Mass Spectrometry ◽  
Gas Phase ◽  
Solid Phase Microextraction ◽  
De Novo ◽  
Solid Phase ◽  
Mandibular Glands ◽  
Headspace Solid Phase Microextraction ◽  
Unknown Structure ◽  
Volatile Terpenes

Twenty-one volatile terpenes and terpenoids were found in Monomorium chinense Santschi (Hymenoptera: Formicidae), a native Chinese ant, by using headspace solid-phase microextraction (HS-SPME) coupled with gas-phase chromatography and mass spectrometry (GC-MS), which makes this ant one of the most prolific terpene producers in insect. A sesquiterpene with unknown structure (terpene 1) was the main terpene in workers and neocembrene in queens. Terpenes and terpenoids were detected in poison, Dufour’s and mandibular glands of both workers and queens. Worker ants raised on a terpene-free diet showed the same terpene profile as ants collected in the field, indicating that de novo terpene and terpenoid synthesis occurs in M. chinense.

On-fibre silylation following solid-phase microextraction for the determination of acidic herbicides in water samples by gas chromatography

2005 ◽  
Vol 537 (1-2) ◽  
pp. 259-266 ◽  
Author(s):  
I. Rodríguez ◽  
E. Rubí ◽  
R. González ◽  
J.B. Quintana ◽  
R. Cela
Keyword(s):  
Gas Chromatography ◽  
Water Samples ◽  
Solid Phase Microextraction ◽  
Solid Phase ◽  
Acidic Herbicides

Gas-Phase Analysis of Trimethylamine, Propionic and Butyric Acids, and Sulfur Compounds Using Solid-Phase Microextraction

2002 ◽  
Vol 74 (5) ◽  
pp. 1054-1060 ◽  
Author(s):  
Hyunook Kim ◽  
Cristina Nochetto ◽  
Laura L. McConnell
Keyword(s):  
Gas Phase ◽  
Phase Analysis ◽  
Solid Phase Microextraction ◽  
Solid Phase ◽  
Sulfur Compounds

scholarly journals Headspace solid phase microextraction in the analysis of pesticide residues: Kinetics and quantification prior to the attainment of partition equilibrium

2007 ◽  
Vol 72 (8-9) ◽  
pp. 879-887 ◽  
Author(s):  
Rada Djurovic ◽  
Mirjana Markovic ◽  
Dragan Markovic
Keyword(s):  
Gas Phase ◽  
Pesticide Residues ◽  
Solid Phase Microextraction ◽  
Solid Phase ◽  
Polymer Interfaces ◽  
Sorption Equilibrium ◽  
New Approach ◽  
Headspace Solid Phase Microextraction ◽  
Proportional Relationship ◽  
Partition Equilibrium

A new theoretical approach to the headspace/solid phase microextraction (HS/SPME) process is proposed and tested by the analysis of pesticide residues of water samples. The new approach focuses on mass transfer at the sample/gas phase and gas phase/SPME polymer interfaces. The presented model provides a directly proportional relationship between the amount of analytes sorbed by the SPME fiber and their initial concentrations in the sample. Also, the expression indicates that quantification is possible before partition equilibrium is attained. Experimental data for pesticides belonging to various classes of organic compounds were successfully interpreted by the developed model. Additionally, a linear dependence of the amount of pesticide sorbed on the initial analyte concentration in aqueous solution was obtained for a sampling time shorter than that required to reach sorption equilibrium.

scholarly journals Determination of volatiles in beer using solid-phase microextraction in combination with gas chromatography/mass spektrometry 

2014 ◽  
Vol 32 (No. 3) ◽  
pp. 241-247 ◽  
Author(s):  
J. Kleinová ◽  
B. Klejdus
Keyword(s):  
Carbon Dioxide ◽  
Gas Phase ◽  
Solid Phase Microextraction ◽  
Solid Phase ◽  
Liquid Extraction ◽  
Analyte Concentration ◽  
Ultrasonic Bath ◽  
Boiling Points ◽  
Distribution Constants

Headspace solid phase microextraction and purge and trap analysis were used for the determination of volatiles in beer. These methods were compared with the analysis of unconcentrated gas phase and liquid extraction. Solid phase microextraction proved to be the most useful and was investigated more closely. Volatiles were isolated by the means of different combinations of sorbents, sorption was performed at various temperatures and times. The addition of salt to the sample and stirring of the sample were examined to enhance the analyte concentration in the gas phase. Ultrasonic bath and filtration were tested to remove carbon dioxide. Not all methods improved the sorption of volatiles. Stirring was characterised by low repeatability and ultrasonic bath causes to the loss of volatile analytes. Distribution constants of volatiles depend on their boiling points and thus different sorption temperatures are suitable for different substances.

Use of solid-phase microextraction to detect and quantify gas-phase dicarbonyls in indoor environments

2006 ◽  
Vol 1131 (1-2) ◽  
pp. 275-280 ◽  
Author(s):  
Bruce D. Pacolay ◽  
Jason E. Ham ◽  
J.R. Wells
Keyword(s):  
Gas Phase ◽  
Solid Phase Microextraction ◽  
Solid Phase ◽  
Indoor Environments
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