A Gas-Chromatographic Micromethod for Respiration Studies on Insects

1971 ◽  
Vol 54 (2) ◽  
pp. 437-441
Author(s):  
U. TADMOR ◽  
S. W. APPLEBAUM ◽  
R. KAFIR
Keyword(s):  
Carbon Dioxide ◽  
Thermal Conductivity ◽  
Oxygen Consumption ◽  
Molecular Sieve ◽  
Chromatographic Method ◽  
Porapak Q ◽  
Chilocorus Bipustulatus ◽  
Initial Separation ◽  
Carbon Dioxide Release ◽  
Gas Chromatographic Method

1. A gas-chromatographic method adapted for measuring both oxygen consumption and carbon dioxide release of individual insects is described. 2. The method is based on initial separation of air from CO2 on Porapak Q, and infsequent separation of oxygen from nitrogen on molecular sieve 5A. 3. 1-2µl. of O2 or CO2 are easily measured with the thermal conductivity apparatus used. 4. Representative respiratory values of field-collected and laboratory-reared adult Chilocorus bipustulatus beetles are presented in order to show the capability of the method.

scholarly journals The Use of Cryogenic Temperature Gas Chromatography for the Determination of Carbon Monoxide and Carbon Dioxide in Cigarette Smoke

1972 ◽  
Vol 6 (4) ◽  
Author(s):  
G.P. Morie ◽  
C.H. Sloan
Keyword(s):  
Carbon Dioxide ◽  
Gas Chromatography ◽  
Carbon Monoxide ◽  
Liquid Nitrogen ◽  
Cigarette Smoke ◽  
Cryogenic Temperature ◽  
Chromatographic Method ◽  
Porapak Q ◽  
Gas Chromatographic Method

AbstractA gas chromatographic method for the determination of carbon monoxide and carbon dioxide in cigarette smoke was developed. A column containing Porapak Q packing and a cryogenic temperature programmer which employed liquid nitrogen to cool the column to subambient temperatures was used. The separation of N

Microbial efficiency in a meromictic reservoir

2008 ◽  
Vol 37 (2) ◽  
Author(s):  
Grażyna Mazurkiewicz-Boroń ◽  
Teresa Bednarz ◽  
Elżbieta Wilk-Woźniak
Keyword(s):  
Carbon Dioxide ◽  
Oxygen Consumption ◽  
Release Rate ◽  
Oxygen Consumption Rate ◽  
Consumption Rate ◽  
Metabolic Efficiency ◽  
Sulphur Compounds ◽  
Carbon Dioxide Release ◽  
Microbial Efficiency ◽  
Ion Contents

Microbial efficiency in a meromictic reservoirIndices of microbial efficiency (expressed as oxygen consumption and carbon dioxide release) were determined in the water column of the meromictic Piaseczno Reservoir (in an opencast sulphur mine), which is rich in sulphur compounds. Phytoplankton abundances were low in both the mixolimnion (up to 15 m depth) and monimolimnion (below 15 m depth). In summer and winter, carbon dioxide release was 3-fold and 5-fold higher, respectively, in the monimolimnion than in the mixolimnion. Laboratory enrichments of the sulphur substrate of the water resulted in a decrease in oxygen consumption rate of by about 42% in mixolimnion samples, and in the carbon dioxide release rate by about 69% in monimolimnion samples. Water temperature, pH and bivalent ion contents were of major importance in shaping the microbial metabolic efficiency in the mixolimnion, whilst in the monimolimnion these relationships were not evident.

An improved back-flush-to-vent gas chromatographic method for determination of trace permanent gases and carbon dioxide in ultra-high purity ammonia

2016 ◽  
Vol 1447 ◽  
pp. 129-134 ◽  
Author(s):  
Maxim M. Trubyanov ◽  
Georgy M. Mochalov ◽  
Ilya V. Vorotyntsev ◽  
Andrey V. Vorotyntsev ◽  
Sergey S. Suvorov ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
High Purity ◽  
Chromatographic Method ◽  
Ultra High Purity ◽  
Gas Chromatographic Method ◽  
Permanent Gases

Gas Chromatographic Determination of Isofenphos in Technical and Formulated Products: Collaborative Study

1987 ◽  
Vol 70 (1) ◽  
pp. 55-57
Author(s):  
Daniel E Terry
Keyword(s):  
Thermal Conductivity ◽  
Gas Chromatography ◽  
Chromatographic Method ◽  
Collaborative Study ◽  
Internal Standard ◽  
Chromatographic Determination ◽  
Flame Ionization ◽  
Coefficients Of Variation ◽  
Gas Chromatographic Method

Abstract A gas chromatographic method for the determination of isofenphos (OFTANOL®) in isofenphos technical and liquid formulations has been developed and collaboratively studied by 11 laboratories. Two technical samples and 2 liquid flowable samples were analyzed after shaking/extracting in methanol which contained diisobutyl phthalate as an internal standard. The extracts were analyzed by gas chromatography using an SP-2100 column and either flame ionization or thermal conductivity detection. Coefficients of variation were 0.57 and 1.27% for the technical and formulated products, respectively. The GC method has been adopted official first action as a AOACCTPAC method.

Gas Chromatographic Determination of Methylene Chloride, Ethylene Dichloride, and Trichloroethylene Residues in Spice Oleoresins

1969 ◽  
Vol 52 (3) ◽  
pp. 477-481
Author(s):  
Laura A Roberts
Keyword(s):  
Chromatographic Method ◽  
Methylene Chloride ◽  
Chromatographic Determination ◽  
Ethylene Dichloride ◽  
Gas Chromatograph ◽  
Porapak Q ◽  
Relative Retention ◽  
Solvent Residues ◽  
Gas Chromatographic Method

Abstract A gas chromatographic method has been developed for determining methylene chloride, ethylene dichloride, and trichloroethylene residues in spice oleoresins. The proposed method employs a Porapak Q column and a microcoulometric gas chromatograph. It is based on the volatility of the solvent residues, their relative retention times on a polyaromatic bead chromatographic column, and their detectability using a halide-specific microcoulometric method. The system is linear for all three solvents. Six collaborators obtained recoveries ranging front 72.8 to 91.4% The lower recoveries are attributed primarily to the volatility of the solvents, delay in analysis, and titration cell disruption by solvent front. It is recommended that the method be adopted as official first action for ethylene dichloride and trichloroethylene and that methylene chloride be subjected to further study.

Gas Chromatographic Determination of Ethyl O,O-Dimethyldithiophosphoryl- 1-Phenyl Acetate in Technical Grade Cidial and Its 50% Liquid Formulation

1969 ◽  
Vol 52 (1) ◽  
pp. 52-55
Author(s):  
B Bazzi ◽  
L Abbruzzese ◽  
G Galluzzi
Keyword(s):  
Thermal Conductivity ◽  
Chromatographic Method ◽  
Internal Standard ◽  
Chromatographic Determination ◽  
Phenyl Acetate ◽  
Thermal Conductivity Detector ◽  
Liquid Formulation ◽  
Technical Grade ◽  
Gas Chromatographic Method

Abstract A gas chromatographic method has heen developed for analysis of ethyl O,O-dimethyldithiophosphoryl- 1-phenyl acetate. The insecticide or a convenient amount of an insecticidal preparation is dissolved in toluene, together with a suitable internal standard, and analyzed by gas chromatography, using a thermal conductivity detector. The precision (P = 0.05) of the method is ±1.5% of the concentration found.

Gas Chromatographic Determination of O,O-Diethyl S-(N-Isopropylcarbamoylmethyl) Phosphorothiolothionate (Prothoate) in Technical Products and Liquid Formulations

1972 ◽  
Vol 55 (6) ◽  
pp. 1336-1338
Author(s):  
Brunetto Bazzi ◽  
Guglielmo Galluzzi ◽  
Luigi Abruzzese
Keyword(s):  
Thermal Conductivity ◽  
Gas Chromatography ◽  
Chromatographic Method ◽  
Concentration Level ◽  
Internal Standard ◽  
Chromatographic Determination ◽  
Thermal Conductivity Detector ◽  
Gas Chromatographic Method ◽  
Technical Products

Abstract A gas chromatographic method has been developed for the analysis of O,O-diethyl S-(N-isopropylcarbamoylmethyl) phosphorothiolothionate . The acaricide or a convenient amount of an acaricidal preparation is dissolved in xylene, together with malathion as an internal standard, and analyzed by gas chromatography, using a thermal conductivity detector. The precision (P = 0.05) of the method is ±1.5% of the concentration level.

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