Gas chromatography retention time

Gas chromatography retention time of PCB congener relative to the retention time of the reference standard octachloronaphthalene on a capillary column of SE-54. Gas chromatography peak area response of PCB relative to peak area of 1 ng octachloronaphthalene. 

Allyl disulphide (diallyl disulphide) [2179-57-9] M 146.3, 58-59°/5mm, b 79-81°/20mm, 138-139°/atm, d 1.01, no 1-541. Purified by fractional distn until their molar refractivities are in uniformly good agreement with the calculated values [JACS 69 1710 7947]. Also purified by gas chromatography [retention times JOC 2A 175 1959 UV JCS 395 7949]. 

Figures 1,2, and 3 are provided to illustrate one protocol often used to evaluate sink materials [20,32,42-47] however, other methods are also used. For example, Krebs and Guo [48] reported on a unique method involving two test chambers in series. The first chamber is injected with a known concentration of a pollutant (in this case, ethylbenzene). The outlet from the first chamber provides a simple first-order decay that is injected into the inlet of the second chamber that contains the sink material (gypsum board). Thus, this method exposes the sink test material to a changing concentration typical of many wet VOC sources. The sink adsorption rate and desorption rate results are comparable to one-chamber tests and are achieved in a much shorter experimental time. Kjaer et al. [31] reported on using a CLIMPAC chamber and sensory evaluations coupled with gas chromatography retention times to evaluate desorption rates. Finally, Funaki et al. [49] used AD PAG chambers and exposed sink materials to known concentrations of formaldehyde and toluene and then desorbed the sinks using clean air. They reported adsorption rates as a percentage of concentration differences.

There have been numerous attempts to determine HLB numbers from other fundamental properties of surfactants, e.g., from cloud points of nonionics (Schott, 1969), from CMCs (Lin, 1973), from gas chromatography retention times (Becher, 1964 Petrowski, 1973), from NMR spectra of nonionics (Ben-et, 1972), from partial molal volumes (Marszall, 1973), and from solubility parameters (Hayashi, 1967 McDonald, 1970 Beerbower, 1971). Although relations have been developed between many of these quantities and HLB values calculated from structural groups in the molecule, particularly in the case of nonionic surfactants, there are few or no data showing that the HLB values calculated in these fashions are indicative of actual emulsion behavior. 

Proton and Nuclear Magnetic Resonance Signals and Molecular Assignments for the Methyl Ester Product with Gas Chromatography Retention Time of 18 min... 

Zinc and a nickel complexes have been tested as stationary phases for ligand-exchange gas chromatography. Retention time and selectivity were affected greatly by simply coating about 5% of material on Chromosorb. These compounds were found suitable to separate efficiently polycyclic aromatic hydrocarbons and dialkylsulfides. ... 

ADyldisuffide (diallyl disulfide) [2179-57-9] M 146.3, b 58-59 /5mm, 79-81 /20mm, 138-139"/atm, d 5 1.01, n 1.541. Purify the disulfide by fractional distillation until the molar refractivity is in uniformly good agreement with the calculated value [Small et al. JAm Chem Soc 69 1710 1947. It has also been purified by gas chromatography [retention times Carson Wong J Org Chem 24 175 1959, UV Koch J Chem Soc 395 1949], It is present in garlic. [Beilstein 1IV 2098.]... 

Table 4.10 Gas chromatography, retention times for organic peroxides ...

Table 1.9 - Gas Chromatography Retention Times for Organic Peroxides... 

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