摘要:

AbstractVarious methods of gas chromatographic analysis at high resolution and low detection limits in aqueous solutions are described with regard to sampling techniques, column technology, and the application of coupled pre‐columns, also including multidimensional methods. Immobilized polyethylene glycol (Carbowax 20 M) columns have also been produced and used successfull

ISSN:0935-6304    

DOI:10.1002/jhrc.1240070102

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1984

数据来源: WILEY

摘要:

AbstractA crosslinkable biphenylmethylpolysiloxane stationary phase was synthesized for capillary column gas chromatography and compared with methyl, phenyl, and cyanopropyl polysiloxane stationary phases for the separation of isomeric polycyclic aromatic compounds. While the new phase gave similar separations of nonpolar isomers when compared to the nonpolar phases, separations of polar isomers were greatly improved because of the induced polarity of the biphenyl group of the stationary phase by the solute molecules. This polarizable stationary phase offers a unique selectivity which is not available in other stationary phases.

ISSN:0935-6304    

DOI:10.1002/jhrc.1240070103

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1984

数据来源: WILEY

摘要:

AbstractA conventional splitless injector is used as a pyrolysis chamber or chemical reactor for theN‐demethylation of acetylcholine and other choline esters. The novel uses of 2‐aminoethanol as aN‐demethylation reagent in splitless injection and bonded‐phase fused silica capillary columns in the separation of the tertiary amine derivatives of choline esters are described. A comparison is made between non‐polar and moderately polar fused silica capillary columns in the separation of choli

ISSN:0935-6304    

DOI:10.1002/jhrc.1240070104

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1984

数据来源: WILEY

摘要:

AbstractThe environmentally hazardous organic substances in the waste water from the manufacture of chlorophenoxyalkanoic acids have been identified and semiquantified before and after passing through a biological treatment plant for municipal sewage, the secondary effluent of which is discharged into a marine ecosystem. The organics belong to three groups: (i) chlorophenols; (ii) chlorophenoxyalkanoic acids; and (iii) chlorinated neutrals. The removal of chlorophenols and phenoxyalkanoic acids was shown to be good, with a 90% overall reduction of chlorinated substances in the sewage passing through the treatment plant. The lowest reduction occurred for the polychlorinated compounds. Two chlorobenzofurans among the chlorinated neutrals were preliminarily identified.

ISSN:0935-6304    

DOI:10.1002/jhrc.1240070105

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1984

数据来源: WILEY

摘要:

AbstractAlthough chlorinated paraffins (CP) are produced in large amounts (300 000 tonnes per year), little is known about their occurrence in the environment due to the lack of specific and sensitive analytical methods. The present paper describes the GC/MS analysis of different CP's using capillary gas chromatography with on‐column injection and negative ion chemical ionization (NCI) mass spectrometry. Chromatographic resolution of groups of isomers and homologues was obtained. The chromatograms and mass spectra are discussed. The suitability of this method for trace analysis of a CP sample using multiple ion detection (MID) is describe

ISSN:0935-6304    

DOI:10.1002/jhrc.1240070106

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1984

数据来源: WILEY

摘要:

AbstractEnantiomeric amide derivatives of (S)‐ and (R)‐1‐phenyl‐2‐aminopropane (dextro‐ and levoamphetamine, respectively) were resolved by high performance liquid chromatography on commercially available ionically and covalently bonded chiral stationary phases ((R)‐N‐(3,5‐dinitrobenzoyl)phenylglycine). Ten enantiomeric amide pairs were synthesized and chromatographed on the columns by using a mobile phase of hexane‐isopropanol (97 : 3), a flow rate of 2 ml/min, and a column temperature of 20°C. The (R)‐isomer of all 10 amides eluted first on the covalent column as did the (R)‐isomer of nine derivatives on the ionic column. however, the 3,5‐dinitrobenzoyl amide of (S)‐ amphetamine eluted before the (R)‐isomer on the ionic column. This reversal in enantiomeric elution order reveals the complexity of the interactions occurring on these columns and emphasizes the hazards of relying on observed elution order as ana prioriindica

ISSN:0935-6304    

DOI:10.1002/jhrc.1240070107

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1984

数据来源: WILEY

ISSN:0935-6304    

DOI:10.1002/jhrc.1240070108

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1984

数据来源: WILEY

ISSN:0935-6304    

DOI:10.1002/jhrc.1240070109

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1984

数据来源: WILEY

ISSN:0935-6304    

DOI:10.1002/jhrc.1240070110

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1984

数据来源: WILEY

ISSN:0935-6304    

DOI:10.1002/jhrc.1240070111

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1984

数据来源: WILEY