摘要:

AbstractA GC/MS technique that provides quantitative and qualitative information on diesel fuel components in drilling muds is described. Several low molecular mass aromatic components of diesel fuel are identified as indicators of diesel fuel. The presence and relative concentration of these indicators is used to identify diesel fuel contamination. This information can be used to approximate the amount of diesel fuel contamination in off‐shore drilling discharge

ISSN:0935-6304    

DOI:10.1002/jhrc.1240080102

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

年代:1985

数据来源: WILEY

ISSN:0935-6304    

DOI:10.1002/jhrc.1240080103

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

年代:1985

数据来源: WILEY

摘要:

AbstractA method is described for the analysis of contaminated building dust samples and surface swab samples for octachlorodibenzo‐p‐dioxin (OCDD) and heptachlorodibenzo‐p‐dioxins (HpCDDs). The samples were analyzed by fused silica capillary GC combined with electron capture detection. Analysis was preceded by a short HPLC cleanup step designed to remove polychlorinated biphenyls (PCBs) and other compounds that might interfere. The method was found to work successfully on surface swab and dust samples known to contain PCBs, OCDD, and HpCDDs. The overall recovery of the analysis procedure for OCDD was found to be approximately 80%. The detection limit for the method was sample dependent, but for one typical set of surface swab samples was 0.2 μg/m

ISSN:0935-6304    

DOI:10.1002/jhrc.1240080104

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

年代:1985

数据来源: WILEY

摘要:

AbstractCosmetic creams were analyzed for their content of jojoba wax and shea fat using anticircular HPTLC, a fast, precise, and reliable method. After optimization of the solvent system (petrol ether/diethyl ether) for the separation of jojoba wax and shea fat, the spots were visualized with phosphomolybdic acid by the “dip‐in” technique, subsequently heated, and finally recorded by scanning with a densitometer at 546 nm. Results showed that one particular concentration range gives an optimum correlation between calibration curves and sample evalua

ISSN:0935-6304    

DOI:10.1002/jhrc.1240080105

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

年代:1985

数据来源: WILEY

摘要:

AbstractThe capabilities of a preparative chromatograph assembled at moderate cost from commercially available components are examined in relation to the purification of β‐lactam derivatives. It is shown that high efficiency separations can be achieved rapidly, economically, and on a scale sufficient to provide adequate quantities of material for spectroscopic identification and biological testing. In the synthesis of a large batch of aminopropyl silica for preparative HPLC purification of an impure sample of cephacetrile, three different grades of silica were investigated. The material giving the best performance was prepared on a 100 g scale and baseline separations for 0.5 g loadings of the impure cephacetrile were obtained on a 30 cm × 2.2 cm i.d. column. The pure cephalosporin was recovered in high yield by freeze drying of the elu

ISSN:0935-6304    

DOI:10.1002/jhrc.1240080106

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

年代:1985

数据来源: WILEY

ISSN:0935-6304    

DOI:10.1002/jhrc.1240080107

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

年代:1985

数据来源: WILEY

ISSN:0935-6304    

DOI:10.1002/jhrc.1240080108

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

年代:1985

数据来源: WILEY

ISSN:0935-6304    

DOI:10.1002/jhrc.1240080109

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

年代:1985

数据来源: WILEY

ISSN:0935-6304    

DOI:10.1002/jhrc.1240080110

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

年代:1985

数据来源: WILEY

ISSN:0935-6304    

DOI:10.1002/jhrc.1240080111

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

年代:1985

数据来源: WILEY