摘要:

The combination technique of micro high performance liquid chromatography and inductively coupled plasma atomic emission spectrometry is demonstrated in the separation of organometallic compounds. Problems relating to the interfacing between micro HPLC and ICP would be elininated uti1izing the simple interfacing technique.

ISSN:0003-2719    

DOI:10.1080/00032718208069494

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

摘要:

The negative peak fluorescent detector previously described in this journal by Su and Winefordner1is used now to determine both fluorescent and non-fluorescent polynuclear aromatic hydrocarbons (PAH's). Here we report on limits of detecticn, linear dynamic ranges, calibration curve slopes and chromatographic retention times for several PAH's. We also report on the effect of solvent polarity upon the fluorescence signals when an HPLC separation is performed using a reversed phase packing and a polar solvent containing a fluorescent tag. The negative peak fluorescent detector is also shown to be useful in solvent programming studies.

ISSN:0003-2719    

DOI:10.1080/00032718208069495

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

摘要:

A scheme for the TLC separation of seven Antihistamines on silica gel metal salt impregnated plates by using a mixture of Ethanol-DMF-ammonia (32:10:0.2) as developing system and employing Dragendroff reagent as visualization reagent is described.

ISSN:0003-2719    

DOI:10.1080/00032718208069496

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

摘要:

The enantiomeric purity of a series of polyester model compounds has been assayed by NMR spectroscopy, using chiral lantha-nide shift reagents. The dependencc of proton and13C NMR spectra on concentration and temperature has been investigated.

ISSN:0003-2719    

DOI:10.1080/00032718208069497

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

摘要:

Molecular fluorescence is much in use nowadays as an analytical technique, particularly for the determination of traces of toxic fluorescent substances. The authors describe a spectrofluorimetric method, called the synchronous excitation method, which is more sensitive and more selective than the classical spectrofluorimetry and which can be used for the direct determination, in the presence of other hallucinogens, of LSD in confiscated samples. They also propose the application, under certain conditions, of the method as a rapid test for the presence of LSD.

ISSN:0003-2719    

DOI:10.1080/00032718208069498

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

摘要:

Improvements to the thiocyanate colorimetric procedure for analysis of ppm levels of molybdenum have been made. The complete procedure was studied and revisions made to the solvent extraction system to increase sensitivity. The solvent itself was stabilized by elution through an adsorption column. Revisions to the fusion procedure were made to eliminate hand fusion of samples. The use of desiceants for solvent drying was replaced by filtration before absorbance readings to eliminate turbidity. Total solution of rock samples requires a special digestion procedure with atomic absorption finish.

ISSN:0003-2719    

DOI:10.1080/00032718208069499

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

摘要:

When a solution containing a single monobasic weak acid is titrated potentiometrically with a strong base, non-linear regression analysis of the data yields a random scatter of the residuals around the best fit to the appropriate equation. If the same equation is used when a second weak acid is also present, systematic errors arise and yield a deviation plot having a characteristic shape. If the amplitude of that plot is substantially larger than the random error of measurement, the presence of the second acid can be detected, and its concentration can then be evaluated by non-linear regression onto the equation that takes its presence into account. The amplitude increases as the relative concentration of the second acid increases, and as the difference between the values of pKafor the two acids increases. Examination of these dependences shows, for example, that it should be possible to detect 1 per cent of an impurity for which pKadiffers by 0.57 unit from that of the major component.

ISSN:0003-2719    

DOI:10.1080/00032718208069500

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

摘要:

This is a scanned image of the original Editorial Board page(s) for this issue.

ISSN:0003-2719    

DOI:10.1080/00032718208069493

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor