摘要:

The retention data for benzene, toluene, naphthalene, cumeme, biphenyl, and durene in ternary (methanol, tetrahydrofuran, water) and quaternary (methanol, tetrahydrofuran, acetonitrile, water) solvent systems has been reduced to linear equations relating the retention volume to solvent composition. In particular, attention is focused on the biphenyl, naphthalene, cumene system and comments are made as to the optimum separation conditions.

ISSN:0003-2719    

DOI:10.1080/00032718308065178

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

An electrochemical flow cell has been developed using reticulated vitreous carbon (RVC) coated with a thin film of mercury. The flow cell and electrode components are inexpensive and easily constructed. Reproducible results have been obtained for concentrations as low as 100 ppb. Peak currents were dependent on flow rate, electrode size, and mercury deposition time. Oxygen interference was reduced by nitrogen purging to enable analysis of sub-ppm metal concentrations. The cell was tested as a detector for metal complexes eluated from a modified gel permeation chromatographic column.

ISSN:0003-2719    

DOI:10.1080/00032718308065179

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

Scandium was extracted at pH 5.0 from 0.01 M malonic acid on silica gel column impregnated with Amberlite LA-1. Nickel, zinc, cadmium, mercury, lead, tin, aluminium, and lanthanum in binary mixtures because they could not form malonato complexes. It was separated by the process of selective elution from elements such as zirconium, thorium, uranium, iron(III), gallium, indium, cerium(III), litanium by exploiting difference in stability of malonato complexes. Scandium was separated from multicomponent mixture containing yttrium, titanium, zironium, thorium, uranium and aluminium by a process of selective sorbtion and selective elution.

ISSN:0003-2719    

DOI:10.1080/00032718308065180

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

A simple zone melting apparatus has been constructed for purification of low melting [<230°C] organic compounds. Six hydrocarbons were doped with benzo[e]pyrene and the purity of the refining process was monitored by high pressure liquid chromatography. In all cases presented the purity achieved was greater than one part per billion.

ISSN:0003-2719    

DOI:10.1080/00032718308065181

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

A desorption-injection apparatus providing a convenient inexpensive means to transfer preconcentrated volatile mixtures from a sorbent polymer trap onto a GC column without interruption of the operation of the gas chromatograph is described. Thermal desorption is accomplished by resistive heating of a stainless steel trap. Performance of the apparatus was evaluated with data from a known volatile mixture obtained by both desorption-injection and by direct injection.

ISSN:0003-2719    

DOI:10.1080/00032718308065182

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

The reaction of o-phthaldialdehyde with alkyl thiols and amino acids is well known. This method has been used to determine the concentration of taurine4and pico mole levels of amino acids5by liquid chromatography of the substituted isoindole formed. However, alkyl thiols are volatile and have noticeable odors. It was not known if this reaction works with arylthiols. Several aromatic thiols were investigated and triphenylmethanethiol which is a solid was found to react to give a fluorescent product which is most likely a substituted indole. The indole formed was studied with respect to stability as a function of time ans simplex optimization was used to study the factors involved in the derivatization reaction.

ISSN:0003-2719    

DOI:10.1080/00032718308065183

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

Acid decomposition with nitric, perchloric and/or hydrofluoric acids is used to extract selenium from marine geological materials. Selenium is isolated from potentially interfering elements by coprecipitation with lanthanum hydroxide, then a piazselenol is formed between 2, 3-diaminonaphthalene at pH 1.0 and extracted into cyclohexane. The selenium is determined fluorimetrically in the extract. The detection limit is 3.2 ng (four times the standard deviation of blank) and the coefficient of variation is 5% at the 10 ng level. The sample decomposition procedure is evaluated and typical results obtained for selected samples are given.

ISSN:0003-2719    

DOI:10.1080/00032718308065184

出版商:Taylor & Francis Group    

年代:1983

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:10.1080/00032718308065177

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor