摘要:

Thermodynamic quantities were determined for the extraction of ion pairs of tris(1,10-phenanthroline) iron(II) chelate cations with halide, thiocyanate and perchlorate anions from aqueous phase into nitrobenzene. Ion pairs with larger anions have more negative enthalpy changes with higher extractability. For bromide, the enthalpy change was found to be almost zero and a positive change was observed for chloride. Entropy changes are also discussed.

ISSN:0003-2719    

DOI:10.1080/00032716908051265

出版商:Taylor & Francis Group    

年代:1969

数据来源: Taylor

摘要:

The solvent extraction of molybdenum with o,o,s-tripropyldithiophosphate from hydrochloric acid has been studied. The extractable species is H2[MoOCl5] .2 (C3H7O)2-P(S)SC3H7and the thiophosphate can be used to separate molybdenum from Th, Zr, Ti4+, V5+, Nb, Ta, Cu2+, Fe2+, Co2+, Ni and Mn2+.

ISSN:0003-2719    

DOI:10.1080/00032716908051266

出版商:Taylor & Francis Group    

年代:1969

数据来源: Taylor

摘要:

The uranyl-alizarin fluorine blue chelate complex shows an absorption peak at 560 nm, 30 nm higher than that of any other single metal complex of the reagent. The complex shows, at pH 4.5, a conditional stability constant of 2.3 × 106litres mole−1and molar absorptivity of 4100 litres mole−1cm−1. Study of the feasibility of using this reaction for the photometric determination of Uo2+2in both one and two liquid phase systems reveals serious interference from other metal ions.

ISSN:0003-2719    

DOI:10.1080/00032716908051267

出版商:Taylor & Francis Group    

年代:1969

数据来源: Taylor

摘要:

A multiple internal reflectance method and a chemical method for the quantitative determination of poly(vinyl acetate) binder on non-woven polyester battings are described. The band assignments, poly (vinyl acetate) concentration, and standard battings preparation are discussed.

ISSN:0003-2719    

DOI:10.1080/00032716908051268

出版商:Taylor & Francis Group    

年代:1969

数据来源: Taylor

摘要:

The pK values of some weak acids were measured using the hydrogen electrode in liquid ammonia containing 0.1Mpotassium iodide supporting electrolyte at −60°C. The results showed that acetone (pK = 22.5), aniline (pK = 28.8), and 4-chloroaniline (pK = 27.4) were weaker acids than water (pK = 18.9), while thiophenol, diphenyl thiourea, thiocarbohydrazide (pK<2), phenol (pK = 3.5), phenylthio-urea (pK = 3.8), thioacetamide (pK = 4.6), thiosemicarba-zide (pK1= 4.7; pK2= 8.5), thiosinamine (pK = 6.6), diphenylurea (pK = 7.0), diphenylsemicarbazide (pK = 7.6), diphenylguanidine (pK = 10.7), and diphenylcarbazone (9.5<pK<11) were stronger than water.

ISSN:0003-2719    

DOI:10.1080/00032716908051269

出版商:Taylor & Francis Group    

年代:1969

数据来源: Taylor

摘要:

Fluorometric methods are described for the assay of ethanol, methanol, allyl alcohol and n-propanol using the enzyme alcohol oxidase. The enzyme catalyzes the oxidation of the alcohols to aldehydes with concomitant formation of hydrogen peroxide. The hydrogen peroxide formed is measured fluorometrically using p-hydroxy-phenylacetic acid and peroxidase. From 0.1–100 μg/ml of the alcohols and from 0.0002 to 0.050 unit/ml of alcohol oxidase can be assayed in 2 minutes with a precision of about ± 2%.

ISSN:0003-2719    

DOI:10.1080/00032716908051270

出版商:Taylor & Francis Group    

年代:1969

数据来源: Taylor

摘要:

A non-destructive procedure for the determination of iridium, sodium, nickel, cobalt, and scandium in a single meteorite sample is presented. The method utilizes neutron activation followed by gamma-gamma coincidence spectrometry. Iridium abundances are given for several meteorites and compared to values obtained by radiochemical separation methods. The non-destructive results differ significantly from previously published values for certain classes of meteorites, in particular the enstatite chondrites.

ISSN:0003-2719    

DOI:10.1080/00032716908051271

出版商:Taylor & Francis Group    

年代:1969

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:10.1080/00032716908051264

出版商:Taylor & Francis Group    

年代:1969

数据来源: Taylor