摘要:

AbstractPyrogallolsulfonephthalein (abbreviated to PR) and its thorium chelate was spectrophotometrically studied in perchloric acid and perchlorate solution at variouspH's. PR shows an absorption maximum at 478 mμ. atpH 3.0, which in the presence of thorium (IV) ion shifts to 544 mμ. The optimumpH for the formation of the chelate was found to be 2.7 to 3.2 and the mole ratio of Th(IV) to PR was 1:1. The instability constant was found to be 1.40×10−16at ionic strength, μ

ISSN:0009-4536    

DOI:10.1002/jccs.196300021

出版商:WILEY‐VCH Verlag    

年代:1963

数据来源: WILEY

摘要:

AbstractA rapid method for the determination of thoria content in Taiwan monazite sand and its associated minerals, zircon, and ilmenite, is presented. The method is gamma scintillation spectrometric, taking the area under the composite photopeak of Ra‐224 (0.241Mev) and Pb‐212 (0.239Mev) as a measure of the thoria content. It is applicable to minerals with thoria content ranging from 10% to 0.01%. The relative standard deviation is 3%. A determination can be made within one hour directly on the sam

ISSN:0009-4536    

DOI:10.1002/jccs.196300022

出版商:WILEY‐VCH Verlag    

年代:1963

数据来源: WILEY

摘要:

AbstractThe sorption of radiocesium (Cs‐134) by seven different samples of soil has been studied over a widepH range (0–14). In general, the sorption is excellent except in the lowpH region. The presence of 0.01NNa+, Mg++, Ca++, Sr++, Ba++and Al+++does not seem to influence either the uptake of radiocesium by, or the extraction of the sorbed radiocesium from, Red soil and Yellow s

ISSN:0009-4536    

DOI:10.1002/jccs.196300023

出版商:WILEY‐VCH Verlag    

年代:1963

数据来源: WILEY

摘要:

AbstractIn order to investigate the feasibility of producing enriched Co‐69 activity by Szilard‐Chalmers process, the complexes tris‐[1‐nitroso‐2‐naphthol] Co(III) (A), tris‐ethylenediamine Co(III) chloride (B) and potassium cobalticyanide (C) have been prepared and used for investigation. The percentage activity yield and enrichment factor for each complex have been estimated. The observed highest values of enrichment factor for the complexes (A), (B) and (C) were 287, 18.8 and larger than 3,300

ISSN:0009-4536    

DOI:10.1002/jccs.196300024

出版商:WILEY‐VCH Verlag    

年代:1963

数据来源: WILEY

摘要:

AbstractFourteen open‐chain hexaatomic π‐orbital systems with one heteroatom are treated with the Hückel theory. From solutions of the secular equations, the dependence of π‐orbital energy levels on the heteroatom's Coulomb integral is studied. Applications to π‐bond energies, activation energies, and ultraviolet absorption maxima ar

ISSN:0009-4536    

DOI:10.1002/jccs.196300025

出版商:WILEY‐VCH Verlag    

年代:1963

数据来源: WILEY