摘要:

AbstractThe polarography of uranium in antipyrine solutions was studied in detail. A reversible and diffusion controlled wave was obtained overpH 1.5 to 4.7 and antipyrine concentration ranging from 0.016Mto 0.631M. AtpH between 2.3 and 4.7, the half‐wave potential wasindependent ofpH value. AtpH lower one hydrogen than 2.3, ion was involved in the reduction. The U(VI)‐antipyrine compound was found to be a chelate species of UO2A2+2and UO2A2+2in antipyrine of concentratration lower than 0.155Mand atpH 3.5, but was a simple complex species of UO2AG+2in antipyrine of concentration higher than 0.155M. The value ofia/Cis constant at 2.7 and 3.2 forpH value 2.0 and 3.5 respectively, over a 4.4 × 10−4Mto 5.5 × l0−3Mrange of uranium conc

ISSN:0009-4536    

DOI:10.1002/jccs.196300009

出版商:WILEY‐VCH Verlag    

年代:1963

数据来源: WILEY

摘要:

AbstractSeparation factors for La, Ce, and Pr have been measured precisely on columns of bis [2‐ethylhexyl] orthophosphoric acid (DEP) supported on diatomaceous silica made hydrophobic with dimethyldichlorosilane. Column behavior is related to the properties of DEP when used as a solvent extractant, and the column method is a useful one for studying a solvent extraction system with great precision and reproducibility. Separation factors measured are Ce/La = 2.8 ± 0.1 and Pr/Ce = 2.7 ± 0.1. The dependence of elution volume on HCl activity is found to be approximately 2.5 power in the range 0.2–0.

ISSN:0009-4536    

DOI:10.1002/jccs.196300010

出版商:WILEY‐VCH Verlag    

年代:1963

数据来源: WILEY

摘要:

AbstractA simple and rapid procedure is presented for the determination of 1–10mgof tannins. It is based on the precipitation of the tannin‐uranium complex and the measurement of the radioactivity of the precipitate. This micromethod is shown to be superior to procedures depending on gravimetry, titrimetry, colorimetry, or spectrophotome

ISSN:0009-4536    

DOI:10.1002/jccs.196300011

出版商:WILEY‐VCH Verlag    

年代:1963

数据来源: WILEY

摘要:

AbstractThe contents of Br and I in commercial sodium glutamate and cassava flour were determined by neutron activation analsis at the Tsing Hua Reactor. The conventional carbon tetrachloride extraction method was employed for the analysis of these elements. It was found that the content of Br varied widely between 0.003 and 0.1ppm, while that of I varied between 0.06 and 0.7ppm, in six samples of sodium glutamate. Two samples of cassava flour were found to contain 0.1 and 0.2ppmof Br, and 0.02 and 0.04ppm. of I, respectively. The higher contents of these elements in come glutamate samples as compared with the raw material was considered to be the contamination from chemicals used in the production processes.

ISSN:0009-4536    

DOI:10.1002/jccs.196300012

出版商:WILEY‐VCH Verlag    

年代:1963

数据来源: WILEY

摘要:

AbstractPetroleum cokes, made from gas oil fraction of crude oil produced in different oil fields in Taiwan, were analyzed inppmlevel for boron, vanadium, titanium, iron, calcium, aluminium, magnesium, chromium, cobalt, manganese, nickel, molybdenum, and copper.

ISSN:0009-4536    

DOI:10.1002/jccs.196300013

出版商:WILEY‐VCH Verlag    

年代:1963

数据来源: WILEY

摘要:

AbstractInfrared absorption spectra of nineteen 6‐halogeno‐flavonoids in KBr disks are observed with an INFRACORD Spectrophotometer. Absorption bands in the regions 350C‐1400cm−1and 1000–650cm−1ar

ISSN:0009-4536    

DOI:10.1002/jccs.196300014

出版商:WILEY‐VCH Verlag    

年代:1963

数据来源: WILEY

摘要:

AbstractThrough the comparison of spectra of fourty‐nine halogeno‐flavonoids, the origin of the main absorption bands between 1400cm−1and 1000cm−1is investigated. In addition to various C‐H in‐plane deformation bands, ten kinds of vibrations are tentatively assigned by way of correlating the spectra and structures of these

ISSN:0009-4536    

DOI:10.1002/jccs.196300015

出版商:WILEY‐VCH Verlag    

年代:1963

数据来源: WILEY

摘要:

AbstractChamaecin was confirmed to be4‐isopropylsalicylaldehyde by comparison with the synthetic compound, which was prepared by the oxidation of carvacrol methyl ether with manganese dioxide in 30% sulfuric acid followed by the hydrolysis with alumnium bromide incarbon disulfide solutio

ISSN:0009-4536    

DOI:10.1002/jccs.196300016

出版商:WILEY‐VCH Verlag    

年代:1963

数据来源: WILEY

摘要:

AbstractSome modifications on the preparation of thin‐layer were made. By using the modified thin layer, the time required for development was shortened to one to two hours. Temperature and humidity effects for the thin‐layer formation are discussed. Small plates with the dimension 5×5cmwere prepared for horizontal development for preliminary solvent and color tests.The crude extractives of leaves of six plants, comprising Evodia glauca Miq., Glycosmis cochinchinensis Pier, Clausena lumulata Hayata, Atalantia buxifolia Oliver, Pittosporum formosanum Hayata, and Murraya paniculata Jack., were investigated by polyamide thin‐layer chromatography. It was observed that the crude extractives gave satisfactory chroma

ISSN:0009-4536    

DOI:10.1002/jccs.196300017

出版商:WILEY‐VCH Verlag    

年代:1963

数据来源: WILEY

摘要:

AbstractThe technique of thin‐layer chromatography has been applied to the separation and identification of some tropolones on phosphoric acid impregnated, non‐bound cellulose powder. This method is simple, rapid and effective,Rj‐values of ten natural occurring tropolones are reported. The presence of ϵ‐thujaplicinol, ϵ‐ and γ‐thujaplicin in the wood extract ofLibocedrus formosan

ISSN:0009-4536    

DOI:10.1002/jccs.196300018

出版商:WILEY‐VCH Verlag    

年代:1963

数据来源: WILEY