Summaries for card indexes

Summaries for card indexes

SUMMARIES FOR CARD INDEXES The role of 70-W % perchloric acid as oxygen donor and the oxidation potentials made available: G. FREDERICK SMITH, Tufun...

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SUMMARIES

FOR CARD INDEXES

The role of 70-W % perchloric acid as oxygen donor and the oxidation potentials made available: G. FREDERICK SMITH, Tufunta, 1968, 15, 489 (Noyes Chemical Laboratories, University of Illinois, Urbana, Illinois, U.S.A.) Sunnna~-A study has been made of the probable oxidation potentials provided by perchloric acid in the concentration range 70-80%. The effect of acid concentration and temperature on the oxidation of chromium, vanadium, cerium, and manganese has been investigated. Available oxidation potentials appear to be 2.0-2.1 V or higher. The monohydrate of perchloric acid, HCIO,*HIO, containing 84.6% of perchloric acid, has been made commercially available and authorized for distribution by common carrier. It can be diluted to give acid concentrations from 73.6% (corresponding to HClO,*ZH,O) upwards. Perchloric acid mixed with sulphuric acid is equivalent to high concentrations of perchloric acid and can be used for dissolution of ores and destruction of organic matter.

Isolation of osmim and ruthenim by ion-exchange paper and subsequent determination by X-ray fluorescence: H. TAYLORand F. E. BEAMR~H, TuZunta, 1968, 15, 497 (Department of Chemistry, University of Toronto, Toronto 5, Ontario, Canada.) Sunnnary_Quantitative separations of microgram quantities of osmium and ruthenium from large proportions of copper, iron and nickel were accomplished by the use of anionexchange paper. Accurate determinations of osmium and ruthenium were made by adaptation of X-ray fluorescence. Wet methods for the dissolution of the paper and exchanger and subsequent wet determinations of osmium and ruthenium are discussed.

Metal chelate exchange in the organic phase-II. Extraction and exchange constants of ditbizonates and diethyldithiocarbamates: J&l STAR* and JAROM~R RMICKA, Tuhntu, 1968, 15, 505 (Department of Nuclear Chemistry, Faculty of Technical and Nuclear Physics, Prague 1, Btehovb 7, Czechoslovakia.) Snmmary_Dithizonates and diethyldithiocarbamates of Ag, Tl(I), Cu(II), Zn, Cd, Hg(II), Pb, Fe(II), Co(E), Ni, Pd(II), In(III), As(III), Sb(III), Bi, Se(IV) and Te(IV) have been prepared and their reactions in carbon tetrachloride have been studied spectrophotometrically. From the exchange constants determined, the extraction constants of metal diethyldithiocarbamates have been calculated. Where formation of mixed chelates has been observed, corresponding exchange constants have been determined. Finally, the influence of organic solvents (CC&, CHCl*, C,H, and C*H,Cl) on the exchange reaction of zinc diethyldithiocarbamate with dithizone has been investigated. i

ii

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POJIb 70-80x XJIOPHOm ICBCJIOTbI ICAK AAPBTEJIH HllCJIOPO,I&A &I AOCTYIIHbIE IIOTEHqHAJIbI OICHCJIEHI,IH : G. FREDERICK SMITH, Tahta,

1968, 15, 489.

Pemmt+-llayqeHn BoaMolfCHbIe noTeaqnanu 0KncJIeHnq nonyYaemre XJI~~HO~~KI~CJI~TO~~ B npegenax KoHqempaqm 70-80 %. klccnenoBaK0 BnMIIHIle KoHQeHTpalIIllrKElCJIOTbI Ii TeMnepaTypbl ~aoK~cneH~expoMa,BaH~~rr,qep~s MMapraHaa. AOCTyHHbIe nOTeHIjElaJIbIOKIICJIeHIIfl OKaWIBaJOTCH 2,0-2,1 B ElJIH BbIIIIe. MoHorH~paTxnop~oB~n~n~~bI, HCIO,*H,O, coaep)Kan@ 84,6x xnopaoti KEICJIOT~I, ~~c~yn~b&i ToproBne a TaKme oAo6peHo ero pacnpeAeneHlleHOpMaJIbHbIMnepeBO30M. EeMOmHOpas6aBnaTb YTO6bI nOJIy=IHTb KOHqeIITpaQllH 73,6x (COOTBeTCTByeT HC&O2HaO) M BbIIIIe.CMeCb XJIOpHOi H CepHOa KPICJIOTOTBeTCTByeT B~ICOKHM KoHqeHTpaqtlsM xnop~ot KncjI0~bIIi etfMO~HO nonbBOBaTbCFl @In paCTBOpeHHR pyn II pa8OpeHHR OpraHWIecKHX BeIQeCTB.

BbIAEJIEHHE OCMMH EI PYTEHEIH HA BOHOOBMEHHOm BYMAI’E El&IX HOCJIEAOBATEJIbHOE OI-IPEAEJIEHBE METOAOM PEHTI’EHOBCKOrO QJIYOPECYEHTHOI’O AHAJIBBA: H. TAYLOR and F. E. BEAMISH, Talanta, 1968, 15, 497. Pe3IOM&--KOnWIeCTBeHHOe OTAeJIeHHe MHKpOrpaMMOBbIX KOJIEIYeCTB OCMHFI IIpyTeHVrR OT 6onbnrIlx KOJIEI'4eCTB MeW, H(eJIe3aII HIIKeJIfinony=IeHo HCnOJIb30BaHEleM aHUOHOO6MeHIlOh 6yMarbI. TouHbIe 0npeaeneHaH OCMHFI II pyTeHIlR npoBeneHbI MCTOAOM peHTreHoBcKoro@ryopec~eHTHoroaHan~3a. 06CymHeHbIMeTOAbI ~JIR~~CTBO~~HHFI~~M~~~~EIOH~~~M~HH~IK~O~OCJI~~OB~T~JI~HO~O 0npeaeneHnH oc~~flEipyTeKw10Kpbn4 nyTeh5.

OBMEH XEJIATOB METAJIJIOB B OPI’AHWIECHOfl @A3E-II. KOHCTAHTbI 3)ECTPAHqklH &I OBMEHA ABTB30HATOB B QK3TIUIAHTHOHAP BAMHHATOB: J& STAR+ and JAROM~R RPIZI~KA, Talanta, 1968, 15, 505. Pe3IoMe---npllrOTOBneHU AIlTElBOHaTbIPI AHaTWI~nTnOKap6aMHHaTbIAg,Tl(I), Cu(II), Zn,Cd, Hg(II), Pb,Fe(II), Co(II),Ni, Pd(II), In(III), As(III), Sb(III), Bi, Se(IV) II Te(IV) MHsyseHH B TeTpaXJlOpMeTaHe CneKTpO@OTOMeTlWIeCKHM HX peaqm MeTOAOM. HaOCHOBeOnpe~eneHH~XKOHCTaHTO6MeHaBbIs~CneHn KOHCTaHTbl 3KCTpaKqlllZ ~~3TWl~~TIlOKap6aMHHaTOB MeTaJlJlOB. B CJIy4ae 06pa3oBaHnR CMeIIIaHHbIX XeJIaTOB OnpeAeJreHbI COOTBeTCByIoIlrlleKOHCTaHTbI06MeHa.~OHe9HO,llCCJIeAOBaHOBnllFIHIle opraHHsecKHx pacTBoptlTeneti (Ccl.,,CHCl,,CIHG M C,H,CI)H~ peaKqllI0 06MeHa~I4aT~JI~IITHOKap6aM~HaTa~MHKaC~~TLI8OHOM.

Summaries for card indexes

Metal ion separations

using cellulose phosphate as an ion-exchanger: and JAMESS. FRITZ, T&&z, 1968, 15, 515 (Institute for Atomic Research and Department of Chemistry, Iowa State University, Ames, Iowa, U.S.A.)

DONALD H. Scn~rrr

Snmma~-Cellulose phosphate is used as a chelating ion-exchanger to effect the separation of several metal ions. Its exchange rate is much more rapid than that of a chelating ion-exchanger containing phosphonic acid groups on a polystyrene matrix. Weight distribution coefficients as a function of hydrogen ion concentration on cellulose phosphate are given for several metal ions. Successful separations of rare earths and alkaline earths, alkaline earths and alkali metals and aluminium and alkaline earths have been achieved on cellulose phosphate columns.

Spectrophotometric study of the reaction of iron(III) with Methylthymol Blue: Roars~~v KARADAKOV, DONKA KAIWCHEVA and PETRANA NENOVA, Tuluntu, 1968,15,525 (Department of Analytical Chemistry, Higher Institute of Chemical Technology and Metallurgy, Darvenitza, Sofia, Bulgaria.) Snmmary-The reaction between iron(II1) and Methylthymol Blue (MTB or H,A) has been investigated by spectrophotometry. It has been established that iron(II1) and MTB form two complexes with compositions iron(II1): MTB = 1: 1 and 1: 2. The 1: 1 complex is stable in acidic medium containing excess of iron, and the 1: 2 complex is stable in slightly acidic or alkaline media containing excess of MTB. The absorption maxima are at 61Om,u (1:l) and 515 rnp (1:2), the molar absorptivities being 1.73 rt 0.01 x 10’ and 3.21 f 0.05 x lOa respectively. The nature of the two complexes at pH 6 and the stability constants have been determined: log PI1 = 20.56 & 0.07, log pllB = 43.29 + 0.09, log /I1a = 666 f 0.05.

Catalytic microdetermination of chromimn(VI): T. P. HADJIIOANNOU, Tuluntu, 1968,15,535 (Laboratory of Analytical Chemistry, University of Athens, Athens, Greece.) Snmma~-An automatic spectrophotometric kinetic method for the microdetermination of chromium(V1) is described, based on catalysis of the hydrogen peroxide-iodide reaction. The time required for the reaction to produce a small fixed amount of tri-iodide is measured automatically, and is proportional to the chromium(VI) concentration. Maximum tolerable amounts of various interfering ions were investigated. From 0.6 to 3.0 fig of chromium(V1) can be determined with relative errors of l-2%, with measuring times of 10-50 sec.

AHHOT~IWU eTaTen

PA3AEJIEHklE BClIOJIb30BAHBEM B KAYECTBE

DONALDH. Scmm

HOHOB METAJIJIOB C @OC@ATA ~EJIJIIOJI03bI BOHOOBMEHHBKA:

and J-

S. FRITZ, Tdantu,1968,15, 515.

PeaIoMe--~oc@aToM qennxonoabI lIOJIb8OBaJIuCb B Ka9ecTBe xenupyIoqerouoHoo6MeHHuKa~nspas~eneHuHHeKoTopblxu0~0K MeTaJIJlOB. CKOpOCTbo6MeHa~Ha¶uTeJlbHO6McTpee~eMBCJIy¶ae xenupylorqerouOH006MeHHuKa, CoAepmarqero rpynnb~ +OC+OKuCJfOTblHa MaTpulJe lIOSluCTupOna.npuBeAeH3.d BeCOBbIe Ko8@#iqueHTbI pacnpeneseHuH Ha @oc@aTe qennIonoabIAjIa HeKOTOpbIXUOHOB MeT%'IJIOB B SaBuCuMOCTu OT KOHqeHTpaLWi BoAopoA~b~xuoHoB. IIonyseHbIycneluHbIe pasAeneHuspeAKoaeMeJIbHbIXWIeMeUTOB u JI@IO'JHO'deMeZbHbIX WIeMeHTOB, II&IO9HOSeMeJIbHbIXLWeMeHTOB u IQ&l0WIkJXMeTaJlJIOB u PJIIOMUHURu qe~o~Ho8eMenbHbIxa~eMeHToBHa~0n0~~ax(Poc~aTa qennronbI.

kI3Y=IEHME CHEKTPOQOTOMETPWIECKMM METOAOM PEAKqMEl 3fCEJIE3A(III) C METBJITBMOJIOBbIM CHHLIM: BORISLAVKARADAKOV,DONKA Talanta, 1968,15,525.

KANTCHEVA and PETRANA NENOVA,

Pe~~nl~~C~e~OBaHaC~eKTpO~OTOMeTpu~eCKuMMeTO~OMpeaKIIUHmenesafIII)uMeTunTunfoxoBororonv6oro MTC UJIHH.A). 3iCTaHOBJIeHb~TbmeJle3O(I1I)obpa&?yeTC'MTCABa KOMlIJIeKiak OTHOIIIeHuumeJIeaO(III): hfTC = 1~1 u 1:2. HOMIIJIeKC1:1 RBJIHeTCRyCT0fiWfBbIM B KuCJIbIX CpeAaX COAep%a~uX u86bITOK meaesa, a KOMnneKC 1:2 yCTO&uBb~fi B cna6oKucnbIx UJIU qeaoqanx cpenax CoAepm~Iwix u86bITOKMTC. MaKCuMyMhI CBeTOlIOrJIOIJJeHuHHaXO~FITCHIIpu610 MMK(1:1)u 616MMK(1:2), a MOJIfSpHbJe UornoweHuH paBHbI 1,73 f 0,Ol x 104 II 3,21 f 0,05 f lo*, COOTBeTCBeHHO.OIIpeAeJIeHbI XapaKTepucTuKu KOMnJIeKCOBIIpUpH6 U UX KOHCTaHTbIYCTOtiWiBOCTU:log pip= 20,56 & 0,07,logj3,,, = 43,29 f 0,09, alog & = 6,66 f 0,05.

MMKPOOrIPEfiEJIEHBE KATAJIBTIViECKMM

XPOMA(VI) METOAOM:

T. P. HALNIIOANNOU, TuZuntu,1968,15,535.

PesIOMe-OIIUCaH aBTOMaTuYeCKufd CIIeKTpO~OTOMeTpUYeCKuti KuHeTWieCKutiMeTOA MUKpOOIIpeAeJIeHUR XpOMa(VI), OCHOBMaaro~~@cs Ha KaTanuae peaKquu KepeKucu BoAopona c ~10x0~. ABTOMaTU4eCKU OIlpeneJIeEiO BpeMu IIOTpe6HO,QJIH o6paaoBaHua He6OJIbluerO KOJfU'feCTBa TpuuOfiUAaBTOtipeaKtqUe2t; EJTOBpeMH llpOuOp~UOHaJlbH0KOHlJeHTpaquu XpOMa(VI). OnpeAeneHbI MaKCUManbHbIe TeplIUMbIeKOJIWieCTBapaELJIuqHbIX MemaIOIIJUX uOHOB. BTUM MeTonoM onpeneneH0 0,6 ~0 3,0 MKr xpoMa(IV),c OTHOCuTeJIbHOti OIIIu6KOti 1-2x, a BpeMeHeM U3MepeHUH 10-50 CeK.

Summaries for card indexes

Radiochemische Tremmagen mit Hilfe der Riagofeamethod~lE Die Systeme o”Sr/BOYund 140J3a/140La:D. KLOCKOW,Tulantu, 1968, 15, 541 (Chemisches Laboratorium der Universitgt Freiburg i. Br., Analytiscbe Abteilung, Bundesrepublik Deutschland.) S--Rapid separations of O”Yfrom B”Srand of lroLa from lroBa on carboxymethylcellulose filter papers by the ring-oven technique are described. Highest yields (> 99 % for B0Y and 90% for l@La) and decontamination factors (5 x lOa-IO* for OOYand lo8 for lpoLa) are obtained by using EDTA as complexing agent and water for washing. The half-lives of the daughter-nuclides were found to be 64.7 f 0.3 hr and 40.5 f 0.2 hr for “OY and for lroLa respectively. *OYcan be selectively separated with 85-90 ‘4 efficiency from a mixture of all four nuclides using a 1% solution of hydroxyisobutyric acid at pH 4.8 as eluent.

Simple aad rapid determination of mercury inurine aad tissues by isotope excbaage: T. W. CLARKSON and M. R. GREENWOOD,Talantu, 1968, 15, 547 (Department of Radiation Biology and Biophysics, Atomic Energy Project, University of Rochester School of Medicine and Dentistry, Rochester, New York 14620, U.S.A.) Summary-The method eliminates oxidation of organic material. Tracer quantities of *O*Hg are added to the sample and equilibrated with the stable mercury. *O”Hgvapor in nitrogen is passed through the sample in the presence of cysteine and at pH 7.4, and exchanges with the *OsHg. T’he vapor is collected in a tube of activated Hopcalite placed in a gamma-counter. The increasing activity is recorded and the half-time of exchange is directly proportional to the mercury concentration in the sample. The method is best suited for urine samples containing more than 10 rug Hg/l.

Adsorption of cldoro-complexes of the first row transition elements by Dowex A-l: D. G. BIRNEY,W. E. BLAKE,P. R. MELDRUM and M. E. PEACH, Tufunta, 1968, 15, 557 (Department of Chemistry, University of Technology, Loughborough, U.K.) Summary-A study has been made of the adsorption of chlorocomplexes of the first row transition metals by the chelating resin Dowex A-l, and possible mechanisms for adsorption have been reviewed. Relative adsorption follows the series Zn(I1) > Co(H) = Fe(III) > Cu(I1) > Mn(I1). Negligible adsorption occurred with Cr(II1) and none with V(IV) and Ni(II). Maximum adsorption of Zn(II) occurred from 3M hydrochloric acid and for the other metals from 8M acid.

V

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PAAHOXBMB=IECKBE PA3AEJIEHBR METOAA ICOJIbIJEBO$i I-IEYL/I-III. o”Sr/sOY ICI 1roBa/140La: D. KLOCKOW,

HOMOqbIO CIlCTEMbI

Tulantu, 1968, 15, 541.

Pea~om+Onnca~~o 6bwrpoe pa8AeneHsie O”Y OT 9oSr H laoLa OT 14eBaHa @lUIbTpOBaJlbHOti 6yMareHa Kap60KCHMeTKJnjennIonoabI MeTO~OMKOJIb~eBOfiIIe9H. Hatnysnniesnxo~qna (>99%~~&"Y H99%~~~140La)EI~aKTOp~~eKOHTaMIIH;UIEIEI(6 X 193-104~JIRDoY Ei lo3 AJIR 14'La) nOJIyqeHbI EICIIOJIb8OBaHEleM BnTA B KageCTBe KoMnneKcooGpaayIoqero ~~~AT~KBoAKAJIII~~~M~IBKK. llepnoa nonypacna~aAO~epHbIX HyKJlHAOBpaBHbl64,7 f 0,3%H40,5 * 0,24.AJUIgOYHAJlH 140La,cooTBeTCTBeHH0. soY MOSKHOBhIAenRT C~~~KTE~BHO~B~XO~OM~~-~~~~~~M~~HB~~~~~T~I~~~H~K~H~OB lIOJlb8yfiCbI%-TAbIM paCTBOpOM OKCE'iM8OMaCJlFIHOfi KIlCJlOTbIB KagecTBe xnoewra np~ pH 4,s.

HECJIOXHOE M BbICTPOE OIIPEflEJIEHBE PTYTH B MO=IE B TICAHHX METOAOM OBMEHA HSOTOI-IOB : T. W. CLARKSON

and M. R. GREENWOOD,Tuluntu, 1968,15, 547.

~e3IoM~~eTO~KcK~~¶aeToKHc~eHIleopraHEl¶ecKoroBe~ecTBa. Hpo6n AO6aBJIsIOT MHAUKaTOpHhle KOJIElYeCTBaeosHg II ypaBHOBeIIIIIBaKJT C YCTOltfqllBOlt pTyTbI0. napbI *O"Hg B a8OTe IIpOIIyCKaIOTqepe8paCTBOp npo61~ BlIpKCyTCTBllliqMCTeHHaIIpHpH7,4 HO~M~HJ~H)TC~~~H~. ~apbICO6KpaIOTBTpy6KeM8aKTEZBHpOBaHHero HOllKaJlEITa,CMelqeHHOti B raMMa-Cqi?TqHKe. 3anncaHo ~OBbIIIIeHHeaKTHBHOCTII,a~O~y~epHO~o6MeHa~pO~Op~HOHa~eH KOHqeHTp;UIHEi pTyTH B npo6e. MeTOn OUeHb IIOJIe8HbIti Ai'lR aHaJnf8anpo6~osbI coAepHtaqnx 6onbme 9eM lO~~r/nHg.

AACOPBIJHR XJIOPKOMHJIEKCOB BJIEMEHTOB HEPBOI’O PHflA aAYEKC A-I D. G. BIRNEY, W. E. BLAKE,~. TuZuntu,1968, 15, 557.

R. MEWRUM

IIEPEXOfiHbIX HA CMOJIE and M. E. PEACH,

Pesmnw-IfisyseHa ap;cop6sufl XJIOpKOMIlJIeKCOB nepexoAKbIx 8JIeMeHTOB nepBor0 pffga Ha XeJIaTOO6pa8ylolqetiCMOJIe AayeKc A-I, El o6cvHcaeHbI BO8MORCHble MeXaHH8MbI 8TOti ancoD6uHH. OTHbCEITeJrbiIai agcop6qzw CneAyeT puny Zn(II) >‘Cc$I) = F&III) S CuKl2 > MnKC). @(III) aIICOD6HDOBaJICR B HeaH&Te;fiHOti ‘Mipe, a V(IV) ~ ' II ~ Ni(I1) ' " He - ~cop6sipoBanw2b. a MaKCMManbHaR aAcop6qnfl Zn(II)O6HapyHteHa 1183M COJIRHO~~~ KHCJIOTbI,aOCTaJlbHbIXMeTaJIJIOE+-x8 8M KMCJIOT~I.

Summaries for card indexes

Micro and semi-micro determk tion of organic nitrogen by ase of potassium bromate: MOHAMMADASHRAF, M. A. SJDDIQUIand M. K. BHATTY,Tulantu, 1968,15,559 (West Regional Laboratories, C.S.I.R., Lahore, Pakistan.) Summary-After Kjeldahl digestion of an organic compound, nitrogen is determined by oxidation of the resultant ammonium sulphate with hypobromite produced in situ by the addition of an excess of potassium bromate and bromide in a special flask. The unreacted potassium bromate is determined iodometrically.

The 1: 3 aranimno-&bydroxyqoinoline compound: its composition and thermal conversion into his@-hydroxyquinolinato)dioxoaranimn(VI) A. CORsINIand J. ABRAHAM,Tuluntu, 1968, 15, 562 (Department of Chemistry, McMaster University, Hamilton, Ontario, Canada.) Summary-Evidence is provided to show that in the red compound formed between uranium(VI) and I-hydroxyquinoline, the ligand-touranium ratio is slightly lower than 3: 1, at least when the compound is prepared by a widely accepted procedure. Competition between I-hydroxyquinoline and other ligands such as water or ammonia is probably responsible for the non-stoichiometry. Further, it is shown that a procedure frequently used for the thermal conversion of the red compound into bis(8-hydroxyquinolinato)dioxouranium(VI) yields a compound in which the ligand-to-uranium ratio is less than 2: 1. Conditions which lead to the thermal preparation of the stoichiometric bis compound are described.

Application of electroluminescence techniques to the determination of aromatic hydrocarbons: B. FLEET, G. F. KIRKBRIGHT and C. J. PICKFORD, Tulantu, 1968, 15, 566 (Chemistry Department, Imperial College, London, S.W.7.) Summary-An account is given of the quantitative determination of certain fused-ring aromatic hydrocarbons by means of the electroluminescence induced by application of a small a.c. voltage to inert electrodes placed in a solution of the hydrocarbon in dimethylformamide.

vii

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MEIHPO-M CEMBMMKPOMETOfl OIIPEAEJIEHBSI OPl?AHWIECKOI'O A30TA C kiCIIOJIb30BAHI4EM BPOMATA KAJIHR: MOHAMMADASHRAF,M.A. SIDDIQUI and M. K. BHATIY, Talanta, 1968, 15,559. Peamw-rIowe ~mepKposaKKs opraKmecKor0 coenxfHeHKrr MeTOnOM KbeJIbAaJIH aLtOT OIIpe~eJIHIOTOKElCJIeHKeM o6paaoBaw HOrO CyJSbf$aTaPMMOHMH IlpOHaBeAeHHbIM in siturHIlO6POMHTOM; OH IIOJIy=iaeTCK~ObaBneHneM paCTBOpy Ha6brrKa 6poMaTa Ei 6pohuiAa KamK B CneqnanbKoti Kon6e. HepearspoBaKmt 6poMaTKanm OIIpe~eJlRIOTMO~OMeTpWfeCKtIM MeTOAOM.

COE@HEHME YPAHA(V1) C 8-OKCBXBHOJIBHOM B OTHOIIIEHklH 1:3:EI'OCOCTAB EI KOHBEPCZW B BIW&3-OECCHXI4HOJItiHATO)flIcIOKCMYPAH(VI): A.Coxmr and J.ABRAIWM,Talanta, 1968, 15, 562. PeB@MI+-np&iBeAeHbl LIKCIIepHMeHTaJIbHbIeAaHHhIe IIOKaLUdBLLH)IqHe 9TO 06paaOBaHHOeIi3 ypaKa(VI)E 8-OKCKXSiHOnKHaKpaCHOe CoeAIlHeHMe HMeeT OTHOUIeHHe nmama K ypaHy KeMKoro HEime ¶eM 3: 1 ,IIO KpafiHetiMepeB CJIy~aeIIpIirOTOBJIeHH~COe@fHeHIlR CJIeAyR IIIHpOKO IIpHHRTyH) IIpOqeJQ'py. HeCTeXKOMeTpH'ZeCKOe OTHOIJIeHHe MOZ-KHO WIiTaTb peayJIbTaTOM COpeBHOBaHEIH MemW JlElraH~aMK,TaKElMHKaKBO~aIIJlHatdMEIaK. ~pOMeTOrOl.IOKa~aIiO 9TO YaCTO EClIOJlb8OBaIiH~ IIpOqeAypa AJIR TepMHqeCKOt KOHBepcm KpacHoro CoeAHHeHm B 6nC(8-oKCUXKHonmiaT0) WOKcnypaK(VI) AaeT coeAKHeHne memqee 0TKomeKKe mirawa K ypaHy MeHblneseM2 :I. hmXHbI yCJIOBKKAJfHIIpHrOTOBJIeHS¶R CTOXHOMeTpWJeCKOrO 6EIC-COeAUHeHKR TepM4eCKMM KyTeM.

lTPHMEHElE METOAOB 3JIEECTPOJIIoMkiHECqEHqMH B OHPEJIEJIEHBB APOMATBYECKBX JII‘JIEBOJIOPOJIOB: B. FLEET, G. F. KIRKBRIGHT and C. J.PICKFORD, Talanta, 1968, 15,566. Pe~IoMe-~aCCMOTpeHOKO~kI~eCTBeHHOeO~pe~e~eHEleHeI~OTOp~X apOMaTU¶eCKHX yrJleBo~OpO~OB ~MeIO~HX KOHAeHCEIpOBaHHHble RApa MeTOAOM aneKTpOngMRHeCqeHqHH, BbIEBaHHOti l-IpKKJIaJV+ BaHHeMHe6oJrb~eroKOTeH~Ha~a~epeMeHHOrOTOKaKHHepTHbIME ~~eKTpO~~MH,~OMe~eHHbIMIlBpaCTBOpyrJIeBO~OpO~aB~UMeTH~@OpMaMHAe.

Summaries for card indexes

Spectrotluorimetric determination of microgram amounts of lead: G. F. KIRKBRIGHTand C. G. SAW, Talanta, 1968, 15, 570 (Chemistry Department, Imperial College, London, S.W.7.) Summary-The violet fluorescence at 480 rnp of lead in concentrated hydrochloric acid-potassium chloride solution (excitation maximum 270 rn,u) provides a method for the spectrofluorimetric determination of IO-60 pg of lead. The optimum conditions for the determination have been established, and the effect of 31 foreign ions examined at the 50-fold molar excess level. The interference from iron(IU) and vanadium(V) is eliminated by addition of tin@) chloride, and that of chromium(VI) by treatment with sodium sulphite.

Determination of copper in geological material by neutron activation and gamma-gamma coincidence spectrometry: 0. B. MICHELSENand E. STEINNES,Tulanru, 1968, 15, 574 (Institutt for Atomenergi, Kjeller, Norway.) Summary-The copper content of some geological samples has been determined by thermal neutron activation and subsequent coincidence gamma-spectrometry, taking advantage of the 180” annihilation quanta of %u. By this means the interference of r4Na, which is often the major gamma-activity induced in geological materials, is greatly reduced. The method is precise to about i-5 %, and the error is of the same order. The method should be especially attractive for application to samples with a copper content of 100-1000 ppm.

Kinetic titration with differential thermometric detennlnation of the end-point: I. SAJ~, Talanra, 1968, 15, 578 (Iron and Steel Research Institute, Budapest, Hungary.) Summary-A method has been described for the determination of concentrations below 10-‘&f by applying catalytic reactions and using thermometric end-point determination. A reference solution, identical with the sample solution except for catalyst, is titrated with catalyst solution until the rates of reaction become the same, as shown by a null deflection on a galvanometer connected via bridge circuits to two opposed thermistors placed in the solutions.

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