SCIENTIFIC ABSTRACT BOBROVA, V. N. - BOBROVA, V. N.

• Document Type: CREST
• Collection: Scientific Abstracts
• Document Number (FOIA) /ESDN (CREST): CIA-RDP86-00513R000205630006-9
• Release Decision: RIF
• Original Classification: S
• Document Page Count: 23
• Document Creation Date: November 2, 2016
• Document Release Date: June 9, 2000
• Sequence Number: 6
• Publication Date: December 31, 1967
• Content Type: SCIENCEAB

--130106 VA,V,
AUTHORS. Greboushchikova, V. Is, Bobrovap V. N. 78-1-9/43
TITLE: Co-Precipitation of Lanthaniumq Cerium and Americium With
Potassium Sulfate (Soosazhdeniye lantanap tseriya i ameritsiya
a sernokislym kaliyem). .
PERIODICILt Zhurnal Neorganicheskoy Khimii, 1958, Vol. 3, Hr 1,
PP- 40-45 (USSR)
ABSTRACT: The common crystallization of salts with a formation of
anomalous mixed crystals and the cases of the co-precipitation
with formation of compounds of internal adsorption
(vnutrenne-adoorptionnye soeyedineniya Pl.) are insufficiently
investigated. In the case of the precipitation mentioned in
the title the authors assumed (ref. 1,2)f based on their work,
that the elements mentioned will form compounds of internal
adsorption with K SO . Momentum quantities (impulsnyye
2 4
kolichestva) of La3+, ce3+ and Am3"* are not only captured by
the K2so 4-depqsit forming in the presence of micTocomponents
but also by coarse-orystalline deposits (table 1). Therefore
adsorption and common crystallization were investigated
Card 1/5 separately. The specific surface of the adsorbent was

Co-Precipitation of Lanthanium, Cerium and Americium With
78-t-9/43
Potassium Sulfate
was calculated from the adsorption of'the isotope ion K42.
The authors found that its magnitude with an adsorbent which
is precipitated by quick mixing from a strictly determined
supersaturated solution, remains the same and varies within
the limits of + 5 % (table 2). This is proved by the
straight
dependence of Ehe extent of the adsorption of K42 on the
weight of the-adsorbent (fig. 1). The elements mentioned
form, as we know, with K 2304 difficultly soluble double
salts. Their solubility in the K 2so4 solution was unknown.
The
authors isolated them and also determined their composition
in addition to their solubility (table 3). Experiments with
the adsorption of C92+ and La3+ showed that the absolute
quantity of adaorbed ions increases with the concentrations
of the elements in the solutions. As is seen from fig. 3 and
4 the percentage of adsorbed Ce3+ and La3+ is not changed in
the concentrations of microcomponents investigated. This
proves that the operation is carried out on the straight
part
Card 2/5 of the curve where the adsorpti Ion is far off the
saturation

Co-Preolpitation of Lanthanium, Cerium and Americium With
78-1-9/43
Potassium Sulfate
of the surface with the adsorbed ion. Because of the small
solubility of the double salt of the microcomponent K 2so 4
the whole curve cannot be obtained. Prom table 4 is seen
that this phenomenon must not be attributed to a secondary
exchange adsorption through the influence of foreign ions.
Tables 5-7 give the results of the oo-orystallization of the
salts mentioned in the title according to Khlopin (ref. 4),
namely through the isothermal removal of supersaturation.
In order to explain the mechanism of capturing the
crystallisation coefficients were calculated according
to:
D _x(b and ln ---I- -Xin b where
y (a -_zy a - x b-y
D- the distribation coefficient from Xhlopints theorem; a, b,
correspond to the micro- and macro-oomponents' structure in
the solution into orystallizationj x, y - are corresponding
quantities of micro- and macro-components in the deposit;
Card 3/5 a-xp b-x - the corresponding concentrations of the
latter

Co-Preoipitation of Lanthanium, Cerium and Americium With
78-1-9/43
Potassium Sulfate
in the solution after the crystallization and A-the
distribution coefficient in the lograithmic formula of
Derner-Goskins (Doerner-Hoskine). From the results it
appears that La5+, CO*~ and Am3+ are taken along into the
interior of the K 2s0 4- crystal and there distribute
according to a constant crystallization coefficient. The
values
A 159 17 and 7% 42
Ce La Am
remain oonstant, independent from the quantity of the solid
phase separated. The value of the crystallization coefficient
of the microcomponents remains constant between the
concentrations 1,6.10-6 and 3-10-10 (fig. 3,4)- Each of the
three micro-components distribut6s between the K 2504-deposit
and its concentrated solution according to its own and
constant distribution coefficient (tables 6,7). According
to Khlopin this speaks in favor of a formation of mixed
Card 4/5 crystals (ref- 4). The dependence of the
crystallization

ICHIROVA. V.I.; BRYZGALOVA, R.V.; CHEWAVSKAYA, N.B.; BGROVA, V.N.
-------
Cocrystallization of smaU quantities of substances with cryptalline
precipitatese Radiokhimila 1 nool:3-1-21 '59- (MM 12:4)
(crystallization)
0

2
S/186/60/002/002/017/02

E071/E433

i AUTHOR
b
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rova,
.
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TITMI'
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n the
obl
f th
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pr
agg
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ar
um su
phate

1:~PERIODICAL: Radiokhimiya, 1960,.Vol.2, No,2, PP-243-245

"TEXT: It is well known that alkali metals coprecipitate
with---

i,barium,sulphate, but the views of various
investigators on them,

e,
.nature of the-coprecipitation differ. In order to investigat
:,the
J,

1 -mechanism of the coprecipltailon of potassium with barium
sulphate-~-

it was necessary to establish the possibility of the formation.
a
of

A,double potassium and'barium sulphate in saturated solutions
of,

.,potassium sulphate and to determine its solubility
tinder-these*

i conditions. The experlmpqtal procedure consistdd
of.adding a!

L solution of'barium-nitrateAo a'solution of
potassium sulphate~-~,,,

The salt obtained'was washed-with a
saturated potassium'sulphatet'

.I.solution-in'.0.5 N nitric
9cid. The analysis of -the salt.obtaindd-~

'Was done by two
methods:, extraction of potassium sulphate-fro
M:

ignited salt (at 9000C) with hot distilled'water and by a-wet

a----
;-method in which.the content of barium sulphate-was deiermined
by

.
blank experiment'and.the content of potassium sulphate by,

i
Card 1/2

S/186/60/002/002/017/02LP
.On e problem o' the.ex~stence
E07-1/033
doeferminIng its content:in the mother liquor.. It was f ou nlid
tha t:
41 the precipitated-barium sulphate contained between $~5 td 6.'7%
potassium sulphate which cannot be washed out with water.-,. I It is
assumed that the formation of mixed crystals of. Baso qnd K
S04
.qis4-anc' S
lace.' 'Theaj~ e'of Y.T-r,
takes p
a ckn owl e d gi) d' ThIard -.-vke- 3- tables and 5 referencear,
2.Sovi,64t-blo6.z"
!;and! ''g8
'3,non-So~i 'et-bloc',,_7, Th
0'ference
e..r --to.'ah. English' angua
P, publication reads . as~'f6llo,48,:"L C
%
1~-_G*Wi~lton', and' G6HaWald6nj-:_~J,iAJher* 4*'.Che'm*-Soc"
68'--'~--�',::17.42"f,.!'(3.946
SUBIMITTFID:':,:~~' ".''Julyi
~1959
3
4
e o>-
Card
2~2
it
OU -
T
i f3 f 14 1
i -rl I ~J: I iiI p ~
F .mW

BOBROTA, V. N,
Determination of the solubility of dbuble sulfates of
cerium and
lanth-n- in saturated solutions of potassium sulfate by
the use
of radicactive tracers. Rsdickhimila 2 no.4:500-504 160.
(MIRA 13:9)
(Potassium cerium sulfate)
ONtassium, lanthlinum, sulfate)

0 'Mi'MIKOV"
-----------
I'.,( it o"
O'Iin~onlum co:apounds)

11
of corium and lantYanum vIth poi4ozi= -,Wfatc.
Radioldiimia 3 no,5#377-383 161. (,MV. IW)
(Cerim-. conpounds)
(Lanthanum empounds)
(Potassium sulfate)

)J8 A
S/186 J%03/005/003/022
B073./E485
AUTHORS: Grebenshchikova, Y.I.,__11obrov,_,_VN-
TITLE., Coprecipitation of plutonium and americium with
potassium sulphate
PERIODICAL: Radiokhtmlya, v.3, no.5, 1961, 544-550
TEXT: A Mdy of the copreci3itation of transuranium elements
plutoniumtIV and am6ricium(II ) with potassium sulphate is
described. Radioactive pu239 and Am4?-l and chemically pure and
tw1c4 recrystallized Potassium sulphate were used for the
experiments which were zarrIed out at 20 + 0.14C. The study
consisted in the determination of the crystallization
coefficients
of plutonium and americium and their dependence on:
1) rate of crystallization of the solid phase- 2) presence in
the
solution of other ions (Fe3+ and B13+)- 3) ;imultaneous
presence
An the solution of ions of Pu4+ and Ami+-, 4) concentration of
microoomponents within 1o-5 m - lo-9 m f or plutonium and'
10-7- 10-9 M for americium. Two experimental methods were usedv
isothermal desaturation and partial recrystallization, The
relationships obtained, namely the independence of the-
crystallization coefficients on the proportion of solid'and
liquid
Card 1/2

. 31888
S/186/61/003/005/005/022'
Coprecipitation of plutonium ... E071/9485
phases, rate of orystallization of the aolid phast, the
presenc6 of
other ions and the oonoentration of the two microcompon-exits
within
the investigated range, lead to the conclasion that Ful-111and
Amun)
form with potassium sulphate anomalous milcod'crystals and that
there
is no lower limit of ihiscibility during the formation of mixed
crystals. It was,established'that plutonium adsorbed by the-
precApItated potassium sulphate strongly decreases the rate of
its
recryatallizatton (the rate of recrystallization of
precipitated-
potassium sulphate was found-by adding radioactive sulphur to
the-
solution). The high values of the crystallizaticn c~oefficients
of
plutonium (X *,- 30) and amerioium (X or 42) on their
coprecipitation
with potassium sulphate makes- the use of the latter as-a
carrier
for trana-uranium elements-possible, There are 2 figures,
10 tables. and 8 referenceag 7 Soviet-bloc and I
non-Soviet-blot.
The reference to an English language publieation reada as
follows:
Ref-5g H.Doerner, W.Hoskins, J. Am. Chem. Soz., v.47, 2. 662
(1925).
SUBMITTEDg June 129 2960
2/2

S/186/61/003/005/006/022
E071/E485
AUTHORS-. Grebenshchikova, V.I., Bobrova, V.N.
~-(-III)
TITLE- On the nature of distribution of C-9 between the
precipitate and solution of potassium sulphate
PERIODICAL: Radiokhimiya, v.3. no.5, 1961, 551-554
TEM. It was shown in earlier works (Ref.3: ZhNKh. v.3, 1, 21
(1958)) that on the determination of the crystallization
coefficient of cerium by Isothermal desaturation, the
concentration of cerium in mixed crystals depends on the
concentration of acid. In the present paper, some experimental
results are report d wtiich confirm that the,nature of the-
distribution of Ce
MII) between the precipitate and the solution of
potassium sulphate during isothermal desaturation depends on
the-
ability of the solid'phale)to recrystallize, For this purpose
the distribution of Ce'(I I (radioactive Isotcipe cel44,
containing
less than 1% of active impurities-) between the solid and liquid
phases was determined'at various acid concentrations by
isothermal
desaturation, partial recrystallization of the solid phase and
attainment of equilibrium from 11below". By comparin4 the
obtained,
results of the crystallization coefficients of Ce(IIII in 0.5, 1
Card-1/3

S/186/61/003/005/006/022
On the nature of distributIion ... E071/E485
and 1-5 N HN03 with the data on the velocity of izotopkv
exchange-
of X42 between the precipitate (mixed c.-ystals, obtiined from
supersaturated solutions of K2SO4, containing Ca(III ) and
solution (saturated solution Of K2SO4 in 0-5N HN03) it was
established that the ability of the mixed crystals formed to
recrystallize governs the nature of distribution of Ce(III). if
during the time of precipitation of the mixed crystals the latter
can recrystallize, then a homogeneous distribution of cerium
takes
place; if the precipitate can recrystallize only partially, the
logarithmic distribution with lower valuem of the coefficient of
distribution (X) takes place and if practically no
recrystallizatlon
of the precipitated crystals occurs, then a non-homogeneous
distribution of the microcomponent in the solid'phase with a
maximum value of X takes place. It was also established that the
value of the-coefficient of distribution of Cs(III) between the
precipitate and solution of potassium sulphatt in 0.1, 1 and 1.5
N
nitric acid is independent of the acid concentration (X w-D
a-15).
It follows from the data obtained that with the same
macrocomponent,
the nature of its distribution in a system during isothermal
desataratlon will depend on the nature of the microcomponent, as
the
Card 2/3

s/186/61/003/005/0o6/on
On the nature of distribution E071/9485
recrystallization degree of the precipitate w1.11 depend on the
solubility of the chemical compounft of milarozomponents formed'on
the surface of the arystals. There are-5 tables and-6 referenaes:
5 Soviet-bloo and I non-So7ist-bloc,, The reference to an English
language public;stlon reads as follows. Ref.4i H,,Doerner,
W.Hoskins, J. Ain. Chem. SoCoV Y.47, 675 (1925).
SUBMITTEEF: juiy 14, 196o
Car&- 3/3

s/186/61/003/oo6/ool/olo
E040/EI85
AUTHORS: Grebenshchikova,.V.I., anlAobroval
TITLEz on the form of cerium and lanthanum penetration into
the crystals of potassium sulphate.
PERIODICALs Radiokhimiyal v-3,.no.6, ig6l, 64,5-649
TEXT: Results are reported of an investigation designed to
prove that double salts with the compositions of K5La(SO4)4 and
K5Ce(SO4)4 are formed during Adsorption of Ce3+ and La3+ ions on
the surface of growing K2SO4 crys tals. For this purpose, the
crystallisation coefficients of Ce3+ and La3+ were determined in
the systems of:
*5La(SO4) 4 - Ce 3+ K 2S04 - O-5N HNO3 and K5Ce(SOA.)4 - La 3+.-
*2S04 - O-5N HNO 3 The method of partial recrystallisation
employed in the investigation was described previously (Ref-3a
V.I. Grebenshchikova, R.V. Bryzgalova, ZhNKh, v-3, no.1, 36, 1958).
Use was made of Lal4O and Ce144 radioisotopes. Determination was
also made of the distribution coefficients of ce3+ and La3+
Card 1/2

4
On the form of cerium and lanthanum... s/186/61/0031006/001/010
E040/E185
adsorbed on the surface Of K2SO4 crystals. The proof of the
double salt formation is based on the equality between the
crystallisation coefficient25 of cerium, or lanthanum, of the
reepective double salts and their distribution coefficients on
the surface of potassium sulphate crystals. From the experimental
results obtained it i's concluded that mixed crystals are, in fact,
formed by Ce3+ and La3+ ions with K2SO4 and are co-precipitated in
the form of double salts of K5La(SO4)4 and K5Ce(SO4)4 with K2SO4.
The method used in the investigation can be used for determining
the form'of adsorbed compounds in all cases when the chemical
compound formed on the surface has a composition different from
that of the adsorbent.
There are 7 tables and 4 Soviet-bloc references.
SUBMITTED: july 14, 1960
Card 2/2

GREBENS.HGHIKOVA, BOBROVA, V.N.
Effect of the composition of a complex ion on the value of the
aoofficie# of crystallization. Radiokhimiia 5 no.1:3-$
-RA 16:2)
163,
(Complex compounds)
(Crystallization)

MEENSHCHIKOVA, V.1
Problem of the opprecipitation of plutonium with potassium
sulfate, Radiokhimiia 5 no.l.-9-11 163, (MIRA 16:2)
(Plutonium crystals) (Potassitm sulfate)

VDOVENKOJ, V.M.; IVANOV, LI.; BOBROVA,,V.N.; GAVRILENKO,
'I.S.; IVANOV, A.I.;
SOLOVIYEV? A.L.; RUM5rAMVA:-
Possibility of applying 3-014o-dihydroxyphenyl)alanine
(rOPHA)
as a mediator introducing radioisotopes into melanoma.
Dokl.
AN SSSR 164 no.1:95-98 S 165, (MIRA 18:9)
1. Radiyevyy institut im. V.G. Khlopina i
Voyenno-meditsinskaya
akademiya im. S.M. Kirova. 2. Chlen-korrespondent AN
SSSR. (for
Vdovenko).
C